MK50H27 데이터 시트보기 (PDF) - STMicroelectronics

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MK50H27

Signalling System 7 Link Controller

STMicroelectronics 

and receiver descriptor rings, etc. The starting

address for the Initialization block, IADR, is de-

fined in the CSR2 and CSR3 registers inside the

MK50H27.

3.2.3 Signal Unit Repertoire

The frame format supported by the MK50H27 is

shown in Table A. Each signal unit (SU) may

consist of a programmable number of leading flag

patterns (01111110), Backward Sequence Num-

ber, Backward Indicator Bit, Forward Sequence

Number, Forward Indicator Bit, Lenght Indicator

Field, followed by Signalling Information Octet,

Service Information Field, or Status Field, de-

pending on SU type, and then ended with a CK

(CRC) of either 16 or 32 bits, and a trailing flag

pattern. The number of leading flags transmitted

is programmable through the Mode Register in

the Initialization Block. Received signal units may

have as few as one flag between adjacent signal

units

The symbols and definitions for the signal unit

types handled by the MK50H27 are:

TABLE A - MK50H27 Signal Unit Repertoire

NAME

MSU

LSSU

FISU

F

FSN

BSN

FIB

BIB

LI

X

PRI

SIO

SIF

SF

CK

MK50H27

DEFINITION

Message Signal Unit

Link Status Signal Unit

Fill In Signal Unit

Flag Sequence (01111110)

Forward Sequence Number

Backward Sequence Number

Forward Indicator Bit

Backward Indicator Bit

Lenght Indicator

Reserved - programmed as zeroes

Priority Indication (JT-Q703 only)

Signalling Information Octe

Service Information Field

Status Field

Check bit Sequence (CRC)

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