XRT74L73 Datasheet, PDF (450/488 Pages) Exar Corporation – 3 CHANNEL, ATM UNI/PPP DS3/E3 FRAMING CONTROLLER

XRT74L73
3 CHANNEL, ATM UNI/PPP DS3/E3 FRAMING CONTROLLER
REV. P1.0.1
PRELIMINARY
FIGURE 206. THE LOCAL RECEIVE E3 FRAMER BLOCK, TRANSMITTING AN E3 FRAME TO THE REMOTE TERMINAL
WITH THE FEBE BIT WITHIN THE MA BYTE-FIELD SET TO “1”
Local Terminal
FEBE bit
x1xxxxxx
Transmit E3
Framer
Receive E3
Framer
MA Byte
Remote
Terminal
In additional to the FEBE bit-field signaling, the Re-
ceive E3 Framer block will generate the BIP-8 Error
Interrupt to the Microprocessor. Hence, it will set bit 2
(BIP-8 Error Interrupt Status) to “1”, as depicted be-
low.
RXE3 INTERRUPT STATUS REGISTER - 2 (ADDRESS = 0X15)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Not Used
TTB
Change
Interrupt
Status
Not Used
FEBE
Interrupt
Status
FERF
Interrupt
Status
BIP-8
Error
Interrupt
Status
Framing
Byte Error
Interrupt
Status
RxPld
Mis
Interrupt
Status
RO
RUR
RO
RUR
RUR
RUR
RUR
RUR
0
0
0
0
0
0
0
0
Finally, the Receive E3 Framer block will increment
the PMON Parity Error Count registers. The byte for-
mat of these registers are presented below.
PMON PARITY ERROR COUNT REGISTER - MSB (ADDRESS = 0X54)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
Parity Error Count - High Byte
RUR
RUR
RUR
RUR
RUR
RUR
0
0
0
0
0
0
BIT 1
RUR
0
BIT 0
RUR
0
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