(12) Unlted States Patent
`(10) Patent N0.:
`US 6,243,315 B1
`
`Goodman
`(45) Date of Patent:
`Jun. 5, 2001
`
`USOO6243315B1
`
`(54) COMPUTER MEMORY SYSTEM WITH A
`LOW POWER DOWN MODE
`
`(76)
`
`Inventor:
`
`James B. Goodman, 4750 Pear Ridge
`Dr., Apt 9301, Dallas, TX (US) 75287
`
`( * ) Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 0 days.
`
`(21) Appl. No.: 09/477,920
`.
`Dec. 31! 1999
`Flled:
`(22)
`Int. Cl.7 ....................................................... G11C 7/00
`(51)
`(52) US. Cl.
`.................... 365/222 365/230.03~ 365/229-
`’
`’
`36552’
`365/222 51 63
`""""""""""""""365/52 230’03 ’229’
`’
`'
`’
`
`(58) Field of Search
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`
`........................ 365/222
`
`:jgfg’ggg * 13/32; gearyelinet al.
`4,901,283
`2/1990 Hanbury.
`5,089,993
`2/1992 Neal .
`5,222,044
`6/1993 Tsujimoto .
`5,262,998
`11/1993 Mnich.
`5,784,628
`7/1998 Reneris .
`
`5,798,961
`5,818,299
`5,920,885
`
`8/1998 Heyden .
`10/1998 Tran .
`7/1999 Rao .
`
`>1 cited by examiner
`Primary Examiner—Huan Hoang
`(74) A1101”Hey, Agent, or Fii”m—David Fink
`
`ABSTRACT
`(57)
`A memory system for use in a computer system, includes a
`plurality of volatile solid state memory devices that retain
`information When an electrical power source is applied to
`the memory devices Within a predetermined voltage range,
`and are capable 0f being placed in a self refresh mode. The
`memory deViCCS have reSPeCfiVC address and comml 11““
`and a control device for selectively electrically isolating the
`memory devices from respective address lines and.respec-
`tive control lines so that When the memory dev1ces are
`electrically isolated, any signals received on the respective
`address lines and respective control lines do not reach the
`memory devices. The memory system includes a memory
`access enable control device coupled to the control device
`and to the control lines for determining When the memory
`Sysmm is “0t being accessed’ and for initiating a 10W POW
`mode for the memory system wherein the control dev1ce
`electrically isolates the memory devices and places the
`memory devices in the self refresh mode.
`
`20 Claims, 59 Drawing Sheets
`
`H
`
`
`
`
`DATA BUSS
`
`-—
`
`
`ESSBUSSI
`
`ADDRESS
`
`
`
`
`CONTROL
`CENTER
`
`
`
`
`DDR
`
`A
`
`CONTROL BUSS
`
`ADDRESSBUSSl
`
`CONTROL BUSS
`34
`
`
` mmn\<mb<mo§m§
`
`
`
`
`
`mowomzzbn§§\Dcm2\bAku
`
`
`
`
`
`
`
`Memory Access
`Enable Control
`
`Power Up
`Enable
`Window
`
`RAS and WE Control Lines
`
`
`
` Serial
`
`38
`
`Presence
`
`SPD Control and Data Lines I
`Detect
`
`
`
`36
`
`30
`
`Samsung EX. 1001
`Page 1 0f 68
`
`Samsung Ex. 1001
`Page 1 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 1 0159
`
`US 6,243,315 B1
`
`H
`
`
`
`
`
`
` ADDRESS BUSS
`ADDRESS
`
`
`ADDRESSBUSSI
`&
`CONTROL
`
` CENTER
`
`
`
`
`Power Up
`
`
`
`mmo\<mb<mo§m§
`
`
`
`DATA BUSS
`
`—-
`
`
`
`CONTROL BUSS
`
`34
`
`CONTROL BUSS
`
`
`
`
`Enable
`Window
`
`
`
`mownmzzenEixbom2~hAku
`
`
`
`
`
`
`
`Memory Access
`Enable Control
`
`RAS and WE Control Lines
`
`
`
` Serial
`
`
`Presence
`Detect
`
`38
`
`%
`
`FIG. 1
`
`w
`
`Samsung EX. 1001
`Page 2 0f 68
`
`Samsung Ex. 1001
`Page 2 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 2 0f 59
`
`US 6,243,315 B1
`
`
`a."a.".Naaaaaaaaaafi,5:.E
`
`Mimi
`
`‘4
`
`NGt
`
`Samsung EX. 1001
`Page 3 0f 68
`
`Samsung Ex. 1001
`Page 3 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 3 0f 59
`
`US 6,243,315 B1
`
`3.6V
`
`A[0 9]
`
`“
`
`+
`
`030
`10uf
`
`033
`'01
`
`9
`
`G
`
`DOD
`
`-
`
`"
`
`
`
`.
`m -‘
`~ '
`“iii-f
`
`,
`
`‘
`
`‘
`
`WEL
`CASLA
`HAS
`CA HA
`
`— mm,
`— mm
`—
`'
`a
`.
`4!
`
`HM5165 165L7T-5
`
`9
`
`v
`
`0
`
`FIG. 3.4
`
`Samsung EX. 1001
`Page 4 0f 68
`
`Samsung Ex. 1001
`Page 4 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 4 0f 59
`
`US 6,243,315 B1
`
`3.6V
`
`+ 034
`10Uf
`
`C37
`.01
`
`N
`
`0
`
`0
`
`9
`
`CASLC
`nsc
`CASHC
`
`FIG. 33
`
`Samsung EX. 1001
`Page 5 0f 68
`
`Samsung Ex. 1001
`Page 5 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 5 0f 59
`
`US 6,243,315 B1
`
`3.6V
`
`a N091l
`
`0
`
`+ 038
`10Uf
`
`N
`
`050
`.01
`
`m
`
`
`vss :=
`
`’2
`
`vcco
`
`
`
`
`
`vcco
`'
`
`m0 vss ==
`
`m A”
`0‘”
`,
`
`Vat-g. £5
`88%
`
`
`m- A3
`”04 unfit!
`
`
`
`m '32 88% ‘ ~m A6 ”07 W
`
`
`
`
`
`
`
`”08 mu}
`m A7
`
`
`”09 mail
`m A8
`“070 Kit-.0111"
`Wm. A9
`
`
`W15? 33;;
`.. u?
`
`
`. nu
`5—5- 00’3 W
`
`
`M “0’4 11mm!
