AWR1843: Why MCAN_TDCR register TDCO bits are set to 8 in Mmwave_SDK test code?

Kensuke

Expert 1140 points

Part Number: AWR1843

Hi,

Why MCAN_TDCR register TDCO bits are set to 8 in Mmwave_SDK test code?

It become SSP (Secondary Sampling Point) 100% on 40MHz Xtal and data phase rate 5 Mbps.

over 5 years ago

0 Jitendra Gupta over 5 years ago

TI__Guru 69960 points

Hi Kensuke-san,

TDCO bits uses to set Transmitter Delay Compensation Offset in MCAN peripheral.

Could you explain more if this setting is affecting your requirements?

Regards,

Jitendra

0 Kensuke over 5 years ago in reply to Jitendra Gupta

Expert 1140 points

Hi Jitendra,

"TDCO = 8" means the SSP is set to 200 ns at 40MHz Xtal i.e. 25ns/clock * 8 = 200 ns.

But CAN data rate is set to 5 Mbps. It means can bit time takes 200 ns.

So SSP setting is too late.

That is my question point.

0 Raghunandan Kamath over 5 years ago in reply to Kensuke

TI__Mastermind 22155 points

Hozumi-san,

The AWR1843/1642BOOST can work upto 8Mbps baud rate.The offset is set to 8 just to make sure that user does not have to change these values in case he wants to operate in 8Mbps. You can reduce this value to suit your application needs.

-Raghu

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AWR1843: Why MCAN_TDCR register TDCO bits are set to 8 in Mmwave_SDK test code?