CY7C019V-25AC Cypress Semiconductor Corp, CY7C019V-25AC Datasheet - Page 15

• Manufacturer Part Number: CY7C019V-25AC
• Description: SRAM Chip Async Dual 3.3V 1.125M-Bit 128K x 9-Bit 25ns 100-Pin TQFP
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C019V-25AC

• Package: 100TQFP
• Timing Type: Asynchronous
• Density: 1.125 Mb
• Typical Operating Supply Voltage: 3.3 V
• Address Bus Width: 17 Bit
• Number Of I/o Lines: 9 Bit
• Number Of Ports: 2
• Number Of Words: 128K

Document #: 38-06044 Rev. *C
register to prevent the semaphore from changing state during
a write from the other port. If both ports attempt to access the
semaphore within t
Table 1. Non-Contending Read/Write
Table 2. Interrupt Operation Example (assumes BUSY
Table 3. Semaphore Operation Example
Notes:
40. A
41. If BUSY
42. If BUSY
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
CE
H
H
H
X
L
L
L
0L–16L
Function
R
L
and A
= L, then no change.
R/W
= L, then no change.
H
H
X
X
X
Function
L
L
0R–16R
R
Flag
Inputs
L
Flag
R
Flag
Flag
, 1FFFF/1FFFE for the CY7C009V/19V.
OE
SPS
H
X
X
X
X
L
L
of each other, the semaphore will
R/W
X
X
X
L
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
I/O
Outputs
1
0
0
1
1
0
1
1
1
0
1
OE
X
X
X
L
8
0
–I/O
Left Port
L
Left I/O
8
FFFE (or 1FFFE)
FFFF (or 1FFFF)
A
0
Deselected: Power-Down
Read Data in Semaphore Flag
I/O Lines Disabled
Write into Semaphore Flag
Read
Write
Not Allowed
0L–16L
–I/O
X
X
L
1
1
1
0
0
1
1
0
1
1
1
= BUSY
8
Right
definitely be obtained by one side or the other, but there is no
guarantee which side will control the semaphore.
R
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
= HIGH)
[41]
X
X
[42]
L
R/W
[40]
X
X
X
L
R
Operation
CE
X
X
L
L
R
OE
Status
X
X
X
L
Right Port
R
CY7C008V/009V
CY7C018V/019V
FFFE (or 1FFFE)
FFFF (or 1FFFF)
A
0R–16R
X
X
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INT
H
L
[42]
X
X
[41]
R