參數(shù)資料
型號： STLC5412
廠商： 意法半導體
英文描述： 2B1Q U INTERFACE DEVICE ENHANCED WITH DECT MODE
中文描述： 2B1Q U接口裝置加強與無繩模式
文件頁數(shù)： 23/74頁
文件大小： 655K
代理商： STLC5412
on Br is in the high impedance state.
A 24 ms timer is implemented in the UID. This
timer (when enabled) starts each time the sender
starts a byte sending and waits for a pre acknow-
ledgement.
C/I channel
The C/I channel is used for TXACT and RXACT
registers write and read operation. However, it is
possible to access to ACT registers by monitor
channel: this access is controled by the CID bit in
CR2 register.
The four bits code (C1,C2,C3,C4) of TXACT reg-
ister can be loaded in the UID by writing perma-
nently this code in the C/I channel time-slot on Bx
input every GCI frames. The UID takes into ac-
count the received code when it has been re-
ceived two consecutive times identical. When a
status change occurs in the RXACT register, the
new (C1,C2,C3,C4) code is sent in the C/I chan-
nel time-slot on Br output every GCI frames. This
code is sent permanently by the UID until a new
status changeoccurs in RXACT register.
C1 bit is sent first to the line.
LINE CODING AND FRAME FORMAT
2B1Q coding rule requires that binary data bits
are grouped in pairs so called quats (see Tab.2).
Each quat is transmitted as a symbol, the magni-
tude of which may be 1 out 4 equally spaced volt-
age levels (see Fig. 6). +3 quat refers to the
nominal pulse waveform specified in the ANSI
standard. Other quats are deduced directly with
respect of the ratio and keeping of the waveform.
The frame format used in UID follows ANSI speci-
fication (see Tab. 3 and 4). Each complete frame
consists of 120 quats, with a line baud rate of 80
kbaud, giving a frame duration of 1.5ms. A nine
quats lenght sync-word defines the framing
boundary.Furthermore, a Multiframeconsistingof
8 frames is defined in order to provide sub-chan-
nels within the spare bits M1 to M6. Inversion of
the syncword defines the multiframe boundary.In
LT, the transmit multiframe starting time may be
synchronized by means of a 12 ms period of time
pulse on the SFSx pin selected as an input (bit
SFS in CR2); If SFSx is selected as an output,
SFSx provides a square wave signal with the ris-
ing edge indicatingthe multiframe startingtime.
In NT, the transmitmultiframe starting time is pro-
Figure 5:
GCI Monitorchannelmessaging examples.
TWO BYTES MESSAGE - NORMAL TRANSMISSION
(M1)
X
M1
M1
M2
M2
X
X
X
1st byte
(M1)
pre-ack
ack
(M1)
2nd byte
(M2)
pre-ack
(M2)
ack
(M2)
3rdbyte
(X)
pre-ack
(X)
EOM
Ready for
Ready
fora message
E & A BITS TIMING
TWO BYTES MESSAGEABORTED ON THE SECOND AND RETRANSMITTED
Rx
1st byte
(M1)
pre-ack
(M1)
ack
(M1)
2nd byte
(M2)
pre-ack
(M2)
abort
(M2)
EOM
(or abort ack)
1st byte
(M1)
pre-ack
(M1)
3rd byte
(X)
Ready for
retransmission
Ready for
a message
X
M1
M1
M2
M2
X
X
X
X
M1
M1
M2
TxTx
TxTx
RxRx
TTx
TTx
Rx A
STLC5412
23/74
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