ST5451 Ver la hoja de datos (PDF) - STMicroelectronics

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ST5451

ISDN HDLC AND GCI CONTROLLER

STMicroelectronics 

CAC

NHF

FLA

Channel Activation

CAC = 1 : Activate RX and TX

CAC = 0 : deactivate RX and TX

HDLC Function Select

NHF = 1 : disable HDLC function

Flag

FLA = 1 : transmit shared flags

FLA = 0 : transmit two flags between

consecutive frames.

ST5451

MONX1 Monitor Transmit Register 1

After reset FFH

(GCI only)

M1 M2 M3 M4 M5 M6 M7 M8

The value written in MONX1 is trans-

mitted in the outgoing Monitor channel

according to GCI transfer protocol.

XMR1 interrupt indicates when MONX1

is again available.

RFBC Receive Frame Byte Counter

After reset 00

RDC7 RDC6 RDC5 RDC4 RDC3 RDC2 RDC1 RDC0

RDC 0/7 Receive Data Count

Total number of bytes of received

frame without CRC.

RDC 0/4 Indicate the number of bytes in the cur-

rent block available in RFIFO.

RDC 5/7 Indicate the number of 32 bytes blocks

received. If the frame exceeds 223

bytes, RDC 5/7 hold the value ”111”,

only RDC 4/0 continue to count modulo

32.

See Table 3.

The contents of the register are valid after an

RME interrupt. The µP must read N+1 bytes to

transfer the number of bytes received and the

status byte into the memory.

MONR1 Monitor Receive Register 1

After reset FFH

(GCI only)

M1 M2 M3 M4 M5 M6 M7 M8

The value read from MONR1 gives the

value of the byte received in the moni-

tor channel according to GCI transfer

protocol. RMR1 interrupt indicates

when a new byte is available in

MONR1 register.

CIX2

Command/Indicate Transmit Register 2

After Reset FFH

(GCI and TE mode only)

1

1 P1 P2 P3 P4 P5 P6

P1/P6 Code transmitted permanently in the

2nd GCI C/I channel.

CIX1

Command/Indicate Transmit Register 1

After reset FFH

(GCI only)

1

1

1

1 C1 C2 C3 C4

C1, C2, C3, C4:

Code to be transmitted permanently

in the outgoing GCI C/I channel.

CIR1

Command/Indicate Receive Register 1

After reset FFH

(GCI only)

1

1

1

1 C1 C2 C3 C4

C1, C2, C3, C4:

Incoming GCI C/I channel.

CIR2

Command/Indicate Receive Register 2

After reset FFH

(GCI and TE mode selected only)

1

1 P1 P2 P3 P4 P5 P6

P1/P6

The contents of the 2nd C/I channel;

they are the different requests received

from TE peripheral devices to µP.

Six peripherals can make a simultane-

ous request.

MONX2

Monitor Transmit Register 2

After reset FFH

(GCI and TE mode only)

The value written in MONX2 is trans-

mitted in the 2nd GCI M channel to a

peripheral (if PI= 1; register CF).

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