GDI COMMUNICATIONS Extreme Copper XC-RP300, Руководство пользователя

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VOC channel access
The remote modem can be accessed via the VDSL operating channel (VOC).
Therefore, the VDSL Manager User’s Manual has special VOC registers, which have to be
used.
The VOC protocol consists of following steps:
1. Check MS_TXCMD register.
The MS_TXCMD register has to equal zero, which indicates that the internal processor is
ready for a new VOC operation.
2. Write appropriate data to the VOC message registers.
The VOC registers have to be loaded with the appropriate VOC message. The message
characteristics contain the address of the remote register, data to write to the remote register
(if required), number of bytes to transfer and the message ID.
3. The VOC operation has to be started by loading the MS_TXCMD register with the
appropriate command (e.g. read or write). Once the internal processor sees a change in the
MS_TXCMD register, it sends the message over the VDSL link via the VOC.
4. Poll MS_RXSTAT register for message acknowledge. The message status register
MS_RXSTAT has to be monitored in order to check for acknowledge and type of received
messages.
This protocol is implemented in the VDSL Manager for accessing the remote modem. For more
detailed information please refer to the VDSL Modem User’s Manual data sheet.
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