CY7C1510V18
CY7C1525V18
CY7C1512V18
CY7C1514V18
Document #: 38-05489 Rev. *D
Page 10 of 27
Write Cycle Descriptions (CY7C1510V18 and CY7C1512V18) [3, 9]
BWS0/NWS0
BWS1/NWS1
K
K
Comments
L
L
L-H
–
During the Data portion of a Write sequence
:
CY7C1510V18
− both nibbles (D
[7:0]) are written into the device,
CY7C1512V18
− both bytes (D
[17:0]) are written into the device.
L
L
–
L-H During the Data portion of a Write sequence
:
CY7C1510V18
− both nibbles (D
[7:0]) are written into the device,
CY7C1512V18
− both bytes (D
[17:0]) are written into the device.
L
H
L-H
–
During the Data portion of a Write sequence
:
CY7C1510V18
− only the lower nibble (D
[3:0]) is written into the device. D[7:4] will
remain unaltered,
CY7C1512V18
− 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
:
CY7C1510V18
− only the lower nibble (D
[3:0]) is written into the device. D[7:4] will
remain unaltered,
CY7C1512V18
− 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
:
CY7C1510V18
− only the upper nibble (D
[7:4]) is written into the device. D[3:0] will
remain unaltered,
CY7C1512V18
− 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
:
CY7C1510V18
− only the upper nibble (D
[7:4]) is written into the device. D[3:0] will
remain unaltered,
CY7C1512V18
− 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.
Write Cycle Descriptions (CY7C1514V18) [3, 9]
BWS0 BWS1 BWS2 BWS3
K
K
Comments
L
L
L
L
L-H
-
During the Data portion of a Write sequence, all four bytes (D[35:0]) are written
into the device.
L
L
L
L
-
L-H During the Data portion of a Write sequence, all four bytes (D[35:0]) are written
into the device.
L
H
H
H
L-H
-
During the Data portion of a Write sequence, only the lower byte (D[8:0]) is written
into the device. D[35:9] will remain unaltered.
L
H
H
H
-
L-H During the Data portion of a Write sequence, only the lower byte (D[8:0]) is written
into the device. D[35:9] will remain unaltered.
H
L
H
H
L-H
-
During the Data portion of a Write sequence, only the byte (D[17:9]) is written into
the device. D[8:0] and D[35:18] will remain unaltered.
H
L
H
H
-
L-H During the Data portion of a Write sequence, only the byte (D[17:9]) is written into
the device. D[8:0] and D[35:18] will remain unaltered.
H
H
L
H
L-H
-
During the Data portion of a Write sequence, only the byte (D[26:18]) is written into
the device. D[17:0] and D[35:27] will remain unaltered.
H
H
L
H
-
L-H During the Data portion of a Write sequence, only the byte (D[26:18]) is written into
the device. D[17:0] and D[35:27] will remain unaltered.
Note:
9. Assumes a Write cycle was initiated per the Write Port Cycle Description Truth Table. NWS0,NWS1,BWS0,BWS1,BWS2 and 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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