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DDR memory interface of ADV8005's IBIS-model

Question asked by Kikka2 on Feb 9, 2018
Latest reply on Feb 13, 2018 by Kikka2

Hello.

 

Your IBIS model of ADV8005 describes the following part.

It means we can adjust the drive strength of DDR memory interface.

Which are registers that can adjust it?

Please tell me the default value and your recommended value of its registers in addition.

 

<From IBIS model>

[Model Selector] DDR2_IO
DDR2_IO_drv0 Digital I/O, push-pull, drive strength 00
DDR2_IO_drv1 Digital I/O, push-pull, drive strength 01
DDR2_IO_drv2 Digital I/O, push-pull, drive strength 10
DDR2_IO_drv3 Digital I/O, push-pull, drive strength 11

[Model Selector] DDR2_OP
DDR2_OP_drv0 Digital OP, push-pull, drive strength 00
DDR2_OP_drv1 Digital OP, push-pull, drive strength 01
DDR2_OP_drv2 Digital OP, push-pull, drive strength 10
DDR2_OP_drv3 Digital OP, push-pull, drive strength 11

[Model Selector] MEM_DQS
MEM_DQS_drv1 Digital O, push-pull, drive strength 01 (Default - 55H)
MEM_DQS_drv0 Digital O, push-pull, drive strength 00 (00H)
MEM_DQS_drv2 Digital O, push-pull, drive strength 10 (AAH)
MEM_DQS_drv3 Digital O, push-pull, drive strength 11 (FFH)

[Model Selector] MEM_DQSB
MEM_DQSB_drv1 Digital O, push-pull, drive strength 01 (Default - 55H)
MEM_DQSB_drv0 Digital O, push-pull, drive strength 00 (00H)
MEM_DQSB_drv2 Digital O, push-pull, drive strength 10 (AAH)
MEM_DQSB_drv3 Digital O, push-pull, drive strength 11 (FFH)

[Model Selector] MEM_CKB
MEM_CKB_drv2 Digital O, push-pull, drive strength 10 (Default - AAH)
MEM_CKB_drv1 Digital O, push-pull, drive strength 01 (55H)
MEM_CKB_drv0 Digital O, push-pull, drive strength 00 (00H)
MEM_CKB_drv3 Digital O, push-pull, drive strength 11 (FFH)

[Model Selector] MEM_CK
MEM_CK_drv2 Digital O, push-pull, drive strength 10 (Default - AAH)
MEM_CK_drv1 Digital O, push-pull, drive strength 01 (55H)
MEM_CK_drv0 Digital O, push-pull, drive strength 00 (00H)
MEM_CK_drv3 Digital O, push-pull, drive strength 11 (FFH)

 

 

Best regards.

Kikka

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