TLP request with Root port to endpoint

Question

Hello,I had a problem with the Read Config Type 0 request from the Root port to the endpointI use the CRA interface and my query is32'h 0400000132'h0000170F32'h0000000032'h00000000I use one endpoint and one communication line, cfg_bus [12: 0] on both devices shows 13'd0.Ltssmstate [4: 0] takes the value 0x0F and lane_act [3: 0] takes 0x01.The problem is that when sending a request from the Root port, it receives it and responds to it (gives its configuration space to the Root port) and the data does not reach the endpoint, I use Cyclone 5, tell me what could be the problem?

alast5 · Answer

Hello,Solved a problemFirst, I assigned the device number and bus number0x440000010x0000100F0x000000180x00010100 and then done the configuration read type 10x050000010x0000100F0x010800000x00000000thanks for the help

keenyewl_intel · Answer

Hi there, sorry for being late, we will find someone to address your question.

boont_intel · Answer

Hi Sir,Let me clarify, do you mean the endpoint is ack with the config_read request but never return a data?

alast5 · Answer

Hello,That's right, as I understand it, this is connected with routing, but apparently I don’t understand how to use it correctly, or is it connected with "enumeration"?Sorry for my bad englishSincerely, Alexander

boont_intel · Answer

Hi Sir,can you help to show us fro where you observe the ACK and waiting for the data? Do you try with other address? Also, if you perform memory read, will you facing the same issue?Yes, usually config_read/write is happen during enumeration automatically,  user do not need to trigger it manually. May I know is the enumeration is complete at the root port?

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TLP request with Root port to endpoint

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