XRT73L06 Datasheet, PDF (57/63 Pages) Exar Corporation – SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT

SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT73L06
REV. 1.0.2
TABLE 18: REGISTER MAP DESCRIPTION - CHANNEL N
ADDRESS
(HEX)
TYPE
REGISTER
NAME
BIT#
SYMBOL
DESCRIPTION
DEFAULT
VALUE
D0 SR/DR_n Setting this bit configures the Receiver and Trans-
0
mitter in Single-Rail (NRZ) mode.
NOTE: See section 4.0 for detailed description.
D1 STS-1/ Setting this bit configures the channel into STS-1
0
DS3_n mode.
NOTE: This bit field is ignored if the channel is con-
figured to operate in E3 mode.
D2
E3_n Setting this bit configures the channel in E3 mode.
0
0x06 (Ch 0) R/W Block Con- ^D3
LLB_n Setting this bit configures the channel in Local Loop-
0
0x16 (Ch 1)
trol
back mode.
0x26 (Ch 2)
0x36 (ch 3)
0x46 (ch 4)
D4
RLB_n This bit along with LLB_n determine the diagnostic
0
mode as shown in the table below.
0x56 (ch 5)
RLB_n
LLB_n
Loopback Mode
0
0
Normal Operation
0
1
Analog Local
1
0
Remote
1
1
Digital
D5 PRBSEN_ Setting this bit enables the PRBS generator/detec-
0
n
tor. When in E3 mode, an unframed 2²³-1 pattern is
used. For DS3 and STS-1, unframed 2¹⁵-1 pattern is
used. This mode of operation will use TCLK for tim-
ing. One should insure that a stable frequency is
provided. Looping this signal back to its own receive
channel and using RCLK to generate TCLK will
cause an unstable condition and should be avoided.
D6 CLKOUTE Set this bit to enable the CLKOUTs on a per channel
0
N_n basis. The frequency of the output clock is depen-
dent on the configuration of the channels, either E3,
DS3 or STS-1.
D7
Reserved
54