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CY7C1266V18, CY7C1277V18
CY7C1268V18, CY7C1270V18
Document Number: 001-06347 Rev. *D Page 10 of 27
Write Cycle Descriptions
The write cycle description table for CY7C1266V18 and CY7C1268V18 follows.
[2, 8]
BWS
0
/
NWS
0
BWS
1
/
NWS
1
K
K
Comments
L L L–H – During the data portion of a write sequence:
CY7C1266V18 − both nibbles (D
[7:0]
) are written into the device.
CY7C1268V18 − both bytes (D
[17:0]
) are written into the device.
L L – L-H During the data portion of a write sequence:
CY7C1266V18 − both nibbles (D
[7:0]
) are written into the device.
CY7C1268V18 − both bytes (D
[17:0]
) are written into the device.
L H L–H – During the data portion of a write sequence:
CY7C1266V18 − only the lower nibble (D
[3:0]
) is written into the device, D
[7:4]
remains unaltered.
CY7C1268V18 − only the lower byte (D
[8:0]
) is written into the device, D
[17:9]
remains unaltered.
L H – L–H During the data portion of a write sequence:
CY7C1266V18 − only the lower nibble (D
[3:0]
) is written into the device, D
[7:4]
remains unaltered.
CY7C1268V18 − only the lower byte (D
[8:0]
) is written into the device, D
[17:9]
remains unaltered.
H L L–H – During the data portion of a write sequence:
CY7C1266V18 − only the upper nibble (D
[7:4]
) is written into the device, D
[3:0]
remains unaltered.
CY7C1268V18 − only the upper byte (D
[17:9]
) is written into the device, D
[8:0]
remains unaltered.
H L – L–H During the data portion of a write sequence:
CY7C1266V18 − only the upper nibble (D
[7:4]
) is written into the device, D
[3:0]
remains unaltered.
CY7C1268V18 − only the upper byte (D
[17:9]
) is written into the device, D
[8:0]
remains 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
The write cycle description table for CY7C1277V18 follows.
[2, 8]
BWS
0
K K 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
8. Assumes a write cycle was initiated per the Write Cycle Descriptions tables. NWS
0
, NWS
1
, BWS
0
, BWS
1
, BWS
2
, and BWS
3
can be altered on different portions
of a write cycle, as long as the setup and hold requirements are met.
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