Supply voltage for RVDD (internal ram supply)

Added by Stéphane Peter almost 12 years ago

Hello,
In the OMAP-L138 data sheet (sprs586d) chapter 2.8.27, I see that RVDD (internal ram supply) needs 1.2V respective 1.3V for 456MHz.
To what voltage source are these pins connected to? I just see 1.2V, 1.8V, 3.3V and the variable core voltage pads.

Best regards
Stéphane

Replies (2)

RE: Supply voltage for RVDD (internal ram supply) - Added by Michael Williamson almost 12 years ago

RVDD is connected to the CORE voltage.

So when you run at 456 MHz, the RVDD is bumped up to 1.3 volts as well.

The minimum core voltage that can be applied is 1.2 volts (even if you drop your OPP down to 200 MHz or below) because of this design point.

We spent a fair amount of time with TI on this (there should be an E2E post about this), and they advised that this design was "OK", but as you might imaging the low power options are now restricted a bit. This should also be in the revision history / Errata for the part.

-Mike

RE: Supply voltage for RVDD (internal ram supply) - Added by Stéphane Peter almost 12 years ago

Hi Mike,
Thanks for the information and for the hint/link to the errata sheet.
Stéphane

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