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參數(shù)資料
| 型號： | ST20GP1 |
| 英文描述： | MAX 7000 CPLD 256 MC 208-PQFP |
| 中文描述： | GPS處理器 |
| 文件頁數(shù)： | 15/116頁 |
| 文件大?。?/td> | 1107K |
| 代理商： | ST20GP1 |
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ST20-GP1
15/116
For channels 0 and 1, RTCA-SC159 satellite codes can also be selected. This is achieved by
setting the
PRNcode0-11
register appropriately and also writing the initial value for the satellite to
the
PRNinitialVal0-1
register, see Table 3.8. If uninitialized by the software, the
PRNinitialVal
register defaults to 11 1111 1111 (#3FF) as required for GPS satellites.
The
PRNcode0-11
and
PRNinitialVal0-1
registers are normally written only when the satellite is
first chosen.
PRNphase0-11 registers
The
PRN0-11phase
registers determine the relative delay between the receiver master clock, and
the start of the one millisecond repetitive code sequence. The code sequence starts when the
receiver clock counter (invisible to the software except through message timestamps) reaches the
value written to the
PRNphase0-11
register. The
PRNphase0-11
register must only be written
once per satellite milliseconds-epoch, which varies from the receiver epoch dynamically due to
satellite motion. Synchronism with the software is achieved by reading the register, when a write
enable flag is returned. If not enabled, the write operation is abandoned by the software.
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#29
#41
#52
#63
#74
#05
#16
#31
#64
#75
#06
#17
#28
#61
#72
#03
#14
#25
#24
#71
#02
#24
10
4
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9
3
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10
7
8
10
9
1
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1
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8
1
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1
2
4
WAAS
b
#20
10
0
a. Refer to the US DoD document ICD-GPS-200.
b. It is the responsibility of the software to ensure that when this value is selected, a suitable value has
been written into the
PRNinitialVal0-1
register. If this channel is later used for a standard GPS sat-
ellite, the
PRNinitialVal0-1
must be set to all ones (#3FF).
Satellite ID
PRNcode0-11
register value
Taps selected from G2 shift register
a
by bits 6 to 4
by bits 3 to 0
Table 3.3
PRNcode0-11
register value
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PDF描述 |
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| ST20GP6 | MAX 7000 CPLD 256 MC 208-RQFP |
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| ST25C02AB6 | Stratix FPGA 25K FBGA-672 |
| ST25C02AM1 | IC ACEX 1K FPGA 100K 208-PQFP |
| ST25C02AM6 | Cyclone II FPGA 20K FBGA-256 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ST20-GP1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:GPS PROCESSOR |
| ST20GP1X33S | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:GPS PROCESSOR |
| ST20GP6 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:GPS PROCESSOR |
| ST20-GP6 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:GPS PROCESSOR |
| ST20GP6CT33S | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:GPS PROCESSOR |
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