PM8313 datasheet(140/192 Pages) PMC

140 / 192 page

PM8313 D3MX

DATA SHEET

PMC-920702

ISSUE 5

M13 MULTIPLEXER

130

Registers 4BH, 5BH, 6BH, 7BH, 8BH, 9BH and ABH: MX12 Loopback

Activate Register

Bit

Type

Function

Default

Bit7

R/W

ILBR[4]

Bit6

R/W

ILBR[3]

Bit5

R/W

ILBR[2]

Bit4

R/W

ILBR[1]

Bit3

R/W

LBA[4]

Bit2

R/W

LBA[3]

Bit1

R/W

LBA[2]

Bit0

R/W

LBA[1]

LBA[4:1]:

Setting any of the LBA[4:1] bits activates loopback of the corresponding low

speed stream from the high speed input signal to the high speed output

signal. LBA[4] has no effect in G.747 mode, but LBA[3:1] activates the

loopback of the corresponding 2048 kbit/s signal.

The demultiplexed DS1 signals continue to present valid payloads while

loopbacks are activated. The MX12 AIS Insert Register allows insertion of

DS1 AIS if required.

ILBR[4:1]

In DS2 mode, setting any of the ILBR[4:1] bits enables the insertion of a

loopback request in the corresponding DS1 stream in the DS2 output signal.

The format of the loopback request is determined by the LBCODE[1:0] bits in

the Loopback Code Select MX12 Register. In G.747 mode, ILBR[j] inverts bit

Cj1, Cj2 or Cj3 in the G.747 frame in an analogous fashion.

PM8313 Datasheet(PDF) 140 Page - PMC-Sierra, Inc

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