`
`0015 M]
`CAS
`m 0016
`'
`/CASH
`
`
`
`36
`
`
`
`HM5165165UT-5
`
`FIG. 30
`
`0
`
`g
`
`9
`
`“A
`
`0
`
`@
`
`0
`
`Samsung EX. 1001
`Page 6 0f 68
`
`Samsung Ex. 1001
`Page 6 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 6 0f 59
`
`US 6,243,315 B1
`
`3.6V
`
`+ 025
`MW
`
`029
`.01
`
`m
`
`96
`
`0
`
`
`
`DD N O)
`
`002is
`'
`-
`
`EEEEa
`Eéééééé
`
`ES
`
`A8
`
`29
`
`W 3
`
`6
`
`HM5165165L7T-5
`
`0
`
`9
`
`6m. 30
`
`Samsung EX. 1001
`Page 7 0f 68
`
`WEL
`CASLB
`RA 8
`CASHB
`
`CD
`
`Samsung Ex. 1001
`Page 7 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 7 0f 59
`
`US 6,243,315 B1
`
`®
`
`® 4
`
`%
`
`,3
`
`(22
`
`a»
`
`VCC
`WEH
`19
`PDMODE
`
`
`CASHB
`18
`CASO-4
`2 7f“ ”’62;
`
`
`
`
`'A B
`,2
`”06
`
`
`;_ .
`.-
`
`
`
`
`I
`a
`15
`
`
`‘
`..
`I6
`[/05
`
`
`
`mm ,8
`Z33
`
`
`_-
`PDUPENL
`1
`[IE
`[/03
`
`
`’3
`
`fig”
`ASHA
`.; .-
`
`U21
`
`20
`
`ATF16V8C
`
`
`
`FIG. 3E
`
`@F‘
`
`Samsung EX. 1001
`Page 8 0f 68
`
`96
`
`$66@
`
`Samsung Ex. 1001
`Page 8 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 8 0f 59
`
`US 6,243,315 B1
`
`CASO-8
`043‘”
`,0
`
`2
`3
`
`PDDEL
`
`PDUPENH
`
`1
`
`®
`
`@®
`
`®
`
`@
`g
`
`@
`
`D 631
`0
`
`PDMODE
`
`I/CLK
`11
`I2
`
`I/OI
`I/0H
`I/OG
`
`
`
`
`I4
`
`[6
`’7
`I8
`I/E
`
`[/05
`”00
`[/00
`[/08
`
`ATF16V80
`
`U26A
`
`“_
`74H01632
`
`FIG. 3F
`
`Samsung EX. 1001
`Page 9 0f 68
`
`Samsung Ex. 1001
`Page 9 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 9 0f 59
`
`US 6,243,315 B1
`
`19
`019
`@
`(23
`
`:E:
`
`629
`
`G9
`
`SA 0-11
`
`3.6V
`
`0
`
`RASO-1
`0Aso-2
`01180-3
`
`ECASO-4
`
`I-
`
`
`
`1
`73
`2
`74
`mm 3
`75
`m 4
`76
`W2 % 79
`.00348 g
`g3
`80
`Winn 9
`3’ _81
`0016
`h1- 1"
`82
`33
`7’
`83 fl
`“—2: ,2
`84
`a4
`0048‘
`85
`0017
`m ’3
`85 11-11;}
`Wm 15
`87
`87
`0018’
`14
`86 "
`‘ H
`o
`16
`88
`88
`0050’
`—003818
`,8
`90 my,
`
`®@®@
`
`(E
`
`J
`'12
`FIG. 36
`
`1&9 ® (29 @
`
`Samsung EX. 1001
`Page 10 0f 68
`
`Samsung Ex. 1001
`Page 10 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 10 0f 59
`
`US 6,243,315 B1
`
`
`‘9
`'19
`
`
`
`‘9
`GB
`
`3.6V
`A
`
`19 A0
`.
`
`20 U23
`
`
`v00
`1
`
`
`I/CLK
`I/0/
`
`
`’2
`”05W
`
`
`PD/13
`I/0F
`
`
`Han:—
`
`
`[/05 my
`W
`EEE-mI“ g
`533m
`
`
`I” ”E
`[/03 12‘
`
`
`
`
`
`
`\m
`
`023
`®
`
`6?
`
`E
`
`A0
`
`.
`PDUPENH
`”A
`
`
`
`‘m w .
`
`.112 [/06
`.‘
`17
`PD/13
`I/0H
`'
`
`
`
`‘1 5g
`A70
`13
`.1” ”00
`
`
`’8
`”00 -EMWIN
`
`I/OB
`
`
`
`CASS/$12
`
` ATF 16V8C
`
`FIG. 3H
`
`,3)
`
`(3
`
`’33
`
`cntclkh
`
`Samsung EX. 1001
`Page 11 0f 68
`
`Samsung Ex. 1001
`Page 11 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 11 0159
`
`US 6,243,315 B1
`
`a
`
`6%
`e)
`:9
`
`«3
`
`ca
`
`6)
`
`cm
`
`w
`w
`ca
`
`69
`
`as)
`
`@
`
`g
`®_@
`a)
`as
`
`FIG. 3!
`
`Samsung EX. 1001
`Page 12 0f 68
`
`Samsung Ex. 1001
`Page 12 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 12 0f 59
`
`US 6,243,315 B1
`
`6
`
`5OO
`
`74HCT161-BU
`
`A B
`
`_ C
`— D
`7
`ENP
`_10 W
`m cm
`
`Samsung EX. 1001
`Page 13 0f 68
`
`Samsung Ex. 1001
`Page 13 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 13 0f 59
`
`US 6,243,315 B1
`
`3.6V
`
`3
`
`®
`
`9&1?!
`
`HAS.” 7
`
`I/CLK
`
`l/OI
`”OH
`
`mm-
`7PDMODE
`
`8@ flVCC
`II
`
`
`
`
`
`ATF 16V80
`
`FIG. 3K @
`
`CM)
`
`Samsung EX. 1001
`Page 14 0f 68
`
`Samsung Ex. 1001
`Page 14 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 14 0f 59
`
`US 6,243,315 B1
`
`@9111? ® (9 (39%
`91m24m:gm9400 2
`96 960053
`97W93w
`11%31_1000055”PM...
`133’
`104
`SA —-J®
`105 _--J
`100
`106
`A11 --
`107 _—-
`133
`109
`349 .I
`110
`
`i
`
`111
`112
`
`
`
`
`
`® 0
`
`0
`
`
`
`1m
`Hm
`32
`\ 544
`2
`33
`h 8A2
`33
`\5-134
`M 33‘.
