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CY7C1141V18, CY7C1156V18
CY7C1143V18, CY7C1145V18
Document Number: 001-06583 Rev. *D Page 11 of 28
Write Cycle Descriptions
The write cycle descriptions of CY7C1141V18 and CY7C1143V18 follows.
[2, 10]
BWS
0
/
NWS
0
BWS
1
/
NWS
1
K
K
Comments
L L L–H – During the data portion of a write sequence:
CY7C1141V18 − both nibbles (D
[7:0]
) are written into the device.
CY7C1143V18 − both bytes (D
[17:0]
) are written into the device.
L L – L-H During the data portion of a write sequence:
CY7C1141V18 − both nibbles (D
[7:0]
) are written into the device.
CY7C1143V18 − both bytes (D
[17:0]
) are written into the device.
L H L–H – During the data portion of a write sequence:
CY7C1141V18 − only the lower nibble (D
[3:0]
) is written into the device, D
[7:4]
remains unaltered.
CY7C1143V18 − 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:
CY7C1141V18 − only the lower nibble (D
[3:0]
) is written into the device, D
[7:4]
remains unaltered.
CY7C1143V18 − 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:
CY7C1141V18 − only the upper nibble (D
[7:4]
) is written into the device, D
[3:0]
remains unaltered.
CY7C1143V18 − 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:
CY7C1141V18 − only the upper nibble (D
[7:4]
) is written into the device, D
[3:0]
remains unaltered.
CY7C1143V18 − 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.
The write cycle descriptions of CY7C1156V18 follows.
[2, 10]
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
10.Is based on a Write cycle was initiated in accordance with the Write Cycle Description Truth Table. Alter NWS
0
, NWS
1
,
BWS
0
, BWS
1
, BWS
2
,
and BWS
3
on different
portions of a Write cycle, as long as the setup and hold requirements are achieved.
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