CY7C024/0241
CY7C025/0251
Table 3. Semaphore Operation Example
I/O0–I/O15/17
I/O0–I/O15/17
Function
Left
Right
Status
No action
1
1
1
1
0
0
1
1
0
1
1
1
Semaphore free
Left Port has semaphore token
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
0
0
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
1
1
0
1
1
Right port has semaphore token
Semaphore free
1
0
Left port has semaphore token
Semaphore free
1
Ordering Information
4K x16 Dual-Port SRAM
Speed
Package
Operating
(ns)
Ordering Code
CY7C024–15AC
Name
A100
J83
Package Type
100-Pin Thin Quad Flat Pack
Range
15
Commercial
CY7C024–15JC
CY7C024–25AC
CY7C024–25JC
CY7C024–25AI
CY7C024–25JI
CY7C024–35AC
CY7C024–35JC
CY7C024–35AI
CY7C024–35JI
CY7C024–55AC
CY7C024–55JC
CY7C024–55AI
CY7C024–55JI
84-Lead Plastic Leaded Chip Carrier
100-Pin Thin Quad Flat Pack
25
35
55
A100
J83
Commercial
Industrial
84-Lead Plastic Leaded Chip Carrier
100-Pin Thin Quad Flat Pack
A100
J83
84-Lead Plastic Leaded Chip Carrier
100-Pin Thin Quad Flat Pack
A100
J83
Commercial
Industrial
84-Lead Plastic Leaded Chip Carrier
100-Pin Thin Quad Flat Pack
A100
J83
84-Lead Plastic Leaded Chip Carrier
100-Pin Thin Quad Flat Pack
A100
J83
Commercial
Industrial
84-Lead Plastic Leaded Chip Carrier
100-Pin Thin Quad Flat Pack
A100
J83
84-Lead Plastic Leaded Chip Carrier
Notes:
41.
42. If BUSY =L, then no change.
A
and A
, 1FFF/1FFE for the CY7C025.
0L–12L
0R–12R
R
43. If BUSY =L, then no change.
L
Document #: 38-06035 Rev. *B
Page 17 of 20
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