CY7C009-15AXC Cypress Semiconductor Corp, CY7C009-15AXC Datasheet - Page 16

• Manufacturer Part Number: CY7C009-15AXC
• Description: IC SRAM 1MBIT 15NS 100LQFP
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C009-15AXC

• Format - Memory: RAM
• Memory Type: SRAM - Dual Port, Asynchronous
• Memory Size: 1M (128K x 8)
• Speed: 15ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 100-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Document #: 38-06041 Rev. *D
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:
43. A
44. If BUSY
45. 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
Flag
R
Flag
, 1FFFF/1FFFE for the CY7C009/019.
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
X
X
L
L
I/O
High Z
Data Out
High Z
Data In
Data Out
Data In
L
0
–I/O
I/O
Outputs
1
1
0
0
1
1
0
1
1
0
1
OE
X
X
X
L
0
8
–I/O
Left
Left Port
L
8
FFFE (or 1FFFE)
FFFF (or 1FFFF)
I/O
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
=BUSY
1
1
1
1
0
0
1
1
0
1
1
8
Right
R
definitely be obtained by one side or the other, but there is no
guarantee which side will control the semaphore.
=HIGH)
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
X
X
[44]
[45]
L
[43]
R/W
X
X
X
L
R
Operation
CE
X
X
L
L
R
OE
Status
X
X
X
L
Right Port
R
FFFF (or 1FFFF)
FFFE (or 1FFFE)
CY7C008/009
CY7C018/019
A
0R–16R
X
X
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INT
H
L
X
X
[45]
[44]
R