Cypress CY7C1268V18, CY7C1270V18 manual Write Cycle Descriptions, Comments, Remains unaltered

										CY7C1266V18, CY7C1277V18
										CY7C1268V18, CY7C1270V18
Write Cycle Descriptions
The write cycle description table for CY7C1266V18 and CY7C1268V18 follows.[2, 8]
	BWS	0/	BWS	1/	K					Comments
								K
	NWS0		NWS1
	L		L		L–H			–	During the data portion of a write sequence:
									CY7C1266V18 − both nibbles (D[7:0]) are written into the device.
									CY7C1268V18 − both bytes (D[17:0]) are written into the device.
	L		L		–		L-H		During the data portion of a write sequence:
									CY7C1266V18 − both nibbles (D[7:0]) are written into the device.
									CY7C1268V18 − both bytes (D[17:0]) are written into the device.
	L		H		L–H			–	During the data portion of a write sequence:
									CY7C1266V18 − only the lower nibble (D[3:0]) is written into the device, D[7:4]		remains unaltered.
									CY7C1268V18 − only the lower byte (D[8:0]) is written into the device, D[17:9]		remains unaltered.
	L		H		–		L–H		During the data portion of a write sequence:
									CY7C1266V18 − only the lower nibble (D[3:0]) is written into the device, D[7:4]		remains unaltered.
									CY7C1268V18 − only the lower byte (D[8:0]) is written into the device, D[17:9]		remains unaltered.
	H		L		L–H			–	During the data portion of a write sequence:
									CY7C1266V18 − only the upper nibble (D[7:4]) is written into the device, D[3:0]		remains unaltered.
									CY7C1268V18 − only the upper byte (D[17:9]) is written into the device, D[8:0]		remains unaltered.
	H		L		–		L–H		During the data portion of a write sequence:
									CY7C1266V18 − only the upper nibble (D[7:4]) is written into the device, D[3:0]		remains unaltered.
									CY7C1268V18 − only the upper byte (D[17:9]) is written into the device, D[8:0]		remains unaltered.
	H		H		L–H			–	No data is written into the devices during this portion of a write operation.
	H		H		–		L–H		No data is written into the devices during this portion of a write operation.
Write Cycle Descriptions
The write cycle description table for CY7C1277V18 follows.[2, 8]
	BWS	0	K			K				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.

Note

8.Assumes a write cycle was initiated per the Write Cycle Descriptions tables. NWS0, NWS1, BWS0, BWS1, BWS2, and BWS3 can be altered on different portions of a write cycle, as long as the setup and hold requirements are met.

Document Number: 001-06347 Rev. *D Page 10 of 27

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