PM8313 datasheet(125/192 Pages) PMC

125 / 192 page

PM8313 D3MX

DATA SHEET

PMC-920702

ISSUE 5

M13 MULTIPLEXER

115

Registers 40H, 50H, 60H, 70H, 80H, 90H and A0H: DS2 FRMR Configuration

Bit

Type

Function

Default

Bit7

R/W

G747

Bit6

Unused

Bit5

R/W

WORD

Bit4

R/W

M2O5

Bit3

R/W

MBDIS

Bit2

R/W

REFR

Bit1

Unused

Bit0

Unused

REFR:

The REFR bit is used to trigger reframing. If a logic 1 is written to REFR

when it was previously logic 0, the FRMR is forced out-of-frame, and a new

search for frame alignment is initiated. Note that only a low-to-high transition

of the REFR bit triggers reframing; multiple write operations are required to

ensure such a transition.

MBDIS:

The MBDIS bit disables the declaration of out-of-frame upon excessive M-bit

errors. If MBDIS is a logic 0, out-of-frame is declared when one or more M-

bit errors are detected in 3 out of 4 consecutive M-frames. If MBDIS is a logic

1, the state of the M-bits is ignored once in frame. Regardless of the state of

the MBDIS bit, the F-bits are always monitored for invalid framing.

M2O5:

The M2O5 bit selects the error ratio for declaring out-of-frame (OOF) when in

DS2 mode only. When a 1 is written to M2O5, the framer declares OOF when

2 F-bit errors out of 5 consecutive F-bits are observed. When a 0 is written,

the framer declares OOF when 2 F-bit errors out of 4 consecutive F-bits are

observed. (These two ratios are recommended in TR-TSY-000009 Section

4.1.2) When the FRMR is configured for G.747 operation (the G747 bit is set

to logic 1), the OOF status is declared when 4 consecutive framing word

errors occur (as per CCITT Rec. G747 Section 4), regardless of the M2O5 bit

setting.

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