IS43LD16640C datasheet(13/142 Pages) ISSI

13 / 142 page

IS43/46LD16640C

IS43/46LD32320C

Integrated Silicon Solution, Inc. — www.issi.com

Rev. C

07/02/2021

® Long-term Support

World Class Quality

Mode Register Assignment

MR#MA <7:0>FunctionAccessOP7 OP6OP5 OP4OP3 OP2OP1 OP0

20-31

18H-1FH

Reserved

Mode Register Assignment (Reset Command & RFU part)

MR#

MA <7:0>

Function

Access

OP7 OP6 OP5 OP4 OP3 OP2 OP1

OP0

20H

DQ calibration pattern A

See “Data Calibration Pattern Description”

33-39

21H-27H

(Do Not Use)

28H

DQ calibration pattern B

See “Data Calibration Pattern Description”

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:

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

2.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.See Vendor Device Datasheets for details on Vendor Specific Mode Registers.

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

Notes:

1. If RZQI is supported, it will be set upon completion of the MRW ZQ initialization calibration.

2. If ZQ is connected to V

DDCA, to set default calibration, OP[4:3] must be set to 01. If ZQ is not connected to VDDCA, either OP[4:3]

= 01 or OP[4:3] = 10 could indicate a ZQ-pin assembly error. It is recommended that the assembly error be corrected.

3. In the case of a possible assembly error (either OP[4:3] = 01 or OP[4:3] = 10, as defined above), the device will default to

factory trim settings for R

ON and ignore ZQ calibration commands. In either case, the system might not function as intended.

4. If a ZQ self test returns a value of 11b, this indicates that the device has detected a resistor connection to the ZQ pin. Note

that this result cannot be used to validate the ZQ resistor value, nor does it indicate that the ZQ resistor tolerance meets the

specified limits (240 ohm ±1%).

MR0_Device Information (MA<7:0> = 00H):

OP7

OP6

OP5

OP4

OP3

OP2

OP1

OP0

(RFU)

OP <4:3>

RZQI

Read-only

(RFU)

DAI

OP1

DI (Device Information)

Read-only

0B: SDRAM

1B: Do Not Use

B: RZQ self test not supported

B: ZQ pin might be connected to VDDCA or left floating

B: ZQ pin might be shorted to ground

B: ZQ pin self test compelte; no error condition detected

OP0

DAI (Device Auto-Initialization

Status)

Read-only

0B: DAI complete

1B: DAI still in progress

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