RE: GPMC address signals gpmc_a11 to gpmc_a26

RE: GPMC address signals gpmc_a11 to gpmc_a26

[Søren Steen Christensen]

> Hi,
> 	Can someone tell me why gpmc_a11 to gpmc_a26 signals are
> missing from
> initial pages for the CBB package specification, in the OMAP3515/03
> Applications Processor document (Rev. C)?
> 
> If you go down to page 91 of the same document, it lists gpmc_a11 to
> gpmc_a26.
> 
> Are the address lines multiplexed somehow for the TI OMAP GPMC,
> because if you look at the following table, the pin numbers are the
> same for a couple of them, e.g AC16 for gpmc_a3, gpmc_a19. I can't
> seem to find a pattern here.
> 
> Best regards,
> 
> Elvis


Hi Elvis,

The GPMC is an address/data-multiplexed bus sharing the lower 16 address
lines between address and data.
I admit, that the naming in the Datasheet might be a bit misleading, but the
way it should be read is like:

GPMC_dxx is the 16 data lines for data

GPMC_dxx is the lower 16 address lines for address
GPMC_a1 is address line 17
GPMC_a2 address line 18
GPMC_a3 address line 19 - and so forth

This as well explains why you though that address lines 3 and 19 could be
multiplexed :-)

Best regards
  Søren


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