`.0040
`38
`33
`0041
`40
`
`
`
` j?m00420010 414 42
`
`
`
`35
`
`
`
`BASO- 1
`
`D028
`0060 ‘
`0061 ‘
`D062’
`0053
`
`
`
`1
`1
`132
`134
`136
`138
`
`137
`138
`139
`140
`141
`142
`143
`1—
`
`140
`
`FIG. 3L
`
`®
`
`Samsung EX. 1001
`Page 15 0f 68
`
`Samsung Ex. 1001
`Page 15 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 15 0f 59
`
`US 6,243,315 B1
`
`X24F016
`
`CONN SIMM 144
`
`Samsung EX. 1001
`Page 16 0f 68
`
`Samsung Ex. 1001
`Page 16 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 16 0f 59
`
`US 6,243,315 B1
`
`
`
`74HCIG32
`
`3.6V
`
`
`
`FIG. 3N
`
`Samsung EX. 1001
`Page 17 0f 68
`
`Samsung Ex. 1001
`Page 17 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 17 0f 59
`
`US 6,243,315 B1
`
`74HCT423
`
`Samsung EX. 1001
`Page 18 0f 68
`
`Samsung Ex. 1001
`Page 18 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 18 0f 59
`
`US 6,243,315 B1
`
`111
`
`105
`
`
`DATA BUSS
`
`ADDRESS BUSS
`
`CONTROL
`CENTER
`
`
`A
`
`
`
`
`
`
`
`
`mowomzzoo~<xo§m§Qaqumwm
`
`
`
`
`CONTROLBUSS.-
`
`RASand WE ControlLinesI
`
`
`
`
`
`
`
`
`
`
` DDRESS BUSSilmm0\<mb<m0§m§
`
`CONTROL BUSS I
`
`
`
`
`
`
`
`
`1%
`
`
`
`136
`
`SPD Control and Data Lines
`
`
`Serial
`Presence
`
`
`Detect
`
`
`
`FIG. 4
`
`Samsung EX. 1001
`Page 19 0f 68
`
`Samsung Ex. 1001
`Page 19 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 19 0f 59
`
`US 6,243,315 B1
`
`5V
`
`A 0 9
`
`+030 + 031f
`
`033
`
`N
`
`N
`
`U10
`
`VCCO
`vcco
`
`N0
`NC
`
`VCCO
`A0
`A1
`A2
`A3
`A4
`A5
`A6
`A7
`A8
`A9
`
`002
`003
`004
`005
`006
`007
`008
`009
`0010
`
`32
`’6
`
`M
`
`001
`
`90%
`
`006
`
`10
`
`34
`
`008
`
`0010
`
`iiiiiiiill 001
`
`N
`
`A9
`
`28
`
`EA
`CASLA
`CASHA
`
`0017mm]
`11
`29 y 33;;
`38
`0013
`13
`0014 #390014
`WE
`31
`as 0015 #400015
`30
`/CASH
`NC
`1.;
`
`NC
`
`MT4C1M16E5
`
`FIG. 5A
`
`V
`
`Samsung EX. 1001
`Page 20 0f 68
`
`Samsung Ex. 1001
`Page 20 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 20 0f 59
`
`US 6,243,315 B1
`
`00
`
`O0
`
`I
`
`,__.(:)
`
`+034 + 035f
`mu
`10H
`
`N
`
`037
`.01
`
`N
`
`5V
`
`I
`
`V000
`
`
`
`V000
`.1 ~c
`
`
`
`N0
`
`
`
`m
`001 m
`m A0
`
`
`002 mm]
`m N
`
`
`003 ml
`Hm A?
`004 mm,
`m ‘3
`
`
`m A4
`005
`a
`006
`
`
`33‘;’
`~ fig
`
`
`
`
`
`~ j; 333 mA9
`
`
`00’” W
`A9
`" m 3312’ we”
`
`
`0013
`38
`01
`GE
`29
`13
`WE
`081?,
`39
`0014
`wee
`
`
`$1 -_ —
`
`0016
`_30 HAS
`
`
`/0ASH N0
`NC
`
`
`28
`
`34
`
`0010
`
`
`
`
`‘1’;
`15
`
`”076
`
`MT401M16E5
`
`ME)
`
`/0ASLO
`/HASC
`
`FIG. 50 d“"0
`
`E;
`
`Samsung EX. 1001
`Page 21 0f 68
`
`0
`
`0
`
`9
`
`CASLC
`HASC
`CASHC
`
`Samsung Ex. 1001
`Page 21 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 21 0f 59
`
`US 6,243,315 B1
`
`5V
`
`1‘
`
`1‘
`
`F.
`
`+034 + 0351‘
`10H
`10U
`
`N
`
`C50
`.01
`
`6
`
`2
`3
`
`0017
`DO 18
`DO 19
`
`0022
`
`N 1
`
`1113111111“
`
`10
`
`0024
`
`0026
`l
`
`0028
`0029
`DO 0
`0031
`
`36
`38
`39
`40
`
`12
`15
`
`0
`
`Samsung EX. 1001
`Page 22 0f 68
`
`MT4C 1M 16E5
`
`3G
`
`0 0
`
`Samsung Ex. 1001
`Page 22 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 22 0f 59
`
`US 6,243,315 B1
`
`5V
`
`1‘
`
`h
`
`+026 + 027f
`10U
`10U
`
`N
`
`C29
`
`.01
`
`3
`
`0022
`
`
`
`
`V000
`— No
`
`
`- V000
`"0
`VCCO
`21
`
`
`
`“1 A0
`001
`m A’
`002
`m A2
`003
`
`
`m A3
`004
`m A4
`“05
`Hm A5
`”06
`
`
`m ”3
`”07
`
`
`m Ag
`“08
`"9
`28
`A9
`533:2
`
`1129
`7137/1 0012
`9i
`“073
`M 0074
`
`-A—5
`”015
`U ”A5
`0076
`12
`
`
`ICASH
`NC
`
`
` 15
` NC
`MT4C1M16E5
`
`A
`
`D09
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`/WEA
`CASLB
`RASB
`CASHB
`
`0
`
`fig
`39
`40
`
`191111111
`
`10
`
`024
`
`026
`
`028
`029
`030
`003 1
`
`Ell
`
`FIG. 50
`
`Samsung EX. 1001
`Page 23 0f 68
`
`Samsung Ex. 1001
`Page 23 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 23 0f 59
`
`US 6,243,315 B1
`
`GD
`
`g(
`
`E)
`
`I LK
`
`9 0
`
`9
`
`
`
`
`I
`
`I
`
`/0
`53"
`5%
`g
`
`
`_mi 4
`PD/I3
`l/0F
`
`
`/CASD-1
`g
`
`
`
`
`
`
`”A50"?
`7
`I6
`l/OE
`
`17
`//OD
`
`[8
`”00
`
`[IE
`I/OB
`
`
`
`
`ATF16V8C
`
`0
`
`0 0 ‘19
`
`FIG. 55
`
`0 0 0 0D
`
`9i
`GD
`
`Samsung EX. 1001
`Page 24 0f 68
`
`Samsung Ex. 1001
`Page 24 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 24 0f 59
`
`US 6,243,315 B1
`
`00132
`
`19
`
`1‘?
