CS62180 datasheet(28/50 Pages) CIRRUS

28 / 50 page

is correct. Since the frame alignment is correct

no OOF event or auto resync occurs. A forced

resync will force the 62180B to synchronize to

the frame and multiframe alignment.

T1DM Resync

Resync is based upon the 6-bit sync word in

channel 24. Once the sync word is recognized,

6 consecutive frames with the correct sync word

and FS/FT bits are required before declaring syn-

chronization. RCR.2 must be set to "0". RCR.3

is ignored. When frame synchronization is de-

clared, RLOS goes low and RFSYNC is output

concurrent with the f-bits. However, the super-

frame output clocks (RMSYNC, RSIGFR and

RSIGSEL) are held low for an additional short

period of time until superframe synchronization

is found.

Receive Status Register (RSR)

The CS62180B monitors the incoming

T1 data for a number of error conditions.

These alarms are recorded in the Receive Status

status pins: RYEL, RCL, RBV, RFER, and

RLOS. Three presettable counters are provided

which count the number of occurrences of Bipo-

lar Violations, Framing and CRC errors. The

Receive Interrupt Mask Register, RIMR, can be

set to specify which of the eight errors recorded

in the RSR will generate a hardware interrupt on

INT. When operating in hardware mode, all

these registers are cleared, and only the status

pins provide real time alarm information.

"0" "0" "0" "1"

Resync

Loss of Carrier

(32nd or 128th "0")

Resync

OOF

Loss of Carrier (RCL)

Bipolar Violation

CRC Error

RCLK

RSER

RMSYNC

RFSYNC

RFER

RBV

RCL

RLOS

Reframed

Errored F-bit

2nd Frame

Bipolar Violation

Figure 22. Receive Status Pin Timing

(MSB)

43210

(LSB)

BVCS

ECS

RYEL

RCL

FERR

B8ZSD

RBL

RLOS

1 =

BVCR

Saturation

ECR

Saturation

Yellow Alarm

Detected

Carrier Loss

Detected

Frame Error

Detected

B8ZS/COFA

Detected

Blue Alarm

Detected

Resync in

progress

Figure 21. Receive Status Register (RSR)

CS62180B

DS225PP2

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