NT5DS64M4AT NT5DS64M4AW

NT5DS32M8AT NT5DS32M8AW

256Mb DDR333/300 SDRAM

Preliminary

10/01

14

NANYA TECHNOLOGY CORP. reserves the right to change Products and Specifications without notice.

Truth Table 4: Current State Bank n - Command to Bank m (Different bank)

(Part 1 of 2)

Current State

CS

RAS

CAS

WE

Command

Action

Notes

Any

H

X

X

X

Deselect

NOP/continue previous operation

1-6

L

H

H

H

No Operation

NOP/continue previous operation

1-6

Idle

X

X

X

X

Any Command Otherwise

Allowed to Bank m

1-6

Row Activating,

Active, or

Precharging

L

L

H

H

Active

Select and activate row

1-6

L

H

L

H

Read

Select column and start Read burst

1-7

L

H

L

L

Write

Select column and start Write burst

1-7

L

L

H

L

Precharge

1-6

Read

(Auto Precharge

Disabled)

L

L

H

H

Active

Select and activate row

1-6

L

H

L

H

Read

Select column and start new Read burst

1-7

L

L

H

L

Precharge

1-6

Write

(Auto Precharge

Disabled)

L

L

H

H

Active

Select and activate row

1-6

L

H

L

H

Read

Select column and start Read burst

1-8

L

H

L

L

Write

Select column and start new Write burst

1-7

L

L

H

L

Precharge

1-6

met (if the previous state was 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 cov-

ered in the notes below.

3. Current state definitions:

Idle:

Row Active:

in progress.

Read:

A Read burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated.

Write:

A Write burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated.

Read with Auto Precharge Enabled: See note 10.

Write with Auto Precharge Enabled: See note 10.

4. Auto Refresh and Mode Register Set commands may only be issued when all banks are idle.

5. A Burst Terminate command cannot be issued to another bank; it applies to the bank represented by the current state only.

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

7. 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.

8. Requires appropriate DM masking.

9. A Write command may be applied after the completion of data output.

10. The Read with Auto Precharge enabled or Write with Auto Precharge enabled states can each be broken into two parts: the access

period and the precharge period. For Read with Auto Precharge, the precharge period is defined as if the same burst was executed with

Auto Precharge disabled and then followed with the earliest possible Precharge command that still accesses all of the data in the burst.

of the Read with Auto Precharge Enabled or Write with Auto Precharge Enabled states, Active, Precharge, Read, and Write commands

to the other bank may be applied; during the access period, only Active and Precharge commands to the other bank may be applied. In

either case, all other related limitations apply (e.g. contention between Read data and Write data must be avoided).