`76
`
`15
`
`I:
`,2
`
`PDMODE
`CASHD
`RASD
`CASLD
`
`CASLC
`EC
`CASHC
`HAS
`
`[/01
`
`$34;
`I/OF
`
`[/05
`
`//00
`[/00
`1/03
`
`I/E
`
`11
`ED,”
`
`I4
`I5
`I6
`I7
`I8
`
`ATF 1 6V80
`
`FIG. 5F
`
`Samsung EX. 1001
`Page 25 0f 68
`
`0 3
`
`’7
`
`CA 30- 1
`CASO-3
`
`.1
`
`CASO-2
`
`ICASO— 1
`RASO-4
`WE2BANK
`RASO-Z
`PDUPENH
`
`99
`
`@®
`
`Samsung Ex. 1001
`Page 25 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 25 0f 59
`
`US 6,243,315 B1
`
`0
`
`/CASO-1
`
`®
`
`“We; 36'
`/CASO-2
`IIg
`
`I
`
`/CA80-3
`
`/RASO-3
`
`/RASO-4
`A -4
`ME
`
`CID
`
`W
`GD
`43,
`m
`
`m
`
`‘5’ '3’
`
`FIG. 56
`
`Samsung EX. 1001
`Page 26 0f 68
`
`Samsung Ex. 1001
`Page 26 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 26 0f 59
`
`US 6,243,315 B1
`
`
`@
`Q
`
`6)
`(E
`
`(D
`
`'3
`
`w
`a
`w
`a:
`
`«a
`0
`(B
`
`
`
`[/0]
` I/CLK
`l1
`I/0H
`
`[2
`[/06
`
`PD/I3
`I/OF
`
`
`
`
`
`I/OE
`
`[/00
`I7
`
`[/00
`
`
`
`
`
`~— 71“" $3;
`I2
`[/06
`
`19
`
`18
`17
`
`
`
`A7
`
`A8
`PDUPENH
`
`Samsung EX. 1001
`Page 27 0f 68
`
`Samsung Ex. 1001
`Page 27 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 27 0f 59
`
`US 6,243,315 B1
`
`[T[L
`(3—H
`®
`(9
`
`'19
`
`/W?Zfi%§
`
`®
`
`09
`
`m g
`
`@ S
`
`amsung EX. 1001
`Page 28 0f 68
`
`Samsung Ex. 1001
`Page 28 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 28 0f 59
`
`US 6,243,315 B1
`
`® ® (
`
`E w S
`
`amsung EX. 1001
`Page 29 0f 68
`
`Samsung Ex. 1001
`Page 29 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 29 0f 59
`
`US 6,243,315 B1
`
`0
`
`00‘]?
`
`00¢!)
`
`'33
`
`® ® 0
`
`9
`
`® ‘
`
`9
`919
`
`FIG.5K
`
`‘9
`
`‘9
`
`@®®@
`
`Samsung EX. 1001
`Page 30 of 68
`
`Samsung Ex. 1001
`Page 30 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 30 0f 59
`
`US 6,243,315 B1
`
`N
`
`:!~<00o
`
`iiiN‘DCDVO‘JOI-ACOMQ
`‘fifi‘n‘NNNmNmm-kmMN
`
`‘Eel e F
`
`CASO- 1
`/CASO-
`/CASO-4
`/CA30-
`/RASO-1
`HASO-Z
`
`40
`4 1
`4
`43
`44
`45
`
`46
`
`7
`48
`
`IM
`
`‘lN
`
`K
`
`.. ‘.fi‘.
`
`IG. 5L
`
`CONNECTOR SIMM72
`
`Samsung EX. 1001
`Page 31 0f 68
`
`Samsung Ex. 1001
`Page 31 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 31 0f 59
`
`US 6,243,315 B1
`
`6)
`
`fl)
`
`(’1)
`
`a)
`
`PD/I3
`
`I/OM
`
`’8 ”3”"
`
`®
`
`:5;
`rfl-‘rg
`
`If)”;
`
`ATF16V8C
`
`FIG. 5M
`
`7 15
`’6
`”OE
`14
`
`I
`I/E
`
`I00
`I/OB
`
`/EMWIN
`
`.
`
`”E
`
`GE
`
`‘3)
`
`®0
`
`33
`
`Samsung EX. 1001
`Page 32 0f 68
`
`sh
`rasa 2
`
`'
`
`cm
`
`(:9
`
`Samsung Ex. 1001
`Page 32 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 32 0f 59
`
`US 6,243,315 B1
`
`®
`
`GB
`
`(-3)
`
`c9
`
`ea
`
`,3)
`@
`a9
`
`mg
`
`«2»
`-
`
`kg
`3
`:2)
`
`
`
`FIG. 5N
`
`Samsung EX. 1001
`Page 33 of 68
`
`Samsung Ex. 1001
`Page 33 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 33 0f 59
`
`US 6,243,315 B1
`
`mm cm
`
`«a: w
`
`
`
`em
`
`BA1
`
`,
`
`HASO-T g
`—g
`w
`CHA @
`g,
`®
`g,
`
`I
`E:
`
`—I
`_I
`-I
`I --
`I -
`
`
`74HCT161-BU
`
`
` #
`
`_-€3
`
`g?
`
`6 3l 4
`
`FIG. 50
`
`Samsung EX. 1001
`Page 34 0f 68
`
`Samsung Ex. 1001
`Page 34 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 34 0f 59
`
`US 6,243,315 B1
`
`®
`
`®
`
`(59 GE) (9 Q)
`
`a;
`
`,
`
`19 8A0
`
`U17
`CD.” vcc
`
`//CLK
`I/0I
`g‘l- '7
`”0H
`1‘?
`I
`‘ PDMODE
`
`
`
`@i- [2
`[$0610F
`
`
`
`
`
`”05
`2)
`
`
`a,” /7
`I/OD
`
`I/OC
`
`[/03
`
`
`:5‘3'.3C)
`
`l8
`
`4
`
`@ (
`
`$6
`
`I.atel
`
`
`
`N~L~n.!LA
`
`
`!O)i
`
`74HCT423
`
`
`
`
`
`$
`
`3:.
`
`Samsung EX. 1001
`Page 35 of 68
`
`Samsung Ex. 1001
`Page 35 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 35 0f 59
`
`US 6,243,315 B1
`
`3.6V
`
`A09
`
`1
`
`2
`
`+ 08
`10uf
`
`03
`
`.01
`
`V58 50
`
`N[\3
`
`vss "45
`
`vss
`
`39
`
`. 26
`
`2
`
`00
`a
`
`E!
`
`. t
`
`E Ei
`
`EEEEEll!
