CY7C144AV CYPRESS [Cypress Semiconductor], CY7C144AV Datasheet - Page 17

• Manufacturer Part Number: CY7C144AV
• Description: 3.3V 8K/16K x 8 Dual-Port Static RAM
• Manufacturer: CYPRESS [Cypress Semiconductor]

Table 1. Non-Contending Read/Write
Table 2. Interrupt Operation Example (assumes BUSY
Table 3. Semaphore Operation Example
Document #: 38-06051 Rev. *E
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. See Functional Description for specific addresses by device part number.
41. If BUSY
42. If BUSY
CE
H
H
H
X
L
L
L
Function
L
R
R/W
= L, then no change.
= L, then no change.
Function
H
H
L
X
X
L
X
R
flag
Inputs
L
flag
R
flag
flag
OE
X
H
X
X
X
L
L
R/W
X
X
L
X
SEM
L
H
X
H
H
L
L
L
CE
I/O
X
X
L
L
High Z
Data out
High Z
Data in
Data out
Data in
L
0
–I/O
1
0
0
1
1
0
1
1
1
0
1
I/O
Outputs
OE
7
Left
X
X
X
L
0
–I/O
L
Left Port
7
I/O
1FFE/3FFE
1FFF/3FFF
0
–I/O
A
Deselected: Power-down
Read data in semaphore flag
I/O lines disabled
Write into semaphore flag
Read
Write
Not allowed
L
0L–13L
1
1
1
0
0
1
1
0
1
1
1
= BUSY
X
X
7
Right
[40]
[40]
R
Semaphore free
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
Semaphore free
Left Port has semaphore token
Left port has semaphore token
= HIGH)
INT
H
L
X
X
[42]
[41]
L
R/W
X
X
X
L
R
Operation
CE
X
X
L
L
R
Status
OE
X
X
X
L
Right Port
R
1FFE/3FFE
1FFF/3FFF
A
CY7C144AV
CY7C006AV
0R–13R
X
X
Page 17 of 21
[40]
[40]
INT
H
L
[41]
X
X
[42]
R
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