CY7C028V-25AXC Cypress Semiconductor Corp, CY7C028V-25AXC Datasheet - Page 16

• Manufacturer Part Number: CY7C028V-25AXC
• Description: IC,SRAM,64KX16,CMOS,QFP,100PIN,PLASTIC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C028V-25AXC

• Format - Memory: RAM
• Memory Type: SRAM - Dual Port, Asynchronous
• Memory Size: 1M (64K x 16)
• Speed: 25ns
• 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: 428-2103; CY7C028V-25AXC

Table 1. Non-Contending Read/Write
Table 2. Interrupt Operation Example (assumes BUSY
Table 3. Semaphore Operation Example
Document #: 38-06078 Rev. *D
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
45. A
46. If BUSY
47. If BUSY
CE
H
H
H
X
X
X
X
L
L
L
L
L
L
L
L
0L–15L
Function
and A
R
L
R/W
=L, then no change.
=L, then no change.
L
H
H
H
H
H
X
X
X
X
X
Function
L
L
L
R
flag
L
0R–15R
flag
R
flag
flag
,FFFF/FFFE for the CY7C028V/038V.
OE
X
X
X
X
X
H
X
X
X
X
L
L
L
L
L
Inputs
R/W
X
X
X
L
UB
X
H
H
H
X
X
H
X
H
X
L
L
L
L
L
L
CE
I/O
X
X
L
L
L
LB
0
X
H
H
H
X
X
H
X
H
X
L
L
L
L
L
–I/O
1
0
0
1
1
0
1
1
1
0
1
OE
17
X
X
X
L
Left I/O
Left Port
L
SEM
H
H
H
H
H
H
H
H
X
L
L
L
L
L
L
0
High Z
High Z
Data in
High Z
Data in
Data out
High Z
Data out
High Z
Data out
Data out
Data in
Data in
A
–I/O
7FFF
7FFE
0L–14L
L
X
X
1
1
1
0
0
1
1
0
1
1
1
=BUSY
I/O
17
Right
9
–I/O
R
17
=HIGH)
Semaphore free
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
Semaphore free
Left port has semaphore token
Left port has semaphore token
Outputs
INT
H
L
X
X
[46]
[47]
L
High Z
High Z
High Z
Data in
Data in
High Z
Data out
Data out
High Z
Data out
Data out
Data in
Data in
[45]
R/W
I/O
X
X
X
L
0
R
–I/O
CE
8
X
X
L
L
R
CY7C027V/027AV/028V
Deselected: Power-down
Deselected: Power-down
Write to upper byte only
Write to lower byte only
Write to both bytes
Read upper byte only
Read lower byte only
Read both bytes
Outputs disabled
Read data in semaphore flag
Read data in semaphore flag
Write D
Write D
Not allowed
Not allowed
Status
OE
X
L
X
X
Right Port
R
IN0
IN0
CY7C037AV/038V
into semaphore flag
into semaphore flag
Operation
A
7FFE
7FFF
0R–14R
X
X
Page 16 of 22
INT
H
L
[47]
X
X
[46]
R
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