`
`001
`002
`003
`004
`005
`006
`007
`008
`\
`009 m
`0010
`0011
`A10
`‘3
`0012
`A11
`DE— 0013 m
`1 —
`UWA—ES
`gggg
`38
`
`A8
`
`EL
`045300
`
`i E.
`EEE
`
`0A 301
`
`37
`
`/CASH
`
`HM5165165LTT—5
`
`4
`
`FIG. 614-1
`
`Samsung EX. 1001
`Page 36 of 68
`
`Samsung Ex. 1001
`Page 36 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 36 0f 59
`
`US 6,243,315 B1
`
`3.6V
`
`_
`
`+ C4
`10uf
`
`C5
`.01
`
`m
`
`“
`
`A
`
`N
`
`0
`
`0
`
`
`
`EH
`
`0148304
`
`RASHBO
`
`CASBO5
`
`RASHBO
`
`CASBO7
`
`FIG. 6A-2
`
`II l
`11
`m .-
`‘ m3?
`I
`ll '
`-'
`A8
`29
`mnf
`\
`1
`ma;
`
`W A70
`0011 1:511:22
`
`
`
`as
`6% 3816
`1-
`
`
`13 —
`n
`0014 II'IIEL"
`WE
`
`
`38
`‘t
`'0 o
`% 3353 W
`
`
`
`HM516 55110
`A B
`
`
`
`0 0
`
`Samsung EX. 1001
`Page 37 of 68
`
`0
`
`0
`
`9
`
`Samsung Ex. 1001
`Page 37 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 37 0f 59
`
`US 6,243,315 B1
`
`3.6V
`
`+ 06
`muf
`
`N
`
`C7
`N .01
`
`
`
`0
`
`0
`
`m
`
`FIG. 6.4-3
`
`0
`
`Samsung EX. 1001
`Page 38 of 68
`
`0
`
`0
`
`0 0
`
`0 G 3
`
`Samsung Ex. 1001
`Page 38 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 38 0f 59
`
`US 6,243,315 B1
`
`3.6V
`
`+ 01
`1ouf
`
`02
`.01
`
`N
`
`V000
`
`VSS ::
`
`V000
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`\
`
`EN;
`
`fi
`
`9
`
`0
`
`0
`
`0
`
`WEL
`CASBOZ
`RASLBO
`CASBO3
`
`25
`
`|!||1111111111|11
`
`13
`38
`
`37
`
`FIG. 6.4-4
`
`
`
`VSS ::
` V000
`
`VSS ::
`
`EEEE
`EEEEEE
`
`
`V000 VSS ‘-
`
`A0
`001
`
`A1
`002
`A2
`003
`A3
`004
`A4
`005
`A5
`006
`A6
`007
`A7
`D08
`A8
`009
`A9
`0010
`A10
`0011
`A11
`0012
`AE— 0013
`WE
`0014
`078
`0015
`m 0016
`/0ASH
`
`
`
`
`
`
`
`
`
`
`x 0
`
`~ ‘.
`
`HM5165165LTT-5
`
`Samsung EX. 1001
`Page 39 of 68
`
`Samsung Ex. 1001
`Page 39 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 39 0f 59
`
`US 6,243,315 B1
`
`
`
`FIG. 6A-5
`
`Samsung EX. 1001
`Page 40 0f 68
`
`Samsung Ex. 1001
`Page 40 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 40 0f 59
`
`US 6,243,315 B1
`
`(ID
`
`@
`
`36V
`
`
`
`|
`
`VSS
`
`1
`73
`2
`74
`‘32-] 3
`75
`w: 19
`m 5
`78
`13
`0034
`8
`7
`79
`80
`w: 39 _81
`D016
`hit: 19
`fig
`32
`0048‘
`,2
`84
`a4
`D017
`NJ
`13
`85
`85
`14
`86 —86D049
`0
`15
`87
`87
`D07.‘
`,7 39_90019
`,8
`90 _00051
`GD
`(3) @131 03!
`
`~
`D
`~
`E
`u.-
`@000
`GB
`
`FIG. 6A-6
`
`Samsung EX. 1001
`Page 41 0f 68
`
`Samsung Ex. 1001
`Page 41 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 41 0f 59
`
`US 6,243,315 B1
`
` 6’
`m
`
`wnvsmnr
`
`3.6V
`
`:2
`
`m
`
`10k
`
`1
`
`U7
`
`, I 13
`
`4.
`
`C18
`4,",
`
`-_€
`CA J
`
`‘
`
`'
`
`,
`
`5
`
`_
`
`EMWIN
`
`_
`
`..
`
`m
`
`Samsung EX. 1001
`Page 42 0f 68
`
`74HCT423
`
`67
`
`FIG. 6A-7
`
`3-5V
`
`”2
`10k
`
`N
`
`+ 019
`
`10uf
`
`Samsung Ex. 1001
`Page 42 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 42 0f 59
`
`US 6,243,315 B1
`
`a
`
`8140
`
`A1
`8/12
`8A3
`3A4
`A5
`A6
`
`'
`8/19
`A10
`SA11
`
`U6A
`‘—
`
`A10
`.
`
`A11
`‘
`CAS4
`
`CA 30’
`0/156
`HASHBO
`HASLBO
`023382
`S
`
`IN TART
`
`(i1
`60
`
`(HI
`
`U5
`A10
`1
`.1 8A2
`36v
`A11
`8A1
`. m4
`
`4
`
`Z
`
`1o
`11
`1
`
`15
`
`CASBO1
`CA36
`HASHBO
`HASLBO
`CASBOZ
`CASBO3
`mg”
`
`aAEsLBHgSjEFpEL
`18
`EL
`74HC1G32 m m
`JP1
`35"
`A 30'
`'
`CASBOO
`A1
`22
`
`.
`
`A1
`1
`.
`34:0
`g '
`A
`'
`A3
`A
`4 .
`figs,
`0AS3
`TDO
`g j
`7 _7'1_% ’0’
`8 —I‘i_-Lvl ””5
`9 -
`TCK
`
`HEADER 10
`
`v
`
`A9
`
`A9
`
`xc9572XL
`
`m
`
`010
`
`FIG. 614-8
`
`Samsung EX. 1001
`Page 43 0f 68
`
`Samsung Ex. 1001
`Page 43 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 43 0f 59
`
`US 6,243,315 B1
`
`9
`
`0 0 0
`
`03)
`
`GB
`GD
`
`1m
`
`
`
`64
`5W3 l-i:-
`CASBO7
`
`PF [1:-
`
`“3305
`CAS’ [1-
`CA5?
`3.6V
`
`A0
`A1
`A2
`A3
`
`A5
`
`A
`A'
`A9
`A10
`A11
`
`52,
`50
`49
`
`4‘
`45
`44
`43
`4
`
`40
`39
`8
`
`36
`5
`33’
`
`8A5
`RAE???
