Nokia NPD-4 Series Troubleshooting - Gps page 12

NPD-4
Troubleshooting — GPS
RF Data and Clock
The GPS RF ASIC sends encoded raw GPS data to the GPS BB ASIC for further processing
via a four-line synchronous parallel interface. These signals are data (labeled B0, B1, B2,
and B3) and GPS_CLK. The GPS_CLK has been previously tested (see the flowchart). The
four-data lines should show continuous activity almost immediately after power has
been applied to the phone (see Figure 7).
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Figure 6: Spi Data and Clock
Figure 7: RF Data and Clock
Nokia Corporation
CCS Technical Documentation
Confidential Issue 1 02/2003