CY7C057 CYPRESS [Cypress Semiconductor], CY7C057 Datasheet - Page 18

• Manufacturer Part Number: CY7C057
• Description: 3.3V 16K/32K x 36 FLEx36 Asynchronous 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 #: 38-06055 Rev. **
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:
44. A
45. If BUSY
46. If BUSY
CE
H
X
X
H
X
H
X
L
L
L
L
L
0L–14L
Function
R/W
and A
R
L
=L, then no change.
X
X
H
H
X
H
H
X
Function
=L, then no change.
L
L
L
Flag
R
L
0R–14R
Flag
Flag
R
Flag
OE
, 7FFF/7FFE for the CY7C057V.
X
X
X
X
H
X
X
X
L
L
L
L
Inputs
R/W
X
X
X
L
B
0
L
, B
Any L
All H
All H
All H
All L
All L
H/L
H/L
1
CE
X
X
X
X
, B
I/O
X
X
L
L
L
2
0
, B
[3]
–I/O
1
0
0
1
1
0
1
1
1
0
1
3
OE
8
X
X
X
L
Left
Left Port
L
SEM
H
H
H
H
H
H
X
L
L
L
L
L
I/O
0
A
3FFE
3FFF
–I/O
0L–13L
X
X
L
1
1
1
0
0
1
1
0
1
1
1
= BUSY
8
Right
Data Out and High Z
Data In and High Z
R
I/O
Data Out
Data Out
Data Out
Outputs
Data In
Data In
Data In
= HIGH)
High Z
High Z
High Z
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
INT
H
L
0
–I/O
X
X
[45]
[46]
L
35
[3, 44]
R/W
X
X
X
L
R
CE
X
X
L
L
Deselected: Power-Down
Deselected: Power-Down
Write to Selected Bytes Only
Write to All Bytes
Read Selected Bytes Only
Read All Bytes
Outputs Disabled
Read Data in Semaphore Flag
Read Data in Semaphore Flag
Write D
Write D
Not Allowed
R
Status
OE
X
X
X
L
Right Port
IN0
IN0
R
into Semaphore Flag
into Semaphore Flag
Operation
A
3FFE
3FFF
0R–13R
CY7C056V
CY7C057V
X
X
Page 18 of 23
INT
H
L
X
X
[46]
[45]
R