EVM6678 SRIO stabilization time

YC, Tsai

My customer has one SRIO question on custom board.

There are three DSP on the board and one DSP is connected to two other DSP with SRIO like below.

DSP1 <- x1 ->DSP2 <- x1 -> DSP3

1. DSP1/2/3 initialize SRIO port and wait some time(about 10 seconds).
2. DSP2 starts to send test data to DSP1/3 after waiting time.
3. And DSP1 and DSP3 re-send received data to DSP2.
4. Then DSP2 compares data from DSP1/3 with its test data.

The problem is that the reply time is very variable.
It takes 1 ~ 3 minutes for DSP2 to receive data re-sent by DSP1/3.

Can you let me know how long it takes to start transmission on two EVM?

Regards,

over 11 years ago

0 Ganapathi Dhandapani95 over 11 years ago

TI__Mastermind 28085 points

Hi,

I think DSP takes less than 10 seconds to initialize SRIO ports and linkup. I don't know the exact SRIO stabilization time. I will check with my team and get back to you.

Better to use the SRIO LSU or doorbell interrupts, it will reduce the waiting time for receive/transfer. For more info on doorbell interrupt handling see section 2.3.9.1.1. in: www.ti.com/.../sprugw1b.pdf

Thanks,

0 YC, Tsai over 11 years ago in reply to Ganapathi Dhandapani95

Intellectual 590 points

Thank you for the reply

Regards,

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EVM6678 SRIO stabilization time