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AM79C32AVC bảng dữ liệu(PDF) 54 Page - Advanced Micro Devices

tên linh kiện AM79C32