CY7C1266V18
CY7C1277V18
CY7C1268V18
CY7C1270V18
Document Number: 001-06347 Rev. *C
Page 11 of 27
Write Cycle Descriptions
The write cycle description table for CY7C1270V18 follows.[2, 8]
BWS0 BWS1 BWS2 BWS3
KK
Comments
LLLL
L-H
–
During the data portion of a write sequence, all four bytes (D[35:0]) are written
into the device.
LLLL
–
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.
HHHH
L-H
–
No data is written into the device during this portion of a write operation.
HHHH
–
L-H No data is written into the device during this portion of a write operation.
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