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Harald Welte laforge at gnumonks.orgHi Steve, On Sun, Apr 11, 2010 at 01:28:27AM +0200, Steve Markgraf wrote: > >Ideally, we would even use the Calypso-internal PLL (for ARM or DSP) to > >multiply it up to the required 52 MHz. However, neither the Openmoko > >nor the Compal/Motorola phones expose any of the 3 clock output pads :( > > Hmm, 3 output pads? I only see DPLLCLK and CLKOUT_DSP, the third one > would be CLKX_SPI, but can that one be used for this purpose? The third one is MCLK, i.e. the clock that the Calypos PLL feeds into the ARM core. > I looked at the Motorola W220, which uses the DPLLCLK-pin as TSPACT5 > wired through a buffer to GSM900_TX of the antenna switch. > > see: > http://www.steve-m.de/projects/osmocom/w220_dpllclk.jpg > > The pin on the buffer is quite well accessible, so we could tie it > to low (and disable TX with that, but we don't need that anyway, > right?) and use VC1B as clock output. Yes, I agree, this should work just fine. However, using the Altera internal PLL to multiply from 13 to 52 sounds even better! > Our code already runs on the W220, but we would need a driver for > the Si4210 GSM transceiver. That doesn't sound hard. Didn't you say that you have documentation? -- - Harald Welte <laforge at gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)