IS61VPD25636A Datasheet, PDF (10/32 Pages) Integrated Silicon Solution, Inc – 256K x 36, 512K x 18 9 Mb SYNCHRONOUS PIPELINED, DOUBLE CYCLE DESELECT STATIC RAM

IS61VPD25636A, IS61VPD51218A,IS61LPD25636A,IS61LPD51218A
ISSI ^®
TRUTH TABLE^(1-8)
OPERATION
ADDRESS CE CE2 CE2 ZZ ADSP ADSC ADV WRITE OE CLK DQ
Deselect Cycle, Power-Down None
H XX
L
X
L
X
X
X L-H High-Z
Deselect Cycle, Power-Down None
L XL
L
L
X
X
X
X L-H High-Z
Deselect Cycle, Power-Down None
L HX L
L
X
X
X
X L-H High-Z
Deselect Cycle, Power-Down None
L XL
LH
L
X
X
X L-H High-Z
Deselect Cycle, Power-Down None
L HX L H
L
X
X
X L-H High-Z
Snooze Mode, Power-Down None
X XX H X
X
X
X
X X High-Z
Read Cycle, Begin Burst
External L L H L L
X
X
X
L L-H
Q
Read Cycle, Begin Burst
External L L H L L
X
X
X
H L-H High-Z
Write Cycle, Begin Burst
External L L H L H
L
X
L
X L-H
D
Read Cycle, Begin Burst
External L L H L H
L
X
H
L L-H
Q
Read Cycle, Begin Burst
External L L H L H
L
X
H
H L-H High-Z
Read Cycle, Continue Burst Next
X XX L H
H
L
H
L L-H
Q
Read Cycle, Continue Burst Next
X XX L H
H
L
H
H L-H High-Z
Read Cycle, Continue Burst Next
H XX L X
H
L
H
L L-H
Q
Read Cycle, Continue Burst Next
H XX L X
H
L
H
H L-H High-Z
Write Cycle, Continue Burst
Next
X XX L H
H
L
L
X L-H
D
Write Cycle, Continue Burst
Next
H XX L X
H
L
L
X L-H
D
Read Cycle, Suspend Burst Current X X X L H
H
H
H
L L-H
Q
Read Cycle, Suspend Burst Current X X X L H
H
H
H
H L-H High-Z
Read Cycle, Suspend Burst Current H X X L X
H
H
H
L L-H
Q
Read Cycle, Suspend Burst Current H X X L X
H
H
H
H L-H High-Z
Write Cycle, Suspend Burst Current X X X L H
H
H
L
X L-H
D
Write Cycle, Suspend Burst Current H X X L X
H
H
L
X L-H
D
NOTE:
1. X means “Don’t Care.” H means logic HIGH. L means logic LOW.
2. For WRITE, L means one or more byte write enable signals (BWa-d) and BWE are LOW or GW is LOW. WRITE = H for all
BWx, BWE, GW HIGH.
3. BWa enables WRITEs to DQa’s and DQPa. BWb enables WRITEs to DQb’s and DQPb. BWc enables WRITEs to DQc’s and
DQPc. BWd enables WRITEs to DQd’s and DQPd. DQPa and DQPb are available on the x18 version. DQPa-DQPd are
available on the x36 version.
4. All inputs except OE and ZZ must meet setup and hold times around the rising edge (LOW to HIGH) of CLK.
5. Wait states are inserted by suspending burst.
6. For a WRITE operation following a READ operation, OE must be HIGH before the input data setup time and held HIGH during
the input data hold time.
7. This device contains circuitry that will ensure the outputs will be in High-Z during power-up.
8. ADSP LOW always initiates an internal READ at the L-H edge of CLK. A WRITE is performed by setting one or more byte
write enable signals and BWE LOW or GW LOW for the subsequent L-H edge of CLK. See WRITE timing diagram for
clarification.
PARTIAL TRUTH TABLE
Function
GW BWE BWa BWb BWc BWd
Read
Read
Write Byte 1
Write All Bytes
Write All Bytes
H
H
X
X
X
X
H
L
H
H
H
H
H
L
L
H
H
H
H
L
L
L
L
L
L
X
X
X
X
X
10
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. A
05/09/05