XRT7250 datasheet(74/463 Pages) EXAR

74 / 463 page

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DS3/E3 FRAMER IC

XRT7250

REV. 1.1.1

2.3.2

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.

2.3.2.1

Framer Operating Mode Register

Bit 7 - Local Loopback Mode

0x58

PMON CP Bit Error Event Count Register - MSB

b00000000

RUR

0x59

PMON CP Bit Error Event Count Register - LSB

b00000000

RUR

0x5A - 0x6B Reserved

b00000000

RUR

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 -

MSB (BIP-8 in G.832)

b00000000

R/O

0x71

Frame Parity Error One-Second Accumulator Register -

LSB (BIP-8 in G.832)

b00000000

R/O

0x72

Frame CP Bit Error - One-Second Accumulator Register -

MSB

b00000000

R/O

0x73

Frame CP Bit Error - One-Second Accumulator Register -

LSB

b00000000

R/O

0x72 - 0x7F Reserved

0x80

Line Interface Drive Register

b00001000

R/W

0x81

Line Interface Scan Register

b00000000

R/O

0x82 - 0x85 Reserved

0x86 - 0xDD Transmit LAPD Message Buffer (RAM)

bxxxxxxx

R/W

0xDE -

0x135

Receive LAPD Message Buffer (RAM)

bxxxxxxx

R/W

TABLE 4: REGISTER ADDRESSING OF THE FRAMER PROGRAMMER REGISTERS

ADDRESS

POWER UP DEFAULT VALUE

FRAMER OPERATING MODE REGISTER (ADDRESS = 0X00)

BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0

Local Loopback

DS3/E3*

Internal

LOS

Enable

RESET

Interrupt

Enable Reset

Frame Format

TimRefSel[1:0]

R/W

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