CY7C1517V18
CY7C1528V18
CY7C1519V18
CY7C1521V18
Document #: 38-05565 Rev. *E
Page 11 of 28
Write Cycle Descriptions (CY7C1519V18)[3, 9]
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] will remain 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] will 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] will 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] will 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] will 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] will 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] will 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] will remain 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.
Write Cycle Descriptions (CY7C1521V18)[3, 9]
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.