CMX969 Consumer Microcircuits Limited, CMX969 Datasheet - Page 23

• Manufacturer Part Number: CMX969
• Description: RD-LAP/MDC4800/Motient/ARDIS4-Level FSK Packet Data Modem
• Manufacturer: Consumer Microcircuits Limited

RD-LAP/MDC4800 Motient/ARDIS
CMX969
RSID: Read Station ID (RD-LAP only)
This task causes the modem to read in and decode the following 23 symbols as Station ID data followed by an
'S' symbol. It is similar to the last two parts of a SFP task except that it will not re-start if the received CRC0 is
incorrect. It would normally follow a SFS task.
The 3 decoded bytes will be placed into the Data Block Buffer, and the CRCERR bit of the Status Register set
to '1' if the received CRC0 was incorrect, otherwise it will be cleared to '0'. The SVAL bits of the Status
Register will be updated and the BFREE, SRDY and IRQ bits set to '1' to indicate that the µC may read the 3
received bytes from the Data Block Buffer and write the next task to the modem's Command Register.
RESET: Stop any current action.
This ‘task’ is similar to the Transmit mode RESET task. It takes effect immediately, and terminates any
current task the modem may be performing and sets the BFREE bit of the Status Register to ‘1’, without
setting the IRQ bit. Writing a RESET task to the CMX969 also resets an internal received signal buffer
memory used by AFSD function, so that if a RESET task is written while the CMX969 is receiving a Frame
Sync pattern then that pattern will not be recognised by the AFSD function.
Task Timings
Figure 9 Transmit Task Timing Diagram
2001 Consumer Microcircuits Limited
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