XRT72L50 Datasheet, PDF (374/471 Pages) Exar Corporation – SINGLE CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

XRT72L50
SINGLE CHANNEL DS3/E3 FRAMER WITH HDLC CONTROLLER
REV. 1.2.1
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TABLE 68: A LISTING OF THE OVERHEAD BITS WITHIN THE E3 FRAME, AND THEIR POTENTIAL SOURCES, WITHIN THE
XRT72L50 IC
OVERHEAD BIT
FA1 - Bit 7
INTERNALLY GENERATED
Yes
ACCESSIBLE VIA THE TRANSMIT OVERHEAD
DATA INPUT INTERFACE
No
BUFFER/REGISTER
ACCESSIBLE
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
No
Yes
EM - Bit 6
Yes
No
Yes
EM - Bit 5
Yes
No
Yes
EM - Bit 4
Yes
No
Yes
EM - Bit 3
Yes
No
Yes
EM - Bit 2
Yes
No
Yes
EM - Bit 1
Yes
No
Yes
EM - Bit 0
Yes
No
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
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