XRT72L56 Datasheet, PDF (87/486 Pages) Exar Corporation – SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

áç
SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
PRELIMINARY
XRT72L56
REV. P1.1.2
TABLE 5: REGISTER ADDRESSING OF THE FRAMER PROGRAMMER REGISTERS
ADDRESS
REGISTER NAME
POWER UP DEFAULT VALUE REGISTER TYPE
0x6A-0x6B Reserved
b00000000
R/O
0x6C PMON Holding Register
b00000000
RUR
0x6D One-Second Error Status Register
b00000000
R/O
0x6E LCV One-Second Accumulator Register - MSB
b00000000
R/O
0x6F LCV One-Second Accumulator Register - LSB
b00000000
R/O
0x70 Frame Parity Error One-Second Accumulator Register -
b00000000
R/O
MSB (BIP-8 in G.832)
0x71 Frame Parity Error One-Second Accumulator Register -
b00000000
R/O
LSB (BIP-8 in G.832)
0x72 Frame CP Bit Error - One-Second Accumulator Register -
b00000000
R/O
MSB
0x73 Frame CP Bit Error - One-Second Accumulator Register -
b00000000
R/O
LSB
0x74 - 0x7F Reserved
0x80 Line Interface Drive Register
b00001000
R/W
0x81 Line Interface Scan Register
b00000000
R/O
0x82 HDLC Control Register
b00000000
R/W
0x83 - 0x85 Reserved
0x86 - 0xDD Transmit LAPD Message Buffer (RAM)
bxxxxxxx
R/W
0xDE - Receive LAPD Message Buffer (RAM)
0x135
bxxxxxxx
R/W
2.4.2 Framer Register Description
This section provides a function description of each
bit-field within each of the on-chip Framer Registers.
NOTE: For all on-chip registers, a table containing the bit-
format of the register is presented. Additionally, these
tables also contain the default values for each of these reg-
ister bits. Finally, the functional description, associated with
each register bit-field is presented, along with a reference to
a Section Number, within this Data Sheet, that provides a
more in-depth discussion of the functions associated with
this register bit-field.
2.4.2.1 Framer Operating Mode Register
FRAMER OPERATING MODE REGISTER (ADDRESS = 0X00)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Local Loopback DS3/E3*
Internal
LOS
Enable
RESET
Interrupt
Enable Reset
Frame Format
TimRefSel[1:0]
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
1
0
1
0
1
1
Bit 7 - Local Loopback Mode
This Read/Write bit-field permits the user to com-
mand the Framer chip to operate in the Local Loop-
back Mode.
68