Internet Data Sheet

10

Rev.1.80, 2006-11

07092007-3E44-UTNM

HY[B/E]18M512160BF

512-Mbit DDR Mobile-RAM

Functional Description

6) All states and sequences not shown are illegal or reserved.

7) Not bank-specific; requires that all banks are idle and no bursts are in progress.

8) Reads or Writes listed in the Command/Action column include Reads or Writes with Auto Precharge enabled and Reads

or Writes with Auto Precharge disabled.

9) May or may not be bank-specific; if multiple banks are to be precharged, each must be in a valid state for precharging.

10) A WRITE command may be applied after the completion of the Read burst; otherwise, a BURST TERMINATE command

must be used to end the Read burst prior to issuing a WRITE command.

11) Not bank-specific; BURST TERMINATE affects the most recent Read burst, regardless of bank.

12) Requires appropriate DM masking.

Table 7

Current State Bank n - Command to Bank m (different bank)

Current State

CS RAS CAS WE Command / Action

Notes

Any

H

X

X

X

DESELECT (NOP / continue previous operation)

1)2)3)4)5)6)

1) This table applies when CKEn-1 was HIGH and CKEn is HIGH (see Table 5) and after

t

previous state was power-down or self refresh).

2) This table describes alternate bank operation, except where noted, i.e., the current state is for bank n and the commands

shown are those allowed to be issued to bank m (assuming that bank m is in such a state that the given command is

allowable). Exceptions are covered in the notes below.

L

H

H

H

NO OPERATION (NOP / continue previous operation)

1) to 6)

Idle

XXXX

Any command otherwise allowed to bank m

1) to 6)

Row Activating,

Active, or

Precharging

L

L

H

H

ACTIVE (select and activate row)

1) to 6)

L

H

L

H

READ (select column and start Read burst)

1) to 7)

L

H

L

L

WRITE (select column and start Write burst)

1) to 7)

L

L

H

L

PRECHARGE (Deactivate row in bank or banks)

1) to 6)

Read (Auto-

Precharge

Disabled)

L

L

H

H

ACTIVE (select and activate row)

1) to 6)

L

H

L

H

READ (truncate Read and start new Read burst)

1) to 7)

L

H

L

L

WRITE (truncate Read and start Write burst)

1) to 8)

L

L

H

L

PRECHARGE (Deactivate row in bank or banks)

1) to 6)

Write (Auto-

Precharge

Disabled)

L

L

H

H

ACTIVE (select and activate row)

1) to 6)

L

H

L

H

READ (truncate Write and start Read burst)

1) to 7), 9)

L

H

L

L

WRITE (truncate Write and start new Write burst)

1) to 7)

L

L

H

L

PRECHARGE (Deactivate row in bank or banks)

1) to 6)

Read

(with Auto-

Precharge)

L

L

H

H

ACTIVE (select and activate row)

1) to 6)

L

H

L

H

READ (truncate Read and start new Read burst)

1) to 7)

L

H

L

L

WRITE (truncate Read and start Write burst)

1) to 8)

L

L

H

L

PRECHARGE (deactivate row in bank or banks)

1) to 6)

Write

(with Auto-

Precharge)

L

L

H

H

ACTIVE (select and activate row)

1) to 6)

L

H

L

H

READ (truncate Write and start Read burst)

1) to 7)

L

H

L

L

WRITE (truncate Write and start new Write burst)

1) to 7)

L

L

H

L

PRECHARGE (Deactivate row in bank or banks)

1) to 6)