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CMX7163Q1 参数 Datasheet PDF下载

CMX7163Q1图片预览
型号: CMX7163Q1
PDF下载: 下载PDF文件 查看货源
内容描述: [Modem, VQFN-64]
分类和应用: 电信电信集成电路
文件页数/大小: 81 页 / 4386 K
品牌: CMLMICRO [ CML MICROCIRCUITS ]
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CMX7163 QAM Modem  
CMX7163  
7.4 Device Control  
Once the Function Imageis loaded the CMX7163 can be set into one of four main modes using the  
Modem Mode and Control - $6B write register:  
Idle mode for configuration or low power operation  
Transmit mode for transmission of raw or formatted data  
Receive mode for detection and reception of bursts containing raw or formatted data  
Carrier sense mode for attempting to transmit if the channel is free, otherwise continuing to  
receive  
These four modes are described in the following sections. All control is carried out over the C-BUS  
interface: either directly to operational registers in transmit, receive and carrier sense modes or, for  
parameters that are not likely to change during operation, using the Programming Register - $6A write in  
Idle mode.  
To conserve power when the device is not actively processing a signal, place the device into Idle mode.  
Additional power-saving can be achieved by disabling unused hardware blocks, however, most of the  
hardware power-saving is automatic. Note that V  
must be enabled to allow any of the Input or Output  
BIAS  
blocks to function. It is only possible to write to the Programming register whilst in Idle mode. See:  
10.1.17 Programming Register - $6A write  
10.1.18 Modem Mode and Control - $6B write  
10.2 Programming Register Operation  
10.1.24 VBIAS Control - $B7 write.  
7.4.1 Normal Operation Overview  
In normal operation (after the CMX7163 is configured) the appropriate mode must be selected and data  
provided in transmit or retrieved in receive. This process is carried out by selecting the mode (Tx, Rx or  
Carrier Sense), selecting the frame sync to use (Frame Sync 1 or 2) and selecting formatted or raw data.  
Such a selection is required at the beginning of transmission or reception of a burst.  
In transmit (or following a carrier sense period where no signal is detected on channel) the CMX7163 will  
begin by switching GPIO signals as configured by the transmit sequence. The RAMDAC can also be  
configured to ramp up at this point. Transmission then begins with preamble and the selected frame sync.  
The main payload of user data comes next, ending with selectable tail bits. The burst ends with the  
transmission sequence ramping the RAMDAC down and/or switching GPIO signals.  
In receive (or following a carrier sense period where signal is detected on channel) the CMX7163 will begin  
by searching for either or both of the configured frame sync patterns. On detection of a frame sync,  
reception and delivery of Rx data will begin. Reception continues until the CMX7163 is switched into a  
different mode, determined by the host.  
During the burst, data must be transferred into or out of the CMX7163. Transfers use the Command FIFO  
to transfer data and commands about data type into the CMX7163, and the Rx FIFO to transfer data out of  
the CMX7163. The IRQ Status register is used to indicate that the data has been dealt with. The CMX7163  
can be configured to interrupt the host when a specified data block has been transferred, or on FIFO fill  
level.  
The CMX7163 offers internal buffering of data in addition to the Command and Rx FIFOs in both receive  
and transmit directions. The amount of buffering offered is dependant on the mode in which the device is  
operating. In the process of burst transmission or reception the most significant registers are:  
10.1.18 Modem Mode and Control - $6B write  
10.1.37 IRQ Status - $7E read  
10.1.19 IRQ Mask - $6C write  
10.1.3 Modem Command FIFO Data/Control - $48, $49 and $4A write  
10.1.26 Receive FIFO Data/Control - $4C, $4D, $4E read  
10.1.25 Modem Command FIFO Level - $4B read  
10.1.27 Receive FIFO Level - $4F read.  
2014 CML Microsystems Plc  
Page 25  
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