PRELIMINARY
CY7C1516AV18
CY7C1527AV18
CY7C1518AV18
CY7C1520AV18
Document #: 001-06982 Rev. *B
Page 10 of 28
Write Cycle Descriptions (CY7C1516AV18 and CY7C1518AV18)[3, 9]
BWS0, NWS0
BWS1, NWS1
KK
Comments
L
L
L-H
–
During the Data portion of a Write sequence
:
CY7C1516AV18
− both nibbles (D
[7:0]) are written into the device,
CY7C1518AV18
− both bytes (D
[17:0]) are written into the device.
L
L
–
L-H
During the Data portion of a Write sequence
:
CY7C1516AV18
− both nibbles (D
[7:0]) are written into the device,
CY7C1518AV18
− both bytes (D
[17:0]) are written into the device.
L
H
L-H
–
During the Data portion of a Write sequence
:
CY7C1516AV18
− only the lower nibble (D
[3:0]) is written into the device. D[7:4]
will remain unaltered,
CY7C1518AV18
− only the lower byte (D
[8:0]) is written into the device. D[17:9]
will remain unaltered.
L
H
–
L-H
During the Data portion of a Write sequence
:
CY7C1516AV18
− only the lower nibble (D
[3:0]) is written into the device. D[7:4]
will remain unaltered,
CY7C1518AV18
− only the lower byte (D
[8:0]) is written into the device. D[17:9]
will remain unaltered.
H
L
L-H
–
During the Data portion of a Write sequence
:
CY7C1516AV18
− only the upper nibble (D
[7:4]) is written into the device. D[3:0]
will remain unaltered,
CY7C1518AV18
− only the upper byte (D
[17:9]) is written into the device. D[8:0]
will remain unaltered.
H
L
–
L-H
During the Data portion of a Write sequence
:
CY7C1516AV18
− only the upper nibble (D
[7:4]) is written into the device. D[3:0]
will remain unaltered,
CY7C1518AV18
− only the upper byte (D
[17:9]) is written into the device. D[8:0]
will remain unaltered.
H
H
L-H
–
No data is written into the devices during this portion of a Write operation.
H
H
–
L-H
No data is written into the devices during this portion of a Write operation.
Write Cycle Descriptions[3, 9](CY7C1527AV18)
BWS0
KK
Comments
L
L-H
–
During the Data portion of a Write sequence
, the single byte (D
[8:0]) is
written into the device.
L
–
L-H
During the Data portion of a Write sequence
, the single byte (D
[8:0]) is
written into the device.
H
L-H
–
No data is written into the device during this portion of a Write operation.
H
–
L-H
No data is written into the device during this portion of a Write operation.
Note:
9. Assumes a Write cycle was initiated per the Write Port Cycle Description Truth Table. NWS0, NWS1,BWS0, BWS1,BWS2 and BWS3 can be altered on different
portions of a write cycle, as long as the set-up and hold requirements are achieved.
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