AS7C33128NTF32B ALSC [Alliance Semiconductor Corporation], AS7C33128NTF32B Datasheet - Page 6

• Manufacturer Part Number: AS7C33128NTF32B
• Description: 3.3V 128K x 32/36 Flowthrough Synchronous SRAM with NTD
• Manufacturer: ALSC [Alliance Semiconductor Corporation]

Synchronous truth table
Key: X = Don’t Care, H = HIGH, L = LOW. BWn = H means all byte write signals (BWa, BWb, BWc, and BWd) are HIGH. BWn = L means one or more byte write signals are
LOW.
Notes:
1 CONTINUE BURST cycles, whether READ or WRITE, use the same control inputs. The type of cycle performed (READ or WRITE) is chosen in the initial BEGIN BURST
2 DUMMY READ and WRITE ABORT cycles can be considered NOPs because the device performs no external operation. A WRITE ABORT means a WRITE command is given,
3 OE may be wired LOW to minimize the number of control signal to the SRAM. The device will automatically turn off the output drivers during a WRITE cycle. OE may be used
4 If an INHIBIT CLOCK command occurs during a READ operation, the DQ bus will remain active (Low-Z). If it occurs during a WRITE cycle, the bus will remain in High-Z. No
5 BWa enables WRITEs to byte “a” (DQa pins); BWb enables WRITEs to byte “b” (DQb pins); BWc enables WRITEs to byte “c” (DQc pins); BWd enables WRITEs to byte “d”
6 All inputs except OE and ZZ must meet setup and hold times around the rising edge (LOW to HIGH) of CLK.
7 Wait states are inserted by setting CEN HIGH.
8 This device contains circuitry that will ensure that the outputs will be in High-Z during power-up.
9 The device incorporates a 2-bit burst counter. Address wraps to the initial address every fourth BURST CYCLE.
10 The address counter is incremented for all CONTINUE BURST cycles.
11 ZZ pin is always Low.
CE0 CE1 CE2 ADV/LD R/W
but no operation is performed.
when the bus turn-on and turn-off times do not meet an application’s requirements.
cycle. A CONINUE DESELECT cycle can only be entered if a DESELECT CYCLE is executed first.
WRITE operations will be performed during the INHIBIT CLOCK cycle.
(DQd pins).
H
X
X
X
X
X
X
X
X
L
L
L
L
4/13/05, v 1.3
X
X
L
X
H
X
H
X
H
X
H
X
X
X
H
X
X
X
X
X
X
X
L
L
L
L
H
H
H
H
H
X
L
L
L
L
L
L
L
[5,6,7,8,9,11]
X
X
X
X
H
X
H
X
X
X
X
L
L
BWn
X
X
X
X
X
X
X
X
H
H
X
L
L
OE CEN
X
X
X
X
H
H
X
X
X
X
X
L
L
Alliance Semiconductor
H
L
L
L
L
L
L
L
L
L
L
L
L
External L to H NOP/DUMMY READ (Begin Burst) High-Z
External L to H
External L to H
External L to H NOP/WRITE ABORT (Begin Burst) High-Z
Address
Current L to H
source
Next
Next
Next
Next
NA
NA
NA
NA
®
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
CLK
DUMMY READ (Continue Burst)
WRITE CYCLE (Continue Burst)
WRITE ABORT (Continue Burst)
CONTINUE DESELECT Cycle
READ Cycle (Continue Burst)
WRITE CYCLE (Begin Burst)
READ Cycle (Begin Burst)
DESELECT Cycle
DESELECT Cycle
DESELECT Cycle
INHIBIT CLOCK
AS7C33128NTF32B/36B
Operation
P. 6 of 18
High-Z
High-Z
High-Z
High-Z
High-Z 1,2,10
High-Z
DQ
Q
Q
D
D
-
1,3,10
1,2,3,
Notes
1,10
2,3
10
2
4
1
3