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| PM4341AT1XC Datasheet, PDF (244/288 Pages) PMC-Sierra, Inc – SINGLE DSX-1 TRANSCEIVER DEVICE | |||
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DATA SHEET
PMC-900602
ISSUE 7
Figure 40 - Line Loopback
XPLS
DJAT
PM4341A T1XC
T1 FRAMER/TRANSCEIVER
XBAS
BTSIG
BTPCM
BTCLK
BTFP
RSLC
CDRC
RP
RN
RPCM
RCLK
ELST
FRMR
BRFPI
BRCLK
BRPCM
13.4.3 Diagnostic Digital Loopback
When Diagnostic Digital loopback (DDLB) is initiated by writing 04H to the
Master Diagnostics Register (0AH), the T1XC is configured to internally connect
the dual-rail positive and negative data pulses output from DJAT to the dual-rail
inputs of CDRC. As a result, if DDLB is to be used, TUNI must be set to logic 0
in the Transmit Interface Configuration register (04H) and RUNI must be set to
logic 0 in the Receive Interface Configuration register (03H). Conceptually, the
data flow through T1XC in this loopback condition can be shown as follows:
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERSâ INTERNAL USE 226
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