CY7C0241 CYPRESS [Cypress Semiconductor], CY7C0241 Datasheet - Page 6
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CY7C0241
Manufacturer Part Number
CY7C0241
Description
4K x 16/18 and 8K x 16/18 Dual-Port Static RAM with SEM, INT, BUSY
Manufacturer
CYPRESS [Cypress Semiconductor]
Datasheet
1.CY7C0241.pdf
(21 pages)
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Document #: 38-06035 Rev. *C
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:
6. A
7. If BUSY
8. If BUSY
0L–12L
R
L
and A
=L, then no change.
=L, then no change.
L
Function
R
Flag
0R–12R
L
Flag
Function
R
Flag
Flag
, 1FFF/1FFE for the CY7C025.
I/O
0
–I/O
Left
1
0
0
1
1
0
1
1
1
0
1
R/W
X
X
X
L
15/17
L
CE
X
X
L
L
I/O
L
0
Right
–I/O
L
Left Port
=BUSY
OE
1
1
1
0
0
1
1
0
1
1
1
X
X
X
L
15/17
L
R
A
(1)FFF
(1)FFE
=HIGH)
0L–11L
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
[6]
INT
H
L
X
X
[7]
[8]
L
R/W
X
X
X
L
R
CE
Status
X
L
X
L
R
Right Port
OE
CY7C024/0241
CY7C025/0251
X
X
X
L
R
A
(1)FFF
(1)FFE
0R–11R
X
X
Page 6 of 21
INT
H
L
X
X
[8]
[7]
R