CY7C1561V18
CY7C1576V18
CY7C1563V18
CY7C1565V18
Document Number: 001-05384 Rev. *E
Page 10 of 28
Write Cycle Descriptions
The write cycle description table for CY7C1561V18 and CY7C1563V18 follows. [3, 11]
BWS0/
NWS0
BWS1/
NWS1
K
K
Comments
L
L
L–H
–
During the data portion of a write sequence
:
CY7C1561V18
− both nibbles (D[7:0]) are written into the device,
CY7C1563V18
− both bytes (D[17:0]) are written into the device.
L
L
–
L-H During the data portion of a write sequence
:
CY7C1561V18
− both nibbles (D[7:0]) are written into the device,
CY7C1563V18
− both bytes (D[17:0]) are written into the device.
L
H
L–H
–
During the data portion of a write sequence
:
CY7C1561V18
− only the lower nibble (D[3:0]) is written into the device, D[7:4] remains unaltered.
CY7C1563V18
− 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
:
CY7C1561V18
− only the lower nibble (D[3:0]) is written into the device, D[7:4] remains unaltered.
CY7C1563V18
− 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
:
CY7C1561V18
− only the upper nibble (D[7:4]) is written into the device, D[3:0] remains unaltered.
CY7C1563V18
− 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
:
CY7C1561V18
− only the upper nibble (D[7:4]) is written into the device, D[3:0] remains unaltered.
CY7C1563V18
− 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.
Write Cycle Descriptions
The write cycle description table for CY7C1576V18 follows. [3, 11]
BWS0
KK
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
11. Assumes a write cycle was initiated per the Write Cycle Descriptions table. NWS0, NWS1, BWS0, BWS1, BWS2, and BWS3 can be altered on different portions of a
write cycle, as long as the setup and hold requirements are achieved.