On Wed, Feb 13, 2008 at 07:25:41AM -0300, Werner Almesberger wrote: > [EMAIL PROTECTED] wrote: > > R70 and R71 don't mount on debug v3 (whatever version). > > Okay, we need to fix that. > > > These two resistors are used for 3.3V bias to 1.8V. > > I check M58WR016KB's datasheet and NOR FLASH can program and erase on > > VPP= 1.3V~3.3V. Therefore, we don't need these resistors. > > What we don't need is the voltage divider (and particularly not with > 1% accuracy ;-) > > However, we still need to pull nNOR_WP up, for GTA02. As a general > precaution, I think something like 10k would be better than 0R. > > So we should drop R70 (i.e., do nothing there) and put something on > R71. And we also have to make sure that this change is made on all > v3 boards that ship for/with GTA02 devices.
Werner, I think the idea was to control the nNOR_WP via some GPIO bits of the FTDI 2232 chip, i.e. have it under host software control. This is why the resistors are just a resistive divider to get the 1.8V. Cheers, -- - Harald Welte <[EMAIL PROTECTED]> http://openmoko.org/ ============================================================================ Software for the world's first truly open Free Software mobile phone
