28953-DSH-001-A Datasheet, PDF(116/173 Page) M/A-COM Technology Solutions, Inc.

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28953-DSH-001-A Datasheet, PDF (116/173 Pages) M/A-COM Technology Solutions, Inc. – HDSL Channel Unit

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4.0 Registers

4.11 Common Command

0xF3âCommand Register 6 (CMD_6)

RS8953B/8953SPB

HDSL Channel Unit

RAZ_[1:3]

RAUX_EN

RSIG_EN MSYNC_MEAS

BER_SEL[1:0]

MSYNC_MEAS

RSIG_EN

RAUX_EN

RAZ_1âRAZ_3

BER/PRBS ModeâSelects the BER meter source, the PRBS generator output direction, and

serial or framed data formats. Refer to Figure 3-12.

BER_SEL Mode

Mode Description

Normal PRBS outputs data under control of ROUTE_TBL.

BER monitors data selected by COMBINE_TBL.

Reserved

10 PCM Framed PRBS outputs data under control of ROUTE_TBL.

BER monitors TSER during the same timeslots

selected by ROUTE_TBL. TCLK and RCLK must

be identical. If accompanied by loopback on HDSL

side, framed PCM channels are tested.

PCM Serial PRBS output replaces RSER data. BER monitors

all data at TSER. TCLK and RCLK must be

identical.

MSYNC Phase MeasurementâSelects whether TMSYNC or RMSYNC phase is measured

with respect to MSYNC. The result is reported in MSYNC_PHS [addr 0x39].

0 = TMSYNC to MSYNC phase measurement

1 = RMSYNC to MSYNC phase measurement

Receive Signaling Table EnableâApplicable only for an LTU in a P2MP application. When

active, the Receive Signaling Table [RSIG_TBL; addr 0xF2] grooms the ABCD signaling

from two or three remote sites and routes the groomed signal via DBANK_3 in the receive

Combination Table [COMBINE_TBL; addr 0xEE]. When inactive, RSIG_TBL is unused and

the receive combination table regains use of DBANK_3.

0 = Normal receive

1 = Enable receive signaling table

Receive Auxiliary EnableâThe RAUX1âRAUX3 outputs share the same pins with DROP,

INSERT, and MSYNC, respectively. RAUX_EN determines which signals are output on these

shared pins.

0 = DROP, INSERT, or MSYNC outputs enabled

1 = RAUXn outputs enabled

Receive Auxiliary Z-bit EnableâApplicable only when RAUX_EN is active. RAZn

(n = 1,2,3) selects whether ROHn marks the output of all overhead and Z-bits or the output of

only the last 40 Z-bits. If enabled, ROHn is high for one BCLKn, coincident with each of the

last 40 Z-bits output on RAUXn. Otherwise, all data passed into the RFIFO is marked high by

ROHn.

0 = ROHn marks all non-payload data

1 = ROHn marks only the last 40 Z-bits

4-48

Conexant

N8953BDSB

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