Cypress CY7C1557V18, CY7C1548V18, CY7C1546V18, CY7C1550V18 manual BWS0 BWS1 BWS2 BWS3

CY7C1546V18, CY7C1557V18

CY7C1548V18, CY7C1550V18

Write Cycle Descriptions

The write cycle description table for CY7C1557V18 follows. [3, 9]

BWS0	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.

Write Cycle Descriptions

The write cycle description table for CY7C1550V18 follows. [3, 9]

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: 001-06550 Rev. *E Page 11 of 28

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