XRT74L73 Datasheet, PDF (401/488 Pages) Exar Corporation – 3 CHANNEL, ATM UNI/PPP DS3/E3 FRAMING CONTROLLER

PRELIMINARY
XRT74L73
3 CHANNEL, ATM UNI/PPP DS3/E3 FRAMING CONTROLLER
REV. P1.0.1
TABLE 87: THE OVERHEAD BITS WITHIN THE E3 FRAME AND THEIR POTENTIAL SOURCES
OVERHEAD BIT
INTERNALLY GENERATED
ACCESSIBLE VIA THE TRANSMIT OVERHEAD
DATA INPUT INTERFACE
BUFFER/REGISTER
ACCESSIBLE
FA1 - Bit 7
Yes
No
Yes*
FA1 - Bit 6
Yes
No
Yes
FA1 - Bit 5
Yes
No
Yes*
FA1 - Bit 4
Yes
No
Yes*
FA1 - Bit 3
Yes
No
Yes
FA1 - Bit 2
Yes
No
Yes
FA1 - Bit 1
Yes
No
Yes+
FA1 - Bit 0
Yes
No
Yes
FA2 - Bit 7
Yes
No
Yes
FA2 - Bit 6
Yes
No
Yes
FA2 - Bit 5
Yes
No
Yes
FA2 - Bit 4
Yes
No
Yes
FA2 - Bit 3
Yes
No
Yes
FA2 - Bit 2
Yes
No
Yes
FA2 - Bit 1
Yes
No
Yes
FA2 - Bit 0
Yes
No
Yes
EM - Bit 7
Yes
Yes
Yes
EM - Bit 6
Yes
Yes
Yes
EM - Bit 5
Yes
Yes
Yes
EM - Bit 4
Yes
Yes
Yes
EM - Bit 3
Yes
Yes
Yes
EM - Bit 2
Yes
Yes
Yes
EM - Bit 1
Yes
Yes
Yes
EM - Bit 0
Yes
Yes
Yes
TR - Bit 7
No
Yes
Yes
TR - Bit 6
No
Yes
Yes
TR - Bit 5
No
Yes
Yes
TR - Bit 4
No
Yes
Yes
TR - Bit 3
No
Yes
Yes
TR - Bit 2
No
Yes
Yes
TR - Bit 1
No
Yes
Yes
402