Write cycle descriptions – Cypress CY7C1245V18 User Manual
Page 12
CY7C1241V18, CY7C1256V18
CY7C1243V18, CY7C1245V18
Document Number: 001-06365 Rev. *D
Page 12 of 28
Write Cycle Descriptions
The write cycle description table for CY7C1245V18 follows.
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]
remain 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]
remain 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]
remain 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]
remain 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.