Cypress CY7C1241V18, CY7C1243V18, CY7C1245V18, CY7C1256V18 CY7C1241V18, CY7C1256V18 CY7C1243V18, CY7C1245V18

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.[2, 10]
BWS0BWS1BWS2BWS3K K Comments
LLLLL–H–During the data portion of a write sequence, all four bytes (D
[35:0]) are written
into the device.
LLLL–L–HDuring 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.
HHHHL–H–No data is written into the device during this portion of a write operation.
HHHH–L–HNo data is written into the device during this portion of a write operation.
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