CMX980AL7 Ver la hoja de datos (PDF) - MX-COM Inc
Número de pieza
componentes Descripción
Fabricante
CMX980AL7 Datasheet PDF : 82 Pages
| |||
Digital Radio Baseband Processor
14
CMX980A Advance Information
4.7.1 Command Interface
A serial command word consists of a 16-bit frame. Each frame is marked by an active Frame Sync event that
precedes the MSB bit. A command word can be either a control word or a transmit data word.
MSB
LSB
W /R
Address
Data
15 14
87
0
Command Control Serial Word
MSB
LSB
1
Tx Data Address U/D 4/1
Tx Data
15 14
10 9 8 7
0
Command Transmit Data Serial Word
4.7.2 Command Read Interface
Command read data is either output on one of the serial read ports, or driven out in the last 8 bits (data field)
on the Cmd port. When command read data is output on a serial read port, the read address is put in the
most significant half of the word and the read data in the least significant half.
MSB
LSB
0
Read Address
Data
15 14
87
0
Command Read Serial Word
4.7.3 Rx Data Interface
The Rx Data interface is used only for output of the I and Q received data, unless it is operating in the mode
where CmdRd data is directed to it. When data reception is enabled, I and Q received data will be output at
either 8 x or 4 x the symbol rate, under control of command register RxSetup1. (see Section 4.8). This is
achieved by reducing the serial interface clock rate from MCLK/2 to MCLK/4 and discarding alternate data
samples under control of command registers ConfigCtrl1 and RxSetup1. 16-bit I and Q data words are
output at the Rx Data interface, I data and MSB first (by default), on the rising edge of SClk. To facilitate
channel identification of the serial data, should initial synchronization be lost, and synchronization of the
internal Tx symbol clock with received data, the CMX980A has an I/Q identification mode, which is controlled
by setting the RxIdentMode bit in the RxSetup1 Register.
2000 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. 20480201.001
4800 Bethania Station Road, Winston-Salem, NC 27105-1201, USA
All trademarks and service marks are held by their respective companies
Share Link: 