Datasheet
CY7C1525KV18
CY7C1512KV18
CY7C1514KV18
Document Number: 001-00436 Rev. *R Page 12 of 34
Write Cycle Descriptions
The write cycle description table for CY7C1525KV18 follow.
[9, 10]
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.
Write Cycle Descriptions
The write cycle description table for CY7C1514KV18 follow.
[9, 11]
BWS
0
BWS
1
BWS
2
BWS
3
K K Comments
L L L L L–H – During the data portion of a write sequence, all four bytes (D
[35:0]
) are written into
the device.
L L L L – L–H During the data portion of a write sequence, all four bytes (D
[35:0]
) are written into
the device.
L H H H L–H – During the data portion of a write sequence, only the lower byte (D
[8:0]
) is written
into the device. D
[35:9]
remains unaltered.
L H H H – L–H During the data portion of a write sequence, only the lower byte (D
[8:0]
) is written
into the device. D
[35:9]
remains unaltered.
H L H H L–H – During the data portion of a write sequence, only the byte (D
[17:9]
) is written into the
device. D
[8:0]
and D
[35:18]
remains unaltered.
H L H H – L–H During the data portion of a write sequence, only the byte (D
[17:9]
) is written into the
device. D
[8:0]
and D
[35:18]
remains unaltered.
H H L H L–H – During the data portion of a write sequence, only the byte (D
[26:18]
) is written into
the device. D
[17:0]
and D
[35:27]
remains unaltered.
H H L H – L–H During the data portion of a write sequence, only the byte (D
[26:18]
) is written into
the device. D
[17:0]
and D
[35:27]
remains unaltered.
H H H L L–H – During the data portion of a write sequence, only the byte (D
[35:27]
) is written into
the device. D
[26:0]
remains unaltered.
H H H L – L–H During the data portion of a write sequence, only the byte (D
[35:27]
) is written into
the device. D
[26:0]
remains unaltered.
H H H H L–H – No data is written into the device during this portion of a write operation.
H H H H – L–H No data is written into the device during this portion of a write operation.
Notes
9. X = “Don't Care,” H = Logic HIGH, L = Logic LOW,
represents rising edge.
10. Is based on a write cycle that was initiated in accordance with the Write Cycle Descriptions table. 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 achieved.
11. Is based on a write cycle that was initiated in accordance with the Write Cycle Descriptions table. 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 achieved.