CY7C1146V18
CY7C1157V18
CY7C1148V18
CY7C1150V18
Document Number: 001-06621 Rev. *C
Page 10 of 27
Write Cycle Descriptions
The write cycle descriptions of CY7C1146V18 and CY7C1148V18 follows. [3, 9]
BWS0/
NWS0
BWS1/
NWS1
K
K
Comments
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
KK
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.
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