`8A7
`
`8A4
`$1410
`“35
`CAS7
`A,
`
`fig
`A8
`
`3A,};
`1’12
`
`G}
`
`3.6V
`
`A
`3/4801
`A7
`
`A4
`AI
`c
`A87
`A7
`
`A5
`A4
`A.
`
`SA11
`A
`E
`
`
`
`FIG. 614-9
`
`Samsung EX. 1001
`Page 44 0f 68
`
`Samsung Ex. 1001
`Page 44 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 44 0f 59
`
`US 6,243,315 B1
`
`
`
`FIG. 6A-10
`
`55480-1
`
`(i)
`
`1m 61 fit
`a,
`
`99
`
`0023
`
`I
`
`@191
`32’
`9
`0020
`93m
`94m
`33W
`gm cm
`133
`100
`0055 I.m
`101_
`mam-II
`133—---J
`
`10 SA8 -=#m- J
`105
`139 _—-I
`1,1,3 ”2
`5m II.
`55=--
`1,4
`115
`A
`116
`117
`118
`119
`120
`121
`122
`123
`124
`125
`15?
`128
`128
`133 I311-
`131
`131
`0028
`132 _130060'
`733
`134
`0061
`
`
`
`0059‘
`
`
`
`
`
`g? 136
`0062’
`
`138
`1 8
`0063
`533
`7’”
`13,3
`‘4
`
`6’
`60
`
`(ED
`
`Samsung EX. 1001
`Page 45 0f 68
`
`Samsung Ex. 1001
`Page 45 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 45 0f 59
`
`US 6,243,315 B1
`
`
`
`CONN SIMM 144
`
`m
`
`at
`
`Go
`
`@ G
`
`D
`
`FIG. 6A-11
`
`Samsung EX. 1001
`Page 46 0f 68
`
`Samsung Ex. 1001
`Page 46 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 46 0f 59
`
`US 6,243,315 B1
`
`6
`
`
`
`SauceENSotmfim.
`
`:m093%8ng
`n”Sm.
`g3—.‘Eél.-
`I3-El;
`
`A
`
`”Sm:.
`
`A
`
`VDo.“$552
`
`ND
`
`Tab.GE
`
`A
`
`
`amt03QEDoommve
`H”\me
`.gI
`G90‘6
`
`E8%
`
`EB
`
`“SSA
`
`imam
`
`“minus
`
`9»:
`
`830
`
`$96
`
`Samsung EX. 1001
`Page 47 0f 68
`
`Samsung Ex. 1001
`Page 47 of 68
`
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 47 0f 59
`
`US 6,243,315 B1
`
`Egg..mans.
`
`
`«$02.I.m9%
`
`mm:
`
`5“Ex
`
`93meQ89me
`
`8m«5
`
`Nnhuduh
`
`
`
`Samsung EX. 1001
`Page 48 0f 68
`
`Samsung Ex. 1001
`Page 48 of 68
`
`
`
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 48 0f 59
`
`US 6,243,315 B1
`
`
`
`«Enosgmommfim.A
`
`u5...EasgagingA
`
`Enos9%8%“va
`
`m:
`
`a.$333%8&5.A.‘.§§
`
`t:
`
`
`
` nUs?.E03Q36SmméA.Eas
`
`6
`
`n5m..a3Us3%8mgA.gng
`
`a:
`
`8mg
`
`
` Emaman03Elm:35.Ae.A
`%Eawt
`minus9%ESARa‘s
`
`
`
`
`‘mmmqaqé'—
`
`666
`
`_§‘
`
`.3823“-—
`.Wfln
`"”SQAA2§Sm
`
`.IaEV“
`mgn03S<.Siglues
`
`
`
`3»:
`
`gmH03
`
`33
`
`Samsung EX. 1001
`Page 49 0f 68
`
`Samsung Ex. 1001
`Page 49 of 68
`
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 49 0f 59
`
`US 6,243,315 B1
`
`15050
`
`mmmtcz
`
`“19.»GE
`
`REHQSQED
`thanmmmlmg:96
`
`Samsung EX. 1001
`Page 50 of 68
`
`Samsung Ex. 1001
`Page 50 of 68
`
`
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 50 0f 59
`
`US 6,243,315 B1
`
`I“Sm.
`
`minus3%...AA.‘amfiilsi
`
`a:
`
`9e6e6
`
`EEDEQ
`
`Ea
`
`I“Sm.“EIQEIQS3%x:A.IAHNassaltos
`
`“3%.AQ1“:
`
`mmlnog3%manqu
`
`mmmnog.‘3m:EH03
`Rings.aSiNQHQS
`
`
`mangeQ59m<usm:A!mmmHQSQ<!QmbS“«EnosA!““EnosA!
`
`
`
`
`$-93$%![lm
`Enos9%:lwfivl
`
`Ikbm~A
`
`
`
`
`
`canoeEgg!“.a:mangeQEHQSQEOINImHVLMI.‘a:minas
`
`mfiwME
`
`
`
`Samsung EX. 1001
`Page 51 0f 68
`
`Samsung Ex. 1001
`Page 51 of 68
`
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 51 0f 59
`
`US 6,243,315 B1
`
`5’ 0.0787 (2 PLCS.)
`
`II ——
`:03
`03
`o
`
`+
`
`n -— n
`U4
`1‘1:
`N
`o
`
`042
`
`+
`
`c:
`D8
`
`U13
`
`Samsung EX. 1001
`Page 52 0f 68
`
`08
`:I
`
`r:
`
`C18
`
`J1
`
`——u21
`034
`
`uzol
`
`
`—-
`
`026
`
`+
`
`II ——
`II
`+
`U18. —-u23 040 W?—
`
`FIG. 78
`
`Samsung Ex. 1001
`Page 52 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 52 0f 59
`
`US 6,243,315 B1
`
`mmnflmflauuwu“manna“munmumnv
`
`r
`
`
`
`25:22:EEEE,
`
`.,,
`
`$4
`
`
`
`gag—=2223::
`
`
`fluEu7AZWmMan71
`
` ZmmEgan:Eggs“
`
`EggZsagas
`
`%%mm
`
`755
`
`r5
`
`5
`
`rr
`
`55
`
`FIG. 7C
`
`FIG. 70
`
`Samsung EX. 1001
`Page 53 of 68
`
`Samsung Ex. 1001
`Page 53 of 68
`
`
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 53 0f 59
`
`US 6,243,315 B1
`
`at:
`
`§Q%
`
`555
`
`5515
`
`.555.
`
`255i
`
`545.!
