Cypress CY7C1277V18 Write cycle description table for CY7C1270V18 follows.2, Into the device

CY7C1266V18, CY7C1277V18

CY7C1268V18, CY7C1270V18

Write Cycle Descriptions

The write cycle description table for CY7C1270V18 follows.[2, 8]

BWS0	BWS1	BWS2	BWS3	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.

Document Number: 001-06347 Rev. *D Page 11 of 27

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