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CS62180B Datasheet(PDF) 10 Page - Cirrus Logic

Part No. CS62180B
Description  T1 FRAMER
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Maker  CIRRUS [Cirrus Logic]
Homepage  http://www.cirrus.com
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Common Control Register
The Common Control Register (CCR) deter-
mines global operating characteristics common
to both the transmitter and receiver. It currently
provides for selection of the framing mode
(193S, 193E, SLC-96
® or T1DM), the format of
yellow alarms, the zero suppression format (B7
or B8ZS), loopback operation, and control of
output to RSR.2.
See Figure 4a for an overview of the CCR.
Loopback
CCR.0: LPBK
S e t tin g LP BK (CCR. 0) to "1 " puts the
CS62180B into loopback mode.
While in loopback, the TPOS/TNEG and TCLK
outputs are internally rerouted directly to the
RPOS/RNEG and RCLK inputs, while an un-
framed, all "1’s" stream is output on the
TPOS/TNEG pins. All operating modes, except
blue alarm transmission, remain functional dur-
ing loopback. Note that enabling loopback will
usually invoke an out-of-frame (OOF) error un-
til the receiver can resync to the new framing
alignment. See the section on the Receive Con-
trol Register (RCR) for a description of the
resync options available.
Zero Suppression
CCR.1: B7
CCR.2: B8ZS
B7 and B8ZS select the zero suppression mode.
Setting B7 (CCR.1) to "1" will enable bit 7
zero substitution. This causes any channel word
with all zeros to be transmitted with bit 7 (2
nd
LSB) forced to a "1". B7 mode only affects the
transmitter, the receiver does not decode B7.
Note that bit 7 stuffing can be disabled on an
individual channel basis for clear channel trans-
mission via the Transmit Transparent Registers
TTR1 - TTR3 (see description of transmitter
which follows).
B8ZS coding operates independent of channel
boundaries, and is transparent to all other func-
tions. When using B8ZS, the final transmission
stream is examined before transmission, and
any eight consecutive zeros will be replaced
with a B8ZS code word before transmission.
If B8ZS (CCR.2) is set to a
"1", B8ZS zero substitution will be enabled in
the transmitter. Independent of the setting of
CCR.2, any incoming B8ZS codes will be inter-
cepted by the receiver and replaced with 8
zeros before being processed by the rest of the
receive side. The receiver is always capable of
receving either AMI or B8ZS encoded data.
Note: For T1DM, CCR.1 and CCR.2 should be
set to a "0" since DDS
® equipment assures a 1-
in-8 one’s density.
7
(MSB)
654321
0
(LSB)
FM1
FRSR2 EYELMD
FM
YELS
B8ZS
B7
LPBK
See Fig. 4b
0B8ZS
0
FDL
See Fig. 4b
0
Bit 2
0
Disable
0 Transparent 0
Normal
1
COFA
1
Bit 2
1
S-bit
1
Enable
1 B7 Stuffing 1
Loopback
Figure 4a. Common Control Register (CCR)
CS62180B
10
DS225PP2




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