CY7C009V-15AXC Cypress Semiconductor Corp, CY7C009V-15AXC Datasheet - Page 18

• Manufacturer Part Number: CY7C009V-15AXC
• Description: CY7C009V-15AXC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C009V-15AXC

• Format - Memory: RAM
• Memory Type: SRAM - Dual Port, Asynchronous
• Memory Size: 1M (128K x 8)
• Speed: 15ns
• Interface: Parallel
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 100-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 428-1786

When reading a semaphore, all data lines output the semaphore
value. The read value is latched in an output 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
Document Number: 38-06044 Rev. *E
Notes
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
44. A
45. If BUSY
46. If BUSY
CE
H
H
H
X
L
L
L
0L–16L
Function
R
L
and A
R/W
= L, then no change.
= L, then no change.
H
H
X
X
X
Function
L
L
R
Flag
Inputs
0R–16R
L
Flag
R
Flag
Flag
OE
, 1FFFF/1FFFE for the CY7C009V/19V.
X
H
X
X
X
L
L
R/W
X
X
X
L
SEM
L
H
X
H
H
L
L
L
CE
X
X
I/O
L
L
High Z
Data out
High Z
Data in
Data out
Data in
L
0
–I/O
Outputs
I/O
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
0L–16L
Deselected: Power-down
Read data in semaphore flag
I/O lines disabled
Write into semaphore flag
Read
Write
Not allowed
–I/O
X
X
L
1
1
1
0
0
1
1
0
1
1
1
8
SPS
= BUSY
Right
of each other, the semaphore will 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)
[45]
X
X
[46]
L
R/W
[44]
X
X
X
L
R
Operation
CE
X
L
L
X
R
OE
Status
X
X
X
L
Right Port
R
FFFE (or 1FFFE)
FFFF (or 1FFFF)
CY7C008V/009V
CY7C018V/019V
A
0R–16R
X
X
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INT
H
L
[46]
[45]
X
X
R
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