XRT72L13 datasheet(105/370 Pages) EXAR

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M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

XRT72L13

PRELIMINARY

REV. 1.0.6

ticular bit-field permits the user to define the “Frame

Maintenance” criteria, as it applies to F-bits.

Setting this bit-field to “0” configures the “Receive

DS3 Framer” block to declare an “OOF” (Out of

Frame” condition) if it determines that 6 out of the last

16 F-bits are in error.

Setting this bit-field to “1” configures the “Receive

DS3 Framer” block to declare an “OOF” (Out of

Frame” condition) if it determines that 3 out of the last

16 F-bits are in error.

Bit 0 - MSync Algo(rithm) Select

This “Read/Write” bit-field, in conjunction with Bits 1

and 2 of this register, allows the user to completely

define the “Frame Maintenance” criteria of the “Re-

ceive DS3 Framer” block (within the chip). This par-

ticular bit-field permits the user to define the “Frame

Maintenance” criteria, as it applies to M-bits.

Setting this bit-field to “0” configures the “Receive

DS3 Framer” block to ignore the occurrence of M-bit

errors.

Setting this bit-field to “1” configures the “Receive

DS3 Framer” block to declare an “OOF” condition if it

determines that 3 out of 4 M-bits are in error.

2.3.2.16

RxDS3 Status Register

Bit 4 - RxFERF (Far-End Receive Failure) Indicator

This “Read-Only” bit-field indicates whether or not the

“Receive DS3 Framer” block (within the XRT72L13

M13 device) is declaring a FERF (Far-End Receive

Failure) condition.

If this bit-field is set to “0”, then the “Receive DS3

Framer” block (of the chip) is currently not declaring a

FERF condition.

Conversely, if this bit-field is set to “1”, then the “Re-

ceive DS3 Framer” block is currently declaring a

FERF condition.

NOTE: For more information how the “Receive DS3 Framer”

block declares a “FERF” condition, please see Section _.

Bit 3 - RxAIC (Application Identification Channel)

indicator

This “Read-Only” bit-field reflects the value of the AIC

bit-field, within the most recently received DS3

frames, as detected by the “Receive DS3 Framer”

block.

This bit-field is set to “1” if the incoming DS3 data

stream is determined to be in the “C-bit Parity” format

(AIC bit = 1) for at least 63 consecutive frames.

This bit-field is set to “0” if the incoming DS3 data

stream is determined to be in the “M13” format (AIC

bit = 0).

Bits 2 thru 0 - RxFEBE[2:0]

These “Read-Only” bit-fields reflect the “FEBE” (Far-

End Block Error) value, within the most recently re-

ceived DS3 frame.

If these bit-fields are set to “111”, then it indicates that

the “Remote” Receiving Terminal is receiving DS3

frames in an un-erred manner.

Conversely, if these bit-fields are set to any value oth-

er than “111”, then it indicates that the “Remote” Re-

ceiving Terminal has detected Framing or Parity bit

errors in the DS3 frames that it is receiving.

NOTE: For more information on FEBE (Far-End-Block

Error), please see Section _.

RX DS3 STATUS REGISTER (ADDRESS = 0X11)

BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0

Not Used

RxFERF

RxAIC

RxFEBE[2]

RxFEBE[1]

RxFEBE[0]

R/O

R/W

R/O

0000

000

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