CY7C025-25JI Cypress Semiconductor Corp, CY7C025-25JI Datasheet - Page 16

• Manufacturer Part Number: CY7C025-25JI
• Description: SRAM Chip Async Dual 5V 128K-Bit 8K x 16 25ns 84-Pin PLCC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C025-25JI

• Package: 84PLCC
• Timing Type: Asynchronous
• Density: 128 Kb
• Typical Operating Supply Voltage: 5 V
• Address Bus Width: 12 Bit
• Number Of I/o Lines: 16 Bit
• Number Of Ports: 2
• Number Of Words: 8K

Table 1. Non-Contending Read/Write
Table 2. Interrupt Operation Example (assumes BUSY
Table 3. Semaphore Operation Example
Set Right INT
Reset Right INT
Set Left INT
Reset Left INT
No action
Left port writes 0 to semaphore
Right port writes 0 to semaphore
Left port writes 1 to semaphore
Left port writes 0 to semaphore
Right port writes 1 to semaphore
Left port writes 1 to semaphore
Right port writes 0 to semaphore
Right port writes 1 to semaphore
Left port writes 0 to semaphore
Left port writes 1 to semaphore
Notes:
40. A
41. If BUSY
42. If BUSY
CE
H
H
H
X
X
X
X
L
L
L
L
L
L
L
L
0L–12L
R/W
and A
R
L
=L, then no change.
H
H
H
H
H
X
X
X
X
X
=L, then no change.
L
L
L
L
Function
R
Flag
L
0R–12R
Function
Flag
Flag
R
Flag
OE
, 1FFF/1FFE for the CY7C025.
X
X
X
X
X
H
X
X
X
X
L
L
L
L
L
Inputs
UB
H
H
H
H
H
X
X
X
X
X
L
L
L
L
L
I/O
LB
X
H
H
H
X
X
H
X
H
X
L
L
L
L
L
0
–I/O
Left
1
0
0
1
1
0
1
1
1
0
1
R/W
L
X
X
X
15/17
SEM
L
H
H
H
H
H
H
H
H
X
L
L
L
L
L
L
CE
L
X
X
L
I/O
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
0
Right
I/O
L
–I/O
Left Port
=BUSY
OE
1
1
1
0
0
1
1
0
1
1
1
X
X
X
L
0
–I/O
15/17
16
L
7
R
A
(1)FFE
[2]
(1)FFF
=HIGH)
0L–11L
Outputs
Semaphore free
Left Port has semaphore token
No change. Right side has no write access to semaphore.
Right port obtains semaphore token
No change. Left port has no write access to semaphore
Left port obtains semaphore token
Semaphore free
Right port has semaphore token
Semaphore free
Left port has semaphore token
Semaphore free
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
[40]
I/O
INT
H
L
X
X
8
[41]
[42]
–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
Status
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
INT
H
L
[42]
X
X
[41]
R