`
`FIG. 7E
`
`' //
`WWW/”WWW
`
`g%
`
`000°
`///////////////////////
`
`é/W/
`WWW/WW
`
`y//%
`
`W<
`//
`”WWW/WW
`
`FIG. 7F
`
`Samsung EX. 1001
`Page 54 0f 68
`
`Samsung Ex. 1001
`Page 54 of 68
`
`
`
`
`
`
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 54 0f 59
`
`US 6,243,315 B1
`
`
`
`Z?g%%%%%%%%w%flflfifl%%%%%?%%%%%%%%W%%%%%%%%W%fi%%fl%%¢
`/
`0 a
`0
`0
` o W&
`
` %000 °O°°°fiN§§NNNNNK
`
`0
`”/3.
`
`
`
`FIG. 7H
`
`Samsung EX. 1001
`Page 55 of 68
`
`Samsung Ex. 1001
`Page 55 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 55 0f 59
`
`US 6,243,315 B1
`
`
`
`FIG. 7J
`
`Samsung EX. 1001
`Page 56 of 68
`
`Samsung Ex. 1001
`Page 56 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 56 0f 59
`
`US 6,243,315 B1
`
`
`
`FIG. 7L
`
`Samsung EX. 1001
`Page 57 of 68
`
`Samsung Ex. 1001
`Page 57 of 68
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 57 0f 59
`
`US 6,243,315 B1
`
`FIG. 7M
`
`000
`
`8$
`
`8ma0
`
`O
`
`o%owo
`
`700
`//////
`//////////////////////¢
`
`FIG. 7N
`
`Samsung EX. 1001
`Page 58 of 68
`
`Samsung Ex. 1001
`Page 58 of 68
`
`
`
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 58 0f 59
`
`US 6,243,315 B1
`
`a:gum—£523.”:IIIIw%mm
`
`ZWm%g%Egg—“Ea
`
`anaa
`
`“Eu—=2—
`
`an
`
`
`
`Emu—Euan“Eng—EE—
`
`“Egg%sag—E.
`
`Egg.EgEEEE
`
`5111!!
`
`5554
`
`'5555rd.
`
`5515
`.
`
`555'.
`
`755/.
`
`7555.
`
`5515.
`
`:5Ir!
`:‘5‘
`m
`
`2I
`2
`
`5/45};
`
`
`
`rv
`;.75.
`
`25%.
`
`is?
`
`y35.
`
`25.
`
`£551.
`
`5;“?!
`
`555!
`
`595:.
`
`$55!.
`
`5M5}.
`
`Bad!
`
`555%
`
`at!!!
`
`r55}.
`
`5514
`
`5.5.5.!
`
`5556
`
`55!!
`
`(55¢.
`
`555!
`
`555.
`
`FIG. 70
`
`Em...5..“
`wane:
`anE
`
`gaming
`a”.N.mm2
`
`.r5456
`
`...“may“
`
`.trrwnnfl
`
`555'.
`
`vii/#11.
`
`5‘54
`
`FIG. 7P
`
`Samsung EX. 1001
`Page 59 of 68
`
`Samsung Ex. 1001
`Page 59 of 68
`
`
`
`
`
`
`
`

`

`US. Patent
`
`Jun. 5, 2001
`
`Sheet 59 0f 59
`
`US 6,243,315 B1
`
`017
`
`UN
`
`034
`
`II
`
`07
`
`04
`
`E”
`
`[I
`
`:3 NA:
`
`c
`
`S \l
`
`— __
`
`QDo
`l]
`
`
`
`32MEG33vMEMORYMODULE
`
`Samsung EX. 1001
`Page 60 of 68
`
`Samsung Ex. 1001
`Page 60 of 68
`
`

`

`US 6,243,315 B1
`
`1
`COMPUTER MEMORY SYSTEM WITH A
`LOW POWER DOWN MODE
`
`STATEMENT RELATED TO GOVERNMENT
`FUNDED RESEARCH AND DEVELOPMENT
`
`Not Applicable
`
`BACKGROUND
`
`1. Field of the Invention
`
`This invention relates to a computer system including a
`central processing unit (CPU) memory system to retain data
`and to conserve electrical power by utilizing volatile solid
`state memory devices, such as DRAM (Dynamic Random
`Access Memory) semiconductor memory chips capable of
`retaining data, in a low power, self refresh mode whenever
`the memory system is not being accessed by the CPU.
`In addition, the invention relates to a CPU and a memory
`system wherein the retention of data within a volatile solid
`state memory device is maintained in a self refresh mode by
`an internal power supply during times when an external
`power supply voltage falls below a predetermined level.
`2. Prior Art
`
`Current computer systems consume relatively large
`amounts of electrical energy to power the components
`comprising the computer system, thereby making demands
`on batteries used in portable computer systems. Sources of
`this energy consumption are the microprocessor computer
`chip, the volatile memory modules that retain information as
`long as a voltage is applied to them, and usually a hard disk
`drive and CD-ROM drive. The increase in computer chip
`speeds and increase memory module sizes each also increase
`demand for electrical energy. Hard disk drives and CD
`drives which continuously spin whenever the computer
`system is “powered on” are a substantial and constant source
`of battery energy. Successive generations of portable, laptop
`or notebook computers contain computer chips which per-
`form at higher operating speeds, or contain more memory, or
`larger hard disk drive capacity. Each of these additions to the
`computer system increases the demand on the electrical
`power source and shorten the use of battery operation.
`The batteries contain a limited amount of electrical energy
`to supply the electrical demands of the portable, laptop or
`notebook computer system. Larger batteries contain the
`capacity to provide electrical energy for a longer time than
`smaller batteries. However, as battery size increases to
`compensate for the increased electrical demands the weight
`of the portable, laptop or notebook computer also increases.
`Computer designers must continually trade off electrical
`power capacity against overall computer system weight.
`Power Management methods and tools are designed in
`current portable, laptop and notebook computers to conserve
`battery power. Such methods and tools include, operating
`the computer chips on lower voltage than the standard 5 volt
`logic (operation on a reduced voltage also reduces the heat
`generated in portable,
`laptop or notebook computer
`systems), placing the computer chip in suspended or deep
`sleep mode when the computer chip detects no activity for
`a predetermined period of time, and powering down the hard
`disk drive after a user defined time period.
`These methods and tools, while increasing battery life
`also have disadvantages. The methods and tools are essen-
`tially time based. Under such a time based system access to
`the peripheral devices, such as hard disk drives, could be
`denied as the peripheral device could itself be in a power
`down, or power savings mode. Further, setting the disk drive
`
`2
`power down time period to too small a value can actually
`decrease battery life as the need to access the disk drive
`requires the disk drive be returned to a fully spinning
`condition. This return to a fully spinning condition can
`sometimes require more power than would be required to
`maintain the disk drive in the full spin operational mode.
