參數(shù)資料
型號: XE8000EV108
廠商: Semtech
文件頁數(shù): 137/143頁
文件大?。?/td> 0K
描述: EVAL BOARD FOR XE8806/XE8807
標準包裝: 1
類型: MCU
適用于相關產(chǎn)品: XE88LC06AMI026
所含物品: 完全組裝的評估板
產(chǎn)品目錄頁面: 585 (CN2011-ZH PDF)
Semtech 2006
www.semtech.com
14-13
XE8806A/XE8807A
NRZ - Level
Bi-Phase - Level
output bitstream
output clock
Figure 14-7 : Output clock in Transmission mode
14.10 Baud rate selection
In order to have correct baud rates, the interface has to be fed with a stable and trimmed clock source. The clock
source can be an external clock source or the RC oscillator. The precision of the baud rate will depend on the
precision of the selected clock source. The choice between the RC oscillator and the external clock source is made
with the bit EnExtClock in RegSysClock. The precision of the obtained baud rate is directly proportional to the
frequency deviation of the used clock source.
The bits RfifBRCoarse[1:0] and RfifBRFine[3:0] in RegRfifCmd1 are used to select the appropriate baud rate.
Several RC division factors are available.
The expression of the baud rate is the following:
16
*
coarse
fine
f
baudrate
RCExt
=
with:
RCExt
f
: RC frequency or the half the external clock frequency.
fine and coarse: the division factors selected by RfifBRCoarse and RfifBRFine.
Note that the baud rate is the rate at which the chips are transmitted and is twice the bit rate in Manchester and
Miller coding since these codes use two chips per bit (see chapter 14.7).
RfifBRFine[3:0]
fine
0000
1
0001
2
0010
3
0011
4
...
1101
14
1110
15
1111
16
Table 14-17 : Effect of RfifBRFine[3:0]
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