W97AH6KB datasheet(19/127 Pages) WINBOND

19 / 127 page

W97AH6KB / W97AH2KB

Publication Release Date: May 15, 2014

Revision: A01-001

- 19 -

7.3

Mode Register Definition

7.3.1

Mode Register Assignment and Definition

Each register is denoted as “R” if it can be read but not written, “W” if it can be written but not read, and “R/W” if it

can be read and written.

Mode Register Read command shall be used to read a register. Mode Register Write command shall be used to

write a register.

7.3.1.1

Mode Register Assignment

MR#

MA[7:0]

Function

Access

OP7

OP6

OP5

OP4

OP3

OP2

OP1

OP0

00H

Device Info.

(RFU)

RZQI

DNVI

DAI

01H

Device Feature 1

nWR (for AP)

02H

Device Feature 2

(RFU)

RL & WL

03H

I/O Config-1

(RFU)

04H

Refresh Rate

TUF

(RFU)

Refresh Rate

05H

Basic Config-1

LPDDR2 Manufacturer ID

06H

Basic Config-2

Revision ID1

07H

Basic Config-3

Revision ID2

08H

Basic Config-4

I/O width

Density

Type

09H

Test Mode

Vendor-Specific Test Mode

0AH

I/O Calibration

Calibration Code

11-15

0BH~0FH

(reserved)

(RFU)

10H

PASR_Bank

Bank Mask

11H

PASR_Seg

Segment Mask

18-19

12H~13H

(Reserved)

(RFU)

20-31

14h–1Fh

Reserved for NVM

20H

DQ Calibration Pattern A

See 7.4.21.2

“DQ Calibration”

33-39

21H~27H

(Do Not Use)

28H

DQ Calibration Pattern B

See 7.4.21.2

“DQ Calibration”

41-47

29H~2FH

(Do Not Use)

48-62

30H~3EH

(Reserved)

(RFU)

3FH

Reset

64-126

40H~7EH

(Reserved)

(RFU)

127

7FH

(Do Not Use)

128-190

80H~BEH

(Reserved for Vendor Use)

(RFU)

191

BFH

(Do Not Use)

192-254

C0H~FEH

(Reserved for Vendor Use)

(RFU)

255

FFH

(Do Not Use)

Notes:

RFU bits shall be set to ‘0’ during Mode Register writes.

RFU bits shall be read as ‘0’ during Mode Register reads.

3. All Mode Registers that are specified as RFU or write-only shall return undefined data when read and DQS shall be toggled.

4. All Mode Registers that are specified as RFU shall not be written.

5. Writes to read-only registers shall have no impact on the functionality of the device.

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