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CS62180B Datasheet(PDF) 11 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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193S Yellow Alarm Format
CCR.3: YELS
The CS62180B supports two different
yellow alarm formats for 193S framing.
Whichever format is selected, it will be used by
both the transmit side, for yellow alarm genera-
tion, and the receive side, for alarm detection.
When using 193S framing, a "0" in YELS
(CCR.3) will encode/decode yellow alarms as a
"0" in bit 2 (2
nd MSB) of all channels. Setting
CCR.3 to "1" will cause yellow alarms to be en-
coded/decoded as a "1" is the S-bit position of
frame 12.
Note: For T1DM and SLC-96
®, CCR.3 should
be set to a "0".
Framing Format
CCR.4: FM
CCR.7: FM1
As shown in Figure 4b, CCR.4 and CCR.7 select
the framing format.
See the text for
the Transmit Control Register (TCR) and Re-
ceive Control Register (RCR) for further
information on the particular options available
for each framing format.
Note:
Changing the framing mode does not
force the receiver to resynchronize. A forced
resync should be done to insure correct receiver
synchronization after the framing mode is
changed.
193E Yellow Alarm Format
CCR.5: EYELMD
The CS62180B supports two different
yellow alarm formats for 193E framing.
Whichever format is selected, it will be used by
both the transmit side, for yellow alarm genera-
tion, and the receive side, for alarm detection.
When using 193E framing, a "0" in EYELMD
(CCR.5) will encode/decode yellow alarms as a
repeating sequence of 00FF (hex) on the 4 kHz
facility data link (FDL). If CCR.5 is set, 193E
yellow alarms will be handled as a "0" in bit 2
(2
nd MSB) of all channels.
Control of RSR.2
CCR.6: FRSR2
CCR.6 allows you to change the meaning of D2
in the Receive Status Register (RSR.2). If CCR.6
is clear, RSR.2 will report the detection of B8ZS
codes in the received T1 input. If CCR.6 is set to
a "1", RSR.2 will be used to signal a Change of
Frame Alignment (COFA). A COFA is reported
when the last receiver resync resulted in a
change of framing or multiframing alignment.
Refer to the description of the Receive Status
Register for further information.
74
FM1
FM
Format Selected
0
0
193S (D4)
0
1
193E (ESF)
1
0
SLC-96
1
1
T1DM
Figure 4b. Framing Format Selection
CS62180B
DS225PP2
11




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