DVDD18 powered I/O pins for AM1808

Gloria Mattson

Other Parts Discussed in Thread: AM1808

Question about the AM1808: There is a static 1.8V IO rail called DVDD18 which is powered from pins F14, G6, G10, G11, G12, J13, K5, L6, P13, R13. What is this rail used for and what IO pins are powered from it?

over 14 years ago

0 David Kessner over 14 years ago

Prodigy 30 points

Bump.

0 Kevin McCalmon over 14 years ago in reply to David Kessner

Prodigy 130 points

1.8V supply is required for dual-voltage IO buffers as noted below.

http://e2e.ti.com/support/dsp/tms320c6000_high_performance_dsps/f/115/p/42346/152309.aspx

You will still need a 1.8V supply for DVDD18 power pins (even if you don't use SATA, USB and DDR). The dual-voltage IO buffers require 3 supplies: CVDD, a static 1.8V supply and the variable 1.8V or 3.3V supply. DVDD18 is the static 1.8V supply to these pins.

Also, if you check the Errata there is a concern that the 1.8V rail could be pulled up to 2.7V.

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DVDD18 powered I/O pins for AM1808