KM44H16230BB-FY 데이터 시트보기 (PDF) - Samsung

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KM44H16230BB-FY

DDR SDRAM Specification Version 0.61

Samsung 

128Mb DDR SDRAM

Target

QFC timming on Write operation with tDQSSmax

QFC on writes is enabled as soon as possible after the clock edge of write command and disabled as soon

as possible after the last DQS-in low going edge.

BL = 2

0

1

2

3

4

5

6

7

8

CK

CK

Command

DQS@tDQSSmax

Write

DQS’ @tDQSSmax

QFC

Hi-Z tQCSW

Dout 0 Dout 1

tQCHW

Figure 27. : QFC timing on write operation with tDQSSmax

QFC Timming on Write operation with tDQSSmin

QFC on writes is enabled as soon as possible after the clock edge of write command and disabled

as soon as possible after the last DQS-in low going edge.

BL = 2

CK

0

1

2

3

4

5

6

7

8

CK

Command

DQS@tDQSSmin

Write

DQS’ @tDQSSmin

QFC

Dout 0 Dout 1

Hi-Z tQCSW

tQCHW

Figure 28. : QFC timing on write operation with tDQSSmax

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REV. 0.61 August 9. '99

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