STLC5412 datasheet(26/74 Pages) STMICROELECTRONICS

26 / 74 page

If not programmed this bit is inactive. The relock

will take place only after completion of present

monitor transfer. (EOM received). This locking will

cause a phase jump of FSa and BCLK signals. To

avoid problems on the GCI bus that is synchro-

nized by FSa, a number of 5 GCI frames after the

phase jump will be ignored by the STLC5412.

For proper system operation before writing the

LOCK bit in CR7 register, the MOB bit (Mask

Overhead Bits) in CR4 register should be set to 1

to avoid spontaneous monitor message genera-

tion from STLC5412. Following the relocking the

MOB bit should be set back to desired value after

a minimum time to be defined (ex. 1msec).

The suggestedprocedure is to program the LOCK bit

in CR7 register after the AI indication from

STLC5412. In this case the system controller knows

when the phase jump takes place and can reset the

transmission/receptionof the GCI controller.

Notes:

The DECT EOC message reception generates an

interrupt as a normal EOC message according to

the rules stored in OPR register. The DECT sync

message must be checked 3 times (reset value

of OPR register). If it is not detected 3 times iden-

tical no pulse is generated. The DECT pulse

width on output pin SFSx is 6msec.

MAINTENANCE FUNCTIONS

M channel

In each frame there are 6 ”overhead” bits assigned

to various control and maintenance functions.

Some programmable processing of these bits is

provided on chip while interaction with an external

controller provides the flexibility to take full advan-

tage of the maintenance channels. See OPR,

TXM4, TXM56, TXEOC, RXM4, RXM56, RXEOC

TX EOC

SFSx

n*12ms (n=40 minimum)

6ms

DECT DECT DECT

txeoc

DECT

LT DECT MODE

NT DECT MODE

SFSx

n*12ms

RX EOC

12 ms

SFSr

RXEOC INT

6ms

DECT DECT

DECT

rxeoc

DECT

36ms + line delay

TIMING DIAGRAMS FOR DECT

STLC5412

26/74

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