ST20-GP1 datasheet(14/116 Pages) STMICROELECTRONICS

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ST20-GP1

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PRNcode0-11 registers

The PRNcode0-11 registers choose the code for the particular satellite, and writing these causes a

reset to the accumulated carrier phase in the NCO for the corresponding channel, if enabled by the

DSPControl register.

The bit-ﬁelds for selecting particular GPS satellites are given in Table 3.3.

DSPControl

DSP base address + #140

Write only

Bit

Bit ﬁeld

Function

1:0

SampleRate

These bits control the sampling rate (the rate at which data is sent to the DMA

controller). The encoding of these bits is as follows:

SampleRate[1:0]

Transfer period

No. of samples

accumulated

Mode

840

µs

256

Tracking

970

µs

256

µs

Acquisition

µs16

NCOResetEnable

When set to 1, the accumulated NCO phase for a channel is reset when the corre-

sponding PRN code register is written.

PRNDisable

When set to 1, all PRN generators are disabled.

Table 3.1 DSPControl register format

PRNcode0-11

DSP base address + #00 to #2C

Write only

Bit

Bit ﬁeld

Function

6:0

PRNcode

Satellite code as a 7-bit value.

Table 3.2 PRNcode0-11 register format

Satellite ID

PRNcode0-11

Taps selected from G2 shift registera

by bits 6 to 4

by bits 3 to 0

#62

#73

#04

#15

#11

#22

#01

#12

#23

#32

#43

#65

#76

#07

#18

Table 3.3 PRNcode0-11 register value

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