Nokia 7088 Troubleshooting Manual page 13

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The input buffer (TCXO_IN) accepts sinusoidal or square wave signals at or near
19.2 MHz. The input buffer (TCXO_IN) is powered from the TCXO regulator while
the output buffer is powered by VDD_MSMP.
The regulator of TCXO is turned off after the TCXO_EN signal is removed. Upon
power-up, the PM defaults to this SBI-controlled mode with the TCXO defaulted on.
This assures the MSM will always have a clock available immediately at power-up
even if TCXO_EN is low.
TCXO waveform (19.2MHz)
Issue 1 12/2006 © 2006 Nokia Corporation
Figure 5: TCXO Enable Timing Diagram
Figure 6: TCXO Timing at 25
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