PM5347 datasheet(36/302 Pages) PMC

36 / 302 page

PM5347 S/UNI-PLUS

DATA SHEET

PMC-941033

ISSUE 6

SATURN USER NETWORK INTERFACE PLUS

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

Pin Name

Type

No.

Function

PRDI

Output

179

The path remote defect indication (PRDI) signal is

set high when path RDI is declared. This occurs

when bit 5 of the path status byte (G1) is set high

for five or ten consecutive frames. Path RDI is

removed when bit 5 of the G1 byte is set low for

five or ten consecutive frames (as selected in the

RPOP Pointer MSB and RDI Filter Control

via register access. PRDI is updated on the falling

edge of GROCLK.

LCD

Output

181

The loss of cell delineation (LCD) signal indicates

when cell delineation can not be found. LCD

transitions high when an out of cell delineation

(OCD) anomaly has persisted for 4 ms. Once

asserted, LCD remains high until no OCD

anomaly has been detected for 4 ms at which

time, LCD is set low. The OCD state is entered

when the cell delineation state machine is not in

the SYNC state. Please refer to the Functional

Description section for an explanation of the cell

delineation state machine.

This alarm indication is also available via register

access. LCD is updated on the falling edge of

GROCLK.

TLAIS

Input

The active high transmit line alarm indication

(TLAIS) signal controls the insertion of line AIS.

Line AIS is inserted by overwriting the

SONET/SDH frame contents with all ones (before

scrambling). The section overhead is not

overwritten. This function can also be performed

via register access. Line AIS insertion is internally

synchronized to frame boundaries. The TLAIS

input takes precedence over the TTOH and

TTOHEN inputs. TLAIS is sampled on the rising

edge of GTOCLK.

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