gvt7164b18 Cypress Semiconductor Corporation., gvt7164b18 Datasheet - Page 5

• Manufacturer Part Number: gvt7164b18
• Description: 64k X 18 Synchronous Burst Sram Semiconductor
• Manufacturer: Cypress Semiconductor Corporation.

Truth Table
Partial Truth Table for Read/Write
Notes:
Document #: 38-05204 Rev. *A
2.
3.
4.
5.
6.
7.
8.
Deselected Cycle, Power Down
Deselected Cycle, Power Down
Deselected Cycle, Power Down
Deselected Cycle, Power Down
Deselected Cycle, Power Down
Read Cycle, Begin Burst
Read Cycle, Begin Burst
Write Cycle, Begin Burst
Read Cycle, Begin Burst
Read Cycle, Begin Burst
Read Cycle, Continue Burst
Read Cycle, Continue Burst
Read Cycle, Continue Burst
Read Cycle, Continue Burst
Write Cycle, Continue Burst
Write Cycle, Continue Burst
Read Cycle, Suspend Burst
Read Cycle, Suspend Burst
Read Cycle, Suspend Burst
Read Cycle, Suspend Burst
Write Cycle, Suspend Burst
Write Cycle, Suspend Burst
Read
Read
Write one byte
Write all bytes
Write all bytes
X means “don’t care.” H means logic HIGH. L means logic LOW. WRITE = L means [BWE + WEL*WEH]*GW equals LOW. WRITE = H means
[BWE + WEL*WEH]*GW equals HIGH.
WEL enables Write to DQ1–DQ8 and DQP1. WEH enables Write to DQ9–DQ16 and DQP2.
All inputs except OE must meet set-up and hold times around the rising edge (LOW to HIGH) of CLK.
Suspending burst generates wait cycle.
For a Write operation following a Read operation, OE must be HIGH before the input data required setup time plus High-Z time for OE and staying HIGH
throughout the input data hold time.
This device contains circuitry that will ensure the outputs will be in High-Z during power-up.
ADSP LOW along with chip being selected always initiates a Read cycle at the L–H edge of CLK. A Write cycle can be performed by setting WRITE LOW for
the CLK L–H edge of the subsequent wait cycle. Refer to Write timing diagram for clarification.
Operation
[2, 3, 4, 5, 6, 7, 8]
Function
Address
External
External
External
External
External
Current
Current
Current
Current
Current
Current
Used
None
None
None
None
None
Next
Next
Next
Next
Next
Next
CE CE2 CE2 ADSP
H
X
X
H
H
X
H
X
X
H
H
X
H
L
L
L
L
L
L
L
L
L
X
X
H
X
H
X
X
X
X
X
X
X
X
X
X
X
X
L
L
L
L
L
GW
H
H
H
H
L
X
X
X
H
H
H
H
H
X
X
X
X
X
X
X
X
X
X
X
X
L
L
H
H
X
H
H
H
H
H
H
H
X
X
X
H
H
X
X
X
L
L
L
L
ADSC
BWE
H
H
H
H
H
H
H
H
H
H
H
H
X
X
X
X
H
L
L
L
L
L
L
L
L
L
X
ADV
X
X
X
X
X
X
X
X
X
X
H
H
H
H
H
H
L
L
L
L
L
L
WRITE
WEH
X
X
X
X
X
X
X
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
H
X
X
L
L
OE
X
X
X
X
X
H
X
H
H
H
X
X
H
H
X
X
L
L
L
L
L
L
GVT7164B18
CY7C1297A/
CLK
L–H
L–H
L–H
L–H
L–H
L–H
L–H
L–H
L–H
L–H
L–H
L–H
L–H
L–H
L–H
L–H
L–H
L–H
L–H
L–H
L–H
L–H
Page 5 of 13
WEL
H
H
X
X
L
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
DQ
Q
Q
Q
Q
Q
Q
D
D
D
D
D