CY7C1317BV18
CY7C1917BV18
CY7C1319BV18
CY7C1321BV18
Document Number: 38-05622 Rev. *C
Page 10 of 28
Write Cycle Descriptions(CY7C1317BV18 and CY7C1319BV18)[2, 8]
BWS0,NWS0 BWS1,NWS1 KK
Comments
L
L
L-H
-
During the Data portion of a Write sequence
:
CY7C1317BV18
− both nibbles (D
[7:0]) are written into the device,
CY7C1319BV18
− both bytes (D
[17:0]) are written into the device.
L
L
-
L-H During the Data portion of a Write sequence
:
CY7C1317BV18
− both nibbles (D
[7:0]) are written into the device,
CY7C1319BV18
− both bytes (D
[17:0]) are written into the device.
L
H
L-H
-
During the Data portion of a Write sequence
:
CY7C1317BV18
− only the lower nibble (D
[3:0]) is written into the device. D[7:4] will remain
unaltered,
CY7C1319BV18
− 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
:
CY7C1317BV18
− only the lower nibble (D
[3:0]) is written into the device. D[7:4] will remain
unaltered,
CY7C1319BV18
− 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
:
CY7C1317BV18
− only the upper nibble (D
[7:4]) is written into the device. D[3:0] will
remain unaltered,
CY7C1319BV18
− 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
:
CY7C1317BV18
− only the upper nibble (D
[7:4]) is written into the device. D[3:0] will
remain unaltered,
CY7C1319BV18
− 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. NWS0, NWS1,BWS0, BWS1,BWS2, BWS3 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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