Cypress CY7C1150V18, CY7C1148V18 manual Write Cycle Descriptions, Comments, Remains unaltered

CY7C1146V18, CY7C1157V18

CY7C1148V18, CY7C1150V18

Write Cycle Descriptions

The write cycle descriptions of CY7C1146V18 and CY7C1148V18 follows. [3, 9]

BWS0/	BWS1/		K			Comments
					K
NWS0		NWS1
L		L	L – H		–	When the Data portion of a write sequence is active:
						CY7C1146V18 − both nibbles (D[7:0]) are written into the device.
						CY7C1148V18 − both bytes (D[17:0]) are written into the device.
L		L	–	L – H		When the Data portion of a write sequence is active:
						CY7C1146V18 − both nibbles (D[7:0]) are written into the device.
						CY7C1148V18 − both bytes (D[17:0]) are written into the device.
L		H	L – H		–	When the Data portion of a write sequence is active:
						CY7C1146V18 − only the lower nibble (D[3:0]) is written into the device, D[7:4]		remains unaltered.
						CY7C1148V18 − only the lower byte (D[8:0]) is written into the device, D[17:9]	remains unaltered.
L		H	–	L – H		When the Data portion of a write sequence is active:
						CY7C1146V18 − only the lower nibble (D[3:0]) is written into the device, D[7:4]		remains unaltered.
						CY7C1148V18 − only the lower byte (D[8:0]) is written into the device, D[17:9]	remains unaltered.
H		L	L – H		–	When the Data portion of a write sequence is active:
						CY7C1146V18 − only the upper nibble (D[7:4]) is written into the device, D[3:0]		remains unaltered.
						CY7C1148V18 − only the upper byte (D[17:9]) is written into the device, D[8:0]	remains unaltered.
H		L	–	L – H		When the Data portion of a write sequence is active:
						CY7C1146V18 − only the upper nibble (D[7:4]) is written into the device, D[3:0]		remains unaltered.
						CY7C1148V18 − 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 when this portion of a write operation is active.
H		H	–	L – H		No data is written into the devices when this portion of a write operation is active.

The write cycle descriptions of CY7C1146V18 follows. [3, 9]

BWS0	K		K	Comments
L	L – H		–	When the Data portion of a write sequence is active, the single byte (D[8:0]) is written into the device.
L	–	L – H		When the Data portion of a write sequence is active, the single byte (D[8:0]) is written into the device.
H	L – H		–	No data is written into the device when this portion of a write operation is active.
H	–	L – H		No data is written into the device when this portion of a write operation is active.

Note

9.Is based on a Write cycle was initiated in accordance with the Write Cycle Description Truth Table. Alter BWS0, BWS1, BWS2, and BWS3 on different portions of a Write cycle, as long as the setup and hold requirements are achieved.

Document Number: 001-06621 Rev. *D Page 10 of 27

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