XRT72L56 Datasheet, PDF (152/486 Pages) Exar Corporation – SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

XRT72L56 SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.2
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PRELIMINARY
TABLE 6: LIST OF ALL OF THE POSSIBLE CONDITIONS THAT CAN GENERATE INTERRUPTS WITHIN EACH CHANNEL OF
THE XRT72L56 FRAMER DEVICE
FUNCTION SECTION
INTERRUPTING CONDITION
Transmit Section
FEAC Message Transfer Complete (DS3, C-Bit Parity Only)
LAPD Message frame Transfer Complete (DS3, C-Bit Parity, All E3)
Receive Section
Change of Status on Receive LOS, OOF, AIS Idle Detection
Validation and removal of received FEAC Code (DS3, C-Bit Parity Only)
New PMDL Message in Receive LAPD Message Buffer.
Detection of Parity Errors (e.g., P-Bit, CP-Bit, BIP-4 and BIP-8 Errors)
Detection of Framing Bit/Byte Errors.
Framer Chip Level One-Second Interrupt
Each of the three channels, within the XRT72L56
Framer device contains an Interrupt Block that comes
equipped with the following registers to support the
servicing of these potential interrupt request sources.
Table 7, 8 , and 9 lists these registers, and their ad-
dresses, within the Framer IC for DS3, E3 (ITU-T
G.832) and E3 (ITU-T G.751) framing formats.
TABLE 7: A LISTING OF THE XRT72L56 FRAMER DEVICE INTERRUPT BLOCK REGISTERS (FOR DS3 APPLICATIONS)
ADDRESS LOCATION
REGISTER NAME
0 x 04
Block Interrupt Enable Register
0 x 05
Block Interrupt Status Register
0 x 12
RxDS3 Interrupt Enable Register
0 x 13
RxDS3 Interrupt Status Register
0 x 17
RxDS3 FEAC Interrupt Enable/Status Register
0 x 18
RxDS3 LAPD Control Register
0 x 31
TxDS3 FEAC Configuration and Status Register
0 x 34
TxDS3 LAPD Status/Interrupt Register
TABLE 8: A LISTING OF THE XRT72L56 FRAMER DEVICE INTERRUPT BLOCK REGISTERS (FOR E3, ITU-T G.832
APPLICATIONS)
ADDRESS LOCATION
REGISTER NAME
0 x 04
Block Interrupt Enable Register
0 x 05
Block Interrupt Status Register
0 x 12
RxE3 Interrupt Enable Register -1
0 x 13
RxE3 Interrupt Enable Register -2
0 x 14
RxE3 Interrupt Status Register - 1
0 x 15
RxE3 Interrupt Status Register - 2
0 x 18
RxE3 LAPD Control Register
0 x 34
TxE3 LAPD Status/Interrupt Status
133