W97AH6KB datasheet(45/127 Pages) WINBOND

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W97AH6KB / W97AH2KB

Publication Release Date: May 15, 2014

Revision: A01-001

- 45 -

7.4.14.2 Precharge & Auto Precharge Clarification

From

Command

To Command

Minimum Delay between

“From Command” to “To Command”

Unit

Notes

Read

Precharge (to same Bank as Read)

BL/2 + max(2, RU(tRTP/tCK)) - 2

CLK

Precharge All

BL/2 + max(2, RU(tRTP/tCK)) - 2

CLK

BST

(for Reads)

Precharge (to same Bank as Read)

CLK

Precharge All

CLK

Read w/AP

Precharge (to same Bank as Read w/AP)

BL/2 + max(2, RU(tRTP/tCK)) - 2

CLK

1, 2

Precharge All

BL/2 + max(2, RU(tRTP/tCK)) - 2

CLK

Activate (to same Bank as Read w/AP)

BL/2 + max(2, RU(tRTP/tCK)) - 2 + RU(tRPpb/tCK)

CLK

Write or Write w/AP (same bank)

lllegal

CLK

Write or Write w/AP (different bank)

RL + BL/2 + RU(tDQSCKmax/tCK) - WL + 1

CLK

Read or Read w/AP (same bank)

lllegal

CLK

Read or Read w/AP (different bank)

BL/2

CLK

Write

Precharge (to same Bank as Write)

WL + BL/2 + RU(tWR/tCK) + 1

CLK

Precharge All

WL + BL/2 + RU(tWR/tCK) + 1

CLK

BST

(for Writes)

Precharge (to same Bank as Write)

WL + RU(tWR/tCK) + 1

CLK

Precharge All

WL + RU(tWR/tCK) + 1

CLK

Write w/AP

Precharge (to same Bank as Write w/AP)

WL + BL/2+ RU(tWR/tCK) + 1

CLK

Precharge All

WL + BL/2 + RU(tWR/tCK) + 1

CLK

Activate (to same Bank as Write w/AP)

WL + BL/2 + RU(tWR/tCK) + 1 + RU(tRPpb/tCK)

CLK

Write or Write w/AP (same bank)

lllegal

CLK

Write or Write w/AP (different bank)

BL/2

CLK

Read or Read w/AP (same bank)

lllegal

CLK

Read or Read w/AP (different bank)

WL + BL/2 + RU(tWTR/tCK) + 1

CLK

Precharge

Precharge (to same Bank as Precharge)

CLK

Precharge All

CLK

Precharge All

Precharge

CLK

Precharge All

CLK

Notes:

1. For a given bank, the precharge period should be counted from the latest precharge command, either one bank precharge or precharge all,

issued to that bank. The precharge period is satisfied after tRP depending on the latest precharge command issued to that bank.

2. Any command issued during the specified minimum delay time is illegal.

3. After Read with AP, seamless read operations to different banks are supported. After Write with AP, seamless write operations to different banks

are supported. Read w/AP and Write w/AP may not be interrupted or truncated.

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