C 6457 Related

Ruifeng Wang said:

1. Unused module Power Down:

We have a lot unused modules: DDR2/Timer 0&1/I2C/UTOPIA/SRIO/EMAC &SGMII/MDIO, How to power down these modules? By software (Register control) or Hardware involved?

The easiest way to power these down is via the Power and Sleep Control (PSC) registers. The PSC module allows you to completely disable peripherals - see this document.

Ruifeng Wang said:

2. What is the use case of leaving input buffers active when the relevant modules are not intended to be used? Should they just be shut down?

I am interpreting this as a "what to do with the unused pins" but please let me know if you mean otherwise. Typically unused pins can be left floating unless explicitly stated otherwise in the datasheet. We usually suggest reinforcing the internal pull-up/down resistors with external resistors, but in many/most cases it is probably not necessary.

I hope this helps.