[Arm-netbook] Questions about display resolution

[Derek LaHousse]

Arm-netbooks,

So, I've been thinking on the issue of a laptop using EOMA-68, as well as the
mini-eng/monster-eng boards.  Naturally, these things will want to run a
display.  According to the EOMA-68 spec, we've got 8-bit color on a ttl
interface.  This interface is expected to be converted to LVDS to run a screen,
or DVI for an eng-board.

TI says displays typically use 1 channel LVDS (that's 4D+C for 24-bit) up to
1400x1050, and 2 channel LVDS up to 1920x1200 [1].  TI says 70-75 MHz pixel
clocks are common.

Some math:  1 channel at 75MHz / 1400 / 1050 = 51 Hz.  This seems reasonable for
a display (1400x1050 at 50Hz).  2 channels at 75MHz / 1920 / 1200 = 65Hz.  Okay. 
But to run a 1920x1200 at 60Hz display on one channel (Like the TF701), we need the
RGB-TTL to have a rate of 138MHz.  TI's fastest chip tops out at 135MHz.  Oops?

So, a few questions:
- What's the fastest rate the A10 can output RGB-TTL?
- What screens take a single channel LVDS at more than 1400x1050?  What're their
refresh rates?

TI does have a chip that can take a single RGB-TTL interface and output to two
LVDS channels.  I thought this was only good for pixel doubling.  Is it
reasonable to expect a single RGB-TTL to run at > 100 MHz in other chips?

References:
[1] http://www.ti.com/lit/an/slla325/slla325.pdf