- 您现在的位置：买卖IC网 > PDF目录67672 > GP2021 (Mitel Networks Corporation) GPS 12 channel Correlator Advance Information PDF资料下载
参数资料
| 型号： | GP2021 |
| 厂商： | Mitel Networks Corporation |
| 英文描述： | GPS 12 channel Correlator Advance Information |
| 中文描述： | 全球定位系统12通道相关器研究进展信息 |
| 文件页数： | 25/62页 |
| 文件大小： | 372K |
| 代理商： | GP2021 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页当前第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页
31
GP2021
CHx_EPOCH_CHECK
(Read Address)
Bits 15 to 14: Not used.
Bits 13 to 8 : Instantaneous value of CHx_20MS_EPOCH.
Bits 7 to 5 : Not used.
Bits 4 to 0 : Instantaneous value of CHx_1MS_EPOCH.
Reading this address gives the instantaneous value of the
CHx_1MS_EPOCH and the CHx_20MS_EPOCH counters. It
can be used to verify if the Epoch counters have been properly
initialised by the software. Its value is not latched and is
incremented on each DUMP. To ensure the correct result, this
register should be read only when there is no possibility of
getting a DUMP during the read cycle, by synchronising the
read to NEW_ACCUM_DATA. The ranges of these values are
the same as those seen in the CHx_EPOCH register.
CHx_EPOCH
(Read Address)
Bits 15, 14, 7, 6 and 5: Not used. Read gives Low.
Bits 13 to 8: CHx_20MS_EPOCH: The 20 ms epoch counter
value that was sampled at the last TIC event, with a valid range
from 0 to 49.
Bits 4 to 0: CHx_1MS_EPOCH: The 1 ms epoch counter value
that was sampled at the last TIC event, with a valid range from
0 to 19.
CHx_EPOCH_COUNT_LOAD
MULTI_EPOCH_COUNT_LOAD
ALL_EPOCH_COUNT_LOAD
(Write Address)
Bits 15, 14, 7, 6, and 5: Not used.
Bits 13 to 8: CHx_20MS_EPOCH: The value to be loaded into
the 20 millisecond epoch counter, with a valid range from 0 to
49.
Bits 4 to 0: CHx_1MS_EPOCH: The value to be loaded into the
1 millisecond epoch counter, with a valid range from 0 to 19.
This operation is affected by the current channel mode,
(PRESET or UPDATE). In UPDATE mode, the data written
into these registers is immediately transferred to the 1 ms and
20 ms epoch counters. In PRESET mode however, the data
is transferred only after the next TIC. It is important to load the
CHx_EPOCH register last in the PRESET mode loading
sequence because the trailing edge of a write to this register
enables the whole PRESET operation on the next TIC. Refer
to Detailed Operation of the GP2021 for more details of the
PRESET mode. *
* Refer to page 23
half chips in a GPS C/A code, a programmed value of 2047 is
equivalent to a programmed value of 1, but the next DUMP
event will take place 1 ms later. In PRESET mode, the slew
timing is set only by TIC, which will also reset the code
generator, (no DUMP is needed). A non–zero slew must
always be programmed when using PRESET mode.
The CHx_CODE_SLEW register can be written to at any time.
If two accesses have taken place before a DUMP in UPDATE
mode or before a TIC when in PRESET mode, the latest value
will be used at the next slew operation. During the time a slew
process is being executed, any further write access to the
CHx_CODE_SLEW register will be stored until the following
DUMP and then cause the transfer of this new value into the
counter. This situation may be avoided by synchronising the
access with the associated CHx_NEW_ACCUM_DATA
status bit.
If a channel is inactive, a non–zero slew value should be
written into CHx_CODE_SLEW before the channel is
released. This write will be acted on immediately the reset is
released.
If a TIC occurs during or soon after a slew the channel will
not be locked to the satellite, so the Measurement Data for that
channel will not be of use.
The ability to read the Slew counter is included only for
testing hardware or software and has no other use. It will only
give a non–zero result if the read occurs during the actual slew
operation. An example of a slewing event is shown in Fig.23.
t1: Load 5 into CHx_CODE_SLEW register = 2.5 chips delay
1023 CHIPS
1025.5 CHIPS
DUMP
TIME
t1
C/A CODE CHIP NO.:
1021
1022
1023
1
2
3
Fig.23 Slew timing in UPDATE mode
相关PDF资料 |
PDF描述 |
|---|---|
| GRM40Y5V105Z16 | Circular Connector; MIL SPEC:MIL-C-26482, Series I, Solder; Body Material:Aluminum; Series:PT06; No. of Contacts:21; Connector Shell Size:22; Connecting Termination:Solder; Circular Shell Style:Straight Plug; Body Style:Straight |
| GRM42-6X5R475K10 | 50/100M SOT-23 CMOS RF LDO REGULATORS |
| GT- 32090 | Highly Integrated Single-Chip System Controller(高集成单片系统控制器) |
| GT-48001A | Switched Ethernet Controller For 10BaseX(10BaseX交换式快速以太网控制器) |
| GT-48002A | Switched Fast Ethernet Controller for 100BaseX(100BaseX交换式快速以太网控制器) |
相关代理商/技术参数 |
参数描述 |
|---|---|
| GP2021IGGQ1R | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Correlator |
| GP202K | 制造商:GTM 制造商全称:GTM 功能描述:SURFACE MOUNT,SWITCHING DIODE |
| GP2030S | 制造商:GTM 制造商全称:GTM 功能描述:N AND P-CHANNEL ENHANCEMENT MODE POWER MOSFET |
| GP2-031X250-50 | 制造商:GROOV-PIN 功能描述: |
| GP204 | 制造商:DEC 制造商全称:DEC 功能描述:2 AMP SOFT GLASS PASSIVATED DIODES |
发布紧急采购，3分钟左右您将得到回复。