`Computer systems contain different forms of semicon-
`ductor memory used to store programs and data. The most
`common of these memories are Programmable Read-Only
`Memory (PROM), EPROM (Erasable PROM), EEPROM
`(Electrically Erasable PROM), FLASH and volatile solid
`state memory devices which maintain information only
`when a predetermined voltage is applied to them typically
`used for Random Access Memory (RAM). PROM memory
`is a memory where the contents, stored as a series of logical
`highs and lows(1 and 0) are permanently stored and
`unchangeable. When power is removed from the computer
`system, PROM memory retain the series of logical highs and
`lows stored within it. Similarly, EPROMs and EEPROMs,
`permanently retain the data stored with their memory, but
`have the capability to erase the logical highs and lows and
`replace the memory contents with new and different data
`patterns. Typically the EPROMs use Ultra-violet light as an
`eraser means, and EEPROMs uses electrical means as the
`eraser.
`
`FLASH memory is similar to EEPROM memory. In each
`of these memory types, the storage of the data or programs
`in these memories is permanent, whether power is applied to
`the computer system or not. Such memory is referred to as
`non-volatile memory. As an example, Computer BIOS
`(Basic Input/Output Sequence) programs are stored in some
`form of PROM; where the older computer systems had
`BIOS program stored in EPROM, more current computer
`systems retain the BIOS in FLASH to allow for reprogram-
`mability. When power is applied, the program stored in the
`BIOS begins the sequence to load the full operational
`program (such as Windows 3.11 or Windows95/NT) into the
`computer memory. PROM memory is used when size and
`power consumption are not critical factors,
`the program
`instructions do not change often and the program instruc-
`tions are required to remain independent of the input power
`state.
`
`Unlike PROM, Random Access Memory, for example
`DRAM or any solid state volatile memory device that
`maintains information when a voltage is applied to it, is used
`in a computer system when the program instruction changes
`often and the need for data retention is generally for a short
`period of time. Application programs, such as WORDPER-
`FECT (TRADEMARK), Microsoft Word (TRADEMARK),
`and Lotus 123 (TRADEMARK) are programs loaded into
`computer RAM when they are to be executed and remain in
`RAM through the period of execution. Examples commonly
`used RAM memory include devices Static (SRAM) and
`Dynamic (DRAM). Both SRAM and DRAM retain the
`contents of their memory states when electrical power is
`provided and maintained on the devices. Whenever electri-
`cal power is removed from the devices, the memory contents
`of the device is lost and irretrievable. Memory systems that
`lose their data when electrical power is removed are called
`“volatile memories” in the art. When electrical power is
`intentionally removed, such as in an orderly shutdown of the
`computer system, there is no intent to retain RAM contents.
`But when the electrical power is unintentionally and unex-
`pectedly removed, such as in cases of power outages, the
`lose of the contents of the RAM could be devastating.
`To protect the contents of the RAM memory under such
`unexpected conditions, it has become a common practice to
`
`5
`
`10
`
`15
`
`20
`
`25
`
`30
`
`35
`
`40
`
`45
`
`50
`
`55
`
`60
`
`65
`
`Samsung Ex. 1001
`Page 61 of 68
`
`Samsung Ex. 1001
`Page 61 of 68
`
`

`

`US 6,243,315 B1
`
`3
`
`use an external Uninterrupted Power Supply(UPS) to main-
`tain electrical power to the computer system during the such
`unexpected power outages. The UPS is positioned between
`the source of the input electrical power and the computer
`system. The UPS provides sufficient power to enable a user
`to save the contents of a program in operation and complete
`the current application program. When main electrical
`power is restored, the user can restart the application pro-
`gram and begin program operation again. Without the pro-
`tection of UPS, the data entered and application program in
`RAM would be irretrievably lost.
`One embodiment of the present invention is a memory
`system including solid state volatile memory devices
`capable of maintaining information when a voltage is
`applied to the devices, for example DRAM or the like. The
`invention prevents the loss of data due to unexpected power
`outages and also prevents errant control and address signals
`to the memory devices by monitoring the input electrical
`power source to the memory devices for acceptable
`conditions, and electrically isolating the memory devices
`from signals received on the control lines and address lines
`and switching to an alternate internal electrical power
`source, typically a battery, whenever the input power source
`is unacceptable.
`The memory system maintains the integrity of the data
`retained by the memory devices by isolating the devices
`from the external power source, control lines and address
`lines and placing the memory devices into a power down
`self-refresh mode which will maintain the data using a
`minimum of electrical power.
`The prior art US. Pat. No. 5,798,961 discloses a SIMM
`non-volatile memory module having a volatile memory
`array, a battery circuit, a charging circuit and a control
`circuit. The control circuit in connection with the battery
`circuit monitors the external power supply from the SIMMi
`VCC line.
`If the external power source falls below a
`predetermined voltage then the battery circuit maintains the
`integrity of the data by supplying power to the volatile
`memory array. The data retained by the memory module is
`susceptible to errant control signals and address signals that
`may appear on the control and address lines during times of
`unstable power in the system.
`
`SUMMARY OF THE INVENTION
`
`invention, a memory
`In accordance with the present
`system for use in a computer system including a solid state
`volatile memory device that is capable of retaining infor-
`mation when a voltage is applied to it and capable of being
`placed in a self refresh mode is placed in a low power
`standby mode when the memory system is not receiving
`requests for access. The low power mode utilizes signifi-
`cantly less electrical current than when the memory device
`is in the operating mode or powered up mode. According to
`the present invention a control device is interposed electri-
`cally between the memory devices and a CPU. The control
`device senses CPU accesses of the memory devices and
`conditions the memory devices to an operating mode con-
`dition prior to the allowing access to the information con-
`tained therein. Whenever the control device senses the
`
`termination of a memory cycle, the control device places the
`solid state memory devices in a low power standby mode.
`The present invention further provides for reducing the
`overall electrical power requirement of portable, laptop or
`notebook computers by utilizing another embodiment of
`memory system in a hard disk emulation mode, thereby
`removing the need to maintain electrical power to the hard
`
`10
`
`15
`
`20
`
`25
`
`30
`
`35
`
`40
`
`45
`
`50
`
`55
`
`60
`
`65
`
`4
`disk drive of the computer system during those periods when
`the hard disk is not needed for computer program operation.
`Such reduced electrical power usage substantially increases
`the effective time the battery for the computer system can
`provide electrical power to maintain operations. By using a
`hard disk simulation for memory accesses instead of access-
`ing the hard drive for the portable or laptop computer,
`significant savings in electrical power are achieved and it is
`possible to use smaller main batteries to reduce the over
`weight of the computer.
`In yet another embodiment according to the invention, a
`memory system for use in a computer system the memory
`system comprising a plurality of volatile solid state memory
`devices that retain information when an electrical power
`source is a