TUSB73x0 and CPU overhead

Ben Klass

Other Parts Discussed in Thread: TUSB7320

When using the TUSB73x0, how much host CPU activity is required to transfer data? For example, if the host wants to write 4 KBytes of data, does need to actively send all of the data to the TUSB73x0 using PCIe write transactions or will the TUSB73x0 fetch the data using PCIe read transactions?

Thank you,

ben

over 13 years ago

0 Elias Villegas M. over 13 years ago

TI__Guru* 76130 points

Hello,

The TUSB73x0 does not have pre-fetch capabilities, the PCIe host will have to actively send the data.

Regards.

0 Ben Klass over 13 years ago in reply to Elias Villegas M.

Prodigy 150 points

So the CPU will have to be involved in writes to the TUSB7320. What about when the host wants to read 4 KB of data from the TSUB720? Does the host CPU need to initiate a PCIe read to get the data, or can the TSUB7320 initiate a PCIe write to host memory?

Thank you,

ben

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TUSB73x0 and CPU overhead