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CY7C1570V18-375BZXC Datasheet(PDF) 11 Page - Cypress Semiconductor

Part # CY7C1570V18-375BZXC
Description  72-Mbit DDR-II SRAM 2-Word Burst Architecture (2.5 Cycle Read Latency)
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Manufacturer  CYPRESS [Cypress Semiconductor]
Direct Link  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

CY7C1570V18-375BZXC Datasheet(HTML) 11 Page - Cypress Semiconductor

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CY7C1566V18, CY7C1577V18
CY7C1568V18, CY7C1570V18
Document Number: 001-06551 Rev. *E
Page 11 of 28
Write Cycle Descriptions
The write cycle description table for CY7C1577V18 follows. [3, 9]
BWS0
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.
Write Cycle Descriptions
The write cycle description table for CY7C1570V18 follows. [3, 9]
BWS0
BWS1
BWS2
BWS3
K
K
Comments
LLLL
L–H
During the data portion of a write sequence, all four bytes (D[35:0]) are written into
the device.
LLLL
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] remains 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] remains 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] 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] 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] 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] remain unaltered.
H
H
H
L
L–H
During the data portion of a write sequence, only the byte (D[35:27]) is written into
the device. D[26:0] remains unaltered.
H
H
H
L
L–H During the data portion of a write sequence, only the byte (D[35:27]) is written into
the device. D[26:0] remains unaltered.
HHHH
L–H
No data is written into the device during this portion of a write operation.
HHHH
L–H No data is written into the device during this portion of a write operation.
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