參數(shù)資料
型號(hào): XE8000EV108
廠商: Semtech
文件頁數(shù): 126/143頁
文件大小: 0K
描述: EVAL BOARD FOR XE8806/XE8807
標(biāo)準(zhǔn)包裝: 1
類型: MCU
適用于相關(guān)產(chǎn)品: XE88LC06AMI026
所含物品: 完全組裝的評(píng)估板
產(chǎn)品目錄頁面: 585 (CN2011-ZH PDF)
Semtech 2006
www.semtech.com
14-3
XE8806A/XE8807A
The Reception block consists of:
The “Filter”. The input data are filtered depending on the selected baud rate. The block extracts the bit
synchronization clock. When an external bit synchronization clock is used, the filter is bypassed.
The “Start Detection” block. This block detects a programmable start sequence and therefore synchronizes at
the message start. The interface ignores incoming messages until the start sequence is detected. This block
can be bypassed or an external message synchronization signal can be used (match in Figure 14-1).
The “PCM Decoder” which decodes the 3 main types of PCM waveforms ( i.e. NRZ, Bi-Phase, Miller). This
block can be bypassed.
The “Shift Register” and the FIFO, that do the serial to parallel conversion and memorize the input data.
The Transmission block consists of:
The FIFO and the “Shift Register” which store the data and do the parallel to serial conversion.
The “Encoder” which encodes the serial data into the chosen PCM type. This block can be bypassed.
The Prescaler generates the clock signals needed for the reception and transmission depending on the selected
baud rate and PCM code type.
14.4
Register map
register name
RegRfifCmd1
RegRfifCmd2
RegRfifCmd3
RegRfifTx
RegRfifTxSta
RegRfifRx
RegRfifRxSta
RegRfifRxSPat
Table 14-1: Rfif registers
pos.
RegRfifCmd1
rw
reset
description
7-6
unused
-
5-4
RfifBRCoarse(1:0)
r/w
00 nresetglobal
Select baud rate (coarse selection)
3-0
RfifBRFine(3:0)
r/w
0000 nresetglobal
Select baud rate (fine selection)
Table 14-2: RegRfifCmd1
pos.
RegRfifCmd2
rw
reset
description
7-6
RfifEnStart(1:0)
r/w
00 nresetglobal
Start Detection mode in Rx mode (see
page 14-8)
5
RfifEnCod
r/w
0 nresetglobal
‘1’ enables decoder (Rx) / encoder (Tx)
4
RfifRxClock
r/w
0 nresetglobal
‘1’ enables external clock input (Rx)
3
RfifTxClock
r/w
0 nresetglobal
‘1’ enables external clock output (Tx)
2-0
RfifPCM(2:0)
r/w
000 nresetglobal
Select PCM type (see page 14-6)
Table 14-3: RegRfifCmd2
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