SRIO Internal Clock

Senthil Kumar

Hi,

To calculate link timeout and silence timer values for SRIO peripheral, SRV_CLK is used. Is SRV_CLK means input reference clock to SRIO peripheral?

DMA Clock is used in SP_RT_CTL for response timeout. How to calculate the DMA clock.

SYSCLK10 is given for SRIO Module. Is this used for SRIO DMA module.

Prescale value needs to be selected in Peripheral Setting Control register and Port IP Prescalar register. For which clock source this prescale divider will be used.

With Regards,

Senthil Kumar G

over 12 years ago

0 Elush Shirazpour over 12 years ago

TI__Intellectual 2790 points

Senthil

Yes the SRV_CLK is the input reference clock to the SRIO peripheral.

The VBUSP clock is equivalent to the VBUSM DMA clock.

What is SYCLK10?

The prescale value is used for which ever clock source you select.

Thanks

Elush

0 Daisuke Maeda over 12 years ago in reply to Elush Shirazpour

Guru 20205 points

Hi Elush,

What is the ip_clk_frequency?

The PRESCALAR_SRV_CLK register value is "ip_clk_frequency (in MHz) /10" rounded to the nearest integer.

Best regards,

Daisuke

0 Daisuke Maeda over 12 years ago in reply to Elush Shirazpour

Guru 20205 points

Hi Elush,

SYSCLK10 is the divided down output clock of the Main PLL in the C66x device and is 1/3-rate clock for SRIO only.
Therefore, for the 1.25GHz speedgrade device it is 416.6MHz.

Is the VBUS frequency equivalent to the SYSCLK10 frequency?

Best regards,

Daisuke

0 tscheck over 12 years ago in reply to Daisuke Maeda

TI__Mastermind 23525 points

Please see http://e2e.ti.com/support/dsp/c6000_multi-core_dsps/f/639/t/282116.aspx

for a definition of the IP_CLK and how to determine frequency. This clock is used for timers in the physical layer. For logical layer timers, the CPU clock/3 frequency is always used along with the Prescalar_select field in the RIO_PER_SET_CNTL register. This would be used for the packet response timer, RIO_SP_RT_CTL.

Regards,

Travis

0 Daisuke Maeda over 12 years ago in reply to tscheck

Guru 20205 points

Hi Travis,

Thank you for your kind support.

Best regards,

Daisuke

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SRIO Internal Clock