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Occasional Contributor

5 years ago

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Question about UniPHY with DDR2

1) avl_size only has 3 bits, how to set burstcount = 8?

2) during ddr2 simulation using intel model, there are two many avl_ready = 0 even I set avl_size = 3'd4;

It significantly impact the data transfer efficiency. How to improve it?

ybin
5 years ago
Hello,

avl_size is generated according to the maximum AVMM burst length, the default length is 4, this is why you will find the signal is only 3bits. You can enlarge burst length is you want to improve efficiency of controller.

5 Replies

ybin
Occasional Contributor
5 years ago
Hello,

avl_size is generated according to the maximum AVMM burst length, the default length is 4, this is why you will find the signal is only 3bits. You can enlarge burst length is you want to improve efficiency of controller.
- XQSHEN
  Occasional Contributor
  5 years ago
  Should that setting impact the burst length of below?
  - ybin
    Occasional Contributor
    5 years ago
    The setting you mentioned doesn't impact avl_size, but it can impact efficiency, the default value is 8, no need to modify it. You can just modify maximum AVMM burst length value.