Cypress CY7C1168V18 Manual De Usuario
CY7C1166V18, CY7C1177V18
CY7C1168V18, CY7C1170V18
CY7C1168V18, CY7C1170V18
Document Number: 001-06620 Rev. *D
Page 10 of 27
Write Cycle Descriptions
The write cycle descriptions of CY7C1166V18 and CY7C1168V18 follows.
BWS
0
/
NWS
0
BWS
1
/
NWS
1
K
K
Comments
L
L
L–H
–
During the Data portion of a write sequence
:
CY7C1166V18
− both nibbles (D
[7:0]
) are written into the device.
CY7C1168V18
− both bytes (D
[17:0]
) are written into the device.
L
L
–
L-H During the Data portion of a write sequence
:
CY7C1166V18
− both nibbles (D
[7:0]
) are written into the device.
CY7C1168V18
− both bytes (D
[17:0]
) are written into the device.
L
H
L–H
–
During the Data portion of a write sequence
:
CY7C1166V18
− only the lower nibble (D
[3:0]
) is written into the device, D
[7:4]
remains unaltered.
CY7C1168V18
− 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
:
CY7C1166V18
− only the lower nibble (D
[3:0]
) is written into the device, D
[7:4]
remains unaltered.
CY7C1168V18
− 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
:
CY7C1166V18
− only the upper nibble (D
[7:4]
) is written into the device, D
[3:0]
remains unaltered.
CY7C1168V18
− 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
:
CY7C1166V18
− only the upper nibble (D
[7:4]
) is written into the device, D
[3:0]
remains unaltered.
CY7C1168V18
− 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 CY7C1177V18 follows.
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
8. 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.