CY7C1422AV18
CY7C1429AV18
CY7C1423AV18
CY7C1424AV18
Document Number: 38-05617 Rev. *C
Page 10 of 28
Write Cycle Descriptions (CY7C1422AV18 and CY7C1429AV18) [2, 8]
BWS0/NWS0
BWS1/NWS1
KK
Comments
L
L
L-H
-
During the Data portion of a Write sequence
:
CY7C1422AV18
− both nibbles (D
[7:0]) are written into the device,
CY7C1423AV18
− both bytes (D
[17:0]) are written into the device.
L
L
-
L-H During the Data portion of a Write sequence
:
CY7C1422AV18
− both nibbles (D
[7:0]) are written into the device,
CY7C1423AV18
− both bytes (D
[17:0]) are written into the device.
L
H
L-H
-
During the Data portion of a Write sequence
:
CY7C1422AV18
− only the lower nibble (D
[3:0]) is written into the device. D[7:4]
will remain unaltered,
CY7C1423AV18
− only the lower byte (D
[8:0]) is written into the device. D[17:9]
will remain unaltered.
L
H
-
L-H During the Data portion of a Write sequence
:
CY7C1422AV18
− only the lower nibble (D
[3:0]) is written into the device. D[7:4]
will remain unaltered,
CY7C1423AV18
− only the lower byte (D
[8:0]) is written into the device. D[17:9]
will remain unaltered.
H
L
L-H
–
During the Data portion of a Write sequence
:
CY7C1422AV18
− only the upper nibble (D
[7:4]) is written into the device. D[3:0]
will remain unaltered,
CY7C1423AV18
− only the upper byte (D
[17:9]) is written into the device. D[8:0]
will remain unaltered.
H
L
–
L-H During the Data portion of a Write sequence
:
CY7C1422AV18
− only the upper nibble (D
[7:4]) is written into the device. D[3:0]
will remain unaltered,
CY7C1423AV18
− only the upper byte (D
[17:9]) is written into the device. D[8:0]
will remain 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.
Note:
8. Assumes a Write cycle was initiated per the Write Cycle Description Truth Table. BWS0, BWS1 in the case of CY7C1422AV18 and CY7C1429AV18 and also
BWS2, BWS3 in the case of CY7C1423AV18 can be altered on different portions of a write cycle, as long as the set-up and hold requirements are achieved.
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