CY7C024-25JI CYPRESS [Cypress Semiconductor], CY7C024-25JI Datasheet - Page 16

• Manufacturer Part Number: CY7C024-25JI
• Description: 4K x 16/18 and 8K x 16/18 Dual-Port Static RAM with SEM, INT, BUSY
• Manufacturer: CYPRESS [Cypress Semiconductor]

Table 1. Non-Contending Read/Write
Table 2. Interrupt Operation Example (assumes BUSY
Document #: 38-06035 Rev. *B
Set Right INT
Reset Right INT
Set Left INT
Reset Left INT
CE
H
X
X
H
X
H
X
L
L
L
L
L
L
L
L
R/W
H
H
H
H
H
X
X
X
X
X
L
L
L
L
R
Flag
L
Function
Flag
Flag
R
Flag
OE
H
X
X
X
X
X
X
X
X
X
L
L
L
L
L
Inputs
UB
X
H
H
H
X
X
H
X
H
X
L
L
L
L
L
LB
H
H
H
H
H
X
L
L
L
L
X
X
X
X
L
R/W
X
X
X
L
SEM
L
H
H
H
H
H
H
H
H
X
L
L
L
L
L
L
CE
X
X
L
L
L
High Z
High Z
High Z
Data In
Data In
High Z
Data Out
Data Out
High Z
Data Out
Data Out
Data In
Data In
I/O
L
Left Port
=BUSY
OE
X
X
X
L
0
–I/O
L
7
R
A
(1)FFE
[2]
(1)FFF
=HIGH)
0L–11L
Outputs
X
X
High Z
High Z
Data In
High Z
Data In
Data Out
High Z
Data Out
High Z
Data Out
Data Out
Data In
Data In
[41]
I/O
INT
H
L
X
X
[42]
8
[43]
–I/O
L
15
R/W
[3]
X
X
X
L
R
Deselected: Power-Down
Deselected: Power-Down
Write to Upper Byte Only
Write to Lower Byte Only
Write to Both Bytes
Read Upper Byte Only
Read Lower Byte Only
Read Both Bytes
Outputs Disabled
Read Data in Semaphore Flag
Read Data in Semaphore Flag
Write D
Write D
Not Allowed
Not Allowed
CE
X
X
L
L
R
Right Port
IN0
IN0
CY7C024/0241
CY7C025/0251
OE
X
X
X
L
into Semaphore Flag
into Semaphore Flag
Operation
R
A
(1)FFE
(1)FFF
0R–11R
X
X
Page 16 of 20
INT
H
L
[43]
X
X
[42]
R