ST20-GP6 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
ST20-GP6 Datasheet PDF : 123 Pages
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ST20-GP6
determines whether the accumulated carrier phase in the NCO are reset to zero automatically or
continue from their existing value. The bit allocations are given in Table 3.1.
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
00
840 µs
256
Tracking
01
970 µs
256
10
31 µs
8
Acquisition
11
62 µs
16
2
NCOResetEnable
When set to 1, the accumulated NCO phase for a channel is reset when the cor-
responding PRN code register is written.
3
PRNDisable
When set to 1, all PRN generators are disabled.
Table 3.1 DSPControl register format
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.
PRNcode0-11
DSP base address + #00 to #2C
Bit
Bit field
6:0
PRNcode
Function
Satellite code as a 7-bit value.
Table 3.2 PRNcode0-11 register format
The bit-fields for selecting particular GPS satellites are given in Table 3.3.
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