PROCESSOR-SDK-AM64X: vbusm and CBASS question

Jun Tu

Expert 1640 points

Part Number: PROCESSOR-SDK-AM64X

Hi, in ti document spruim2h.pdf

you mentioned in CBASS, there is a QOS. (priority)

however in ddr you mentioned also there is vbusm. (priority)

what is the relationship between two?

I assume vbusm is for ddr only it is not for CBASS priority, am I right? or DDR vbusm priority is actually assingned by the cbass, it is the same as CBASS priority.

Thanks.

over 1 year ago

0 PaulM over 1 year ago

TI__Mastermind 29085 points

I am checking on this and will get back to you shortly.

--Paul

+1 PaulM over 1 year ago in reply to PaulM

TI__Mastermind 29085 points

Jun

VBUSM interface: a multi-issue interface
CBASS: this is a crossbar module to provide physical connection among the initiators and targets

The DDR connects to the CBASS using a VBUSM interface.

The CoS within the DDR controller allows the remapping of the CBASS/VBUSM priority to the DDR controllers priority.

--Paul

+1 PaulM over 1 year ago in reply to PaulM

TI__Mastermind 29085 points

Note: it's recommended that you leave the DDR CoS as default in order to allow the controller to optimize transactions.

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PROCESSOR-SDK-AM64X: vbusm and CBASS question