Ed McGettigan <[email protected]> wrote:

< Assuming that the bitstream information is correct up until the real
< configuration frame data starts, damage may occur with a corrupted
< bitstream after that point. Loading all ones can be particular
< problematic as most configuration cells are active high.

Given that many programmable memories clear to 1's, it would
have been convenient to include an inverter such that 1's were
safer than 0's.

I remember in the early EPROM days, I believe the 1702 cleared
to zeros, and then the 2708 cleared to ones. Zero was convenient
for processors with NOP at X'00'.

-- glen