CY7C138-15JXC Cypress Semiconductor Corp, CY7C138-15JXC Datasheet - Page 13

• Manufacturer Part Number: CY7C138-15JXC
• Description: IC SRAM 32KBIT 15NS 68PLCC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C138-15JXC

• Format - Memory: RAM
• Memory Type: SRAM - Dual Port, Asynchronous
• Memory Size: 32K (4K x 8)
• Speed: 15ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 68-PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Document #: 38-06037 Rev. *B
Table 1. Non-Contending Read/Write
Table 2. Interrupt Operation Example (assumes BUSY
Table 3. Semaphore Operation Example
Set Left INT
Reset Left INT
Set Right INT
Reset Right INT
No action
Left port writes 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
CE
H
H
X
H
L
L
L
R/W
H
H
X
X
L
X
Function
Function
Inputs
OE
X
H
X
X
X
L
L
SEM
H
X
H
H
L
L
L
I/O
R/W
X
X
X
L
0-7/8
High Z
Data Out
High Z
Data In
Data Out
Data In
1
0
0
1
1
0
1
1
1
0
1
Left
L
CE
=BUSY
X
X
L
L
Outputs
Left Port
I/O
I/O
R
OE
0-7/8
0-7/8
X
X
X
L
=HIGH)
1
1
1
0
0
1
1
0
1
1
1
Right
A
FFE
FFF
0-11
X
X
Semaphore free
Left port obtains semaphore
Right side is denied access
Right port is granted access to semaphore
No change. Left port is denied access
Left port obtains semaphore
No port accessing semaphore address
Right port obtains semaphore
No port accessing semaphore
Left port obtains semaphore
No port accessing semaphore
INT
Power-Down
Read Data in Semaphore
I/O Lines Disabled
Write to Semaphore
Read
Write
Illegal Condition
H
X
X
L
R/W
X
X
X
L
CE
X
X
Operation
L
L
Status
Right Port
OE
X
X
X
L
CY7C138
CY7C139
Page 13 of 16
A
FFE
FFF
0-11
X
X
INT
H
X
X
L
[+] Feedback