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ST5451D 数据表(PDF) 9 Page - STMicroelectronics

部件名 ST5451D
功能描述  ISDN HDLC AND GCI CONTROLLER
Download  34 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST5451D 数据表(HTML) 9 Page - STMicroelectronics

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CAC
Channel Activation
CAC = 1 : Activate RX and TX
CAC = 0 : deactivate RX and TX
NHF
HDLC Function Select
NHF = 1 : disable HDLC function
FLA
Flag
FLA = 1 : transmit shared flags
FLA = 0 : transmit two flags between
consecutive frames.
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.
CIX1
Command/Indicate Transmit Register 1
After reset FFH
(GCI only)
1
1
1
1
C1C2
C3C4
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
C1C2
C3C4
C1, C2, C3, C4:
Incoming GCI C/I channel.
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.
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.
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).
ST5451
9/34


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