CMX989 Datasheet, PDF (19/31 Pages) CML Microcircuits – CDPD MAC and Data Pump Processor

CDPD MAC and Data Pump Processor
CMX989
RX ERROR DATA Register (Hex address $04)
This is a read-only register that contains receiver performance data.
CORRECTED
ERRORS
(Bits 7, 6, 5 and 4)
This 4-bit number indicates the number of Reed-Solomon symbol errors before error
correction that are in the most recently received 63-symbol Reed-Solomon block.
They are updated every time the SYNCF bit is set in the IRQ FLAGS register. Bit 7
is the msb.
OVER8
(Bit 3)
This bit is set to "1" if the most recently received Reed-Solomon block has greater
than 8 errors. i.e. the data has too many errors to enable the Reed-Solomon error
correction to work. It is updated every time the SYNCF bit is set in the IRQ FLAGS
register and is reset to "0" if 8 errors or fewer are encountered.
SYNC ERRORS
(Bits 2, 1 and 0)
This 3-bit number indicates the number of errors in the most recently received
synchronisation word. It is updated whenever the synchronisation word is in error
less than or equal to the number specified by the SYNC ERROR LIMIT bits of the
RX CONTROL register. It also implies the synchronisation word has been received
successfully and sets the SYNC bit to “1” (See STATUS register above). Bit 2 is the
msb.
Note: These bits all refer to the data most recently received at the Rx input and are NOT
necessarily the same as previously received and buffered data which is currently being
read by the CMX989's host µController.
© 2001 Consumer Microcircuits Limited
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