6.42
12
IDT71V2557, IDT71V2559, 128K x 36, 256K x 18, 3.3V Synchronous SRAMs with
ZBT™ Feature, 2.5V I/O, Burst Counter, and Flow-Through Outputs Commercial and Industrial Temperature Ranges
Read Operation
(1)
Burst Write Operation
(1)
Burst Read Operation
(1)
Write Operation
(1)
NOTES:
1. H = High; L = Low; X = Don’t Care; Z = High Impedance.
2. CE2 timing transition is identical to CE1 signal. CE2 timing transition is identical but inverted to the CE1 and CE2 signals.
NOTES:
1. H = High; L = Low; X = Don’t Care; Z = High Impedance.
2. CE2 timing transition is identical to CE1 signal. CE2 timing transition is identical but inverted to the CE1 and CE2 signals.
NOTES:
1. H = High; L = Low; X = Don’t Care; Z = High Impedance.
2. CE2 timing transition is identical to CE1 signal. CE2 timing transition is identical but inverted to the CE1 and CE2 signals.
NOTES:
1. H = High; L = Low; X = Don’t Care; Z = High Impedance.
2. CE2 timing transition is identical to CE1 signal. CE2 timing transition is identical but inverted to the CE1 and CE2 signals.
W
LD
CE
CEN BW
OE
nA
0
H L L L X X X Address and Control meet setup
n+1 X X X XXXLQ
0
Contents of Address A
0
Read Out
4878 tbl 13
W
LD
CE
CEN BW
OE
nA
0
H L L L X X X Address and Control meet setup
n+1 X X H X L X L Q
0
Address A
0
Read Out, Inc. Count
n+2 X X H X L X L Q
0+1
Address A
0+1
Read Out, Inc. Count
n+3 X X H X L X L Q
0+2
Address A
0+2
Read Out, Inc. Count
n+4 X X H X L X L Q
0+3
Address A
0+3
Read Out, Load A
1
n+5 A
1
HL LLXLQ
0
Address A
0
Read Out, Inc. Count
n+6 X X H X L X L Q
1
Address A
1
Read Out, Inc. Count
n+7 A
2
HL LLXLQ
1+1
Address A
1+1
Read Out, Load A
2
4878 tbl 14
Cycle Address R/W ADV/LD
CE
1
CEN BWx OE
I/O Comments
nA
0
L L L L L X X Address and Control meet setup
n+1 X X X X L X X D
0
Write to Address A
0
4878 tbl 15
W
LD
CE
CEN BW
OE
nA
0
L L L L L X X Address and Control meet setup
n+1 X X H X L L X D
0
Address A
0
Write, Inc. Count
n+2 X X H X L L X D
0+1
Address A
0+1
Write, Inc. Count
n+3 X X H X L L X D
0+2
Address A
0+2
Write, Inc. Count
n+4 X X H X L L X D
0+3
Address A
0+3
Write, Load A
1
n+5 A
1
LLLLLXD
0
Address A
0
Write, Inc. Count
n+6 X X H X L L X D
1
Address A
1
Write, Inc. Count
n+7 A
2
LLLLLXD
1+1
Address A
1+1
Write, Load A
2
4878 tbl 16