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CS62180A-IP

T1 Framer

Cirrus Logic 

CS62180A

CS62180B

193S Yellow Alarm Format

CCR.3: YELS

The CS62180A and CS62180B supports two dif-

ferent 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 (2nd 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. Note that in the CS62180A,

CCR.7 must be set to "0", and the SLC-96® and

T1DM formats are not available. 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.

193E Yellow Alarm Format

CCR.5: EYELMD

The CS62180A and CS62180B supports two dif-

ferent 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

(2nd 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.

7

FM1

0

0

1

1

4

FM

0

1

0

1

Format Selected

193S (D4)

193E (ESF)

SLC-96 (CS62180B only)

T1DM (CS62180B only)

Figure 4b. Framing Format Selection

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.

DS225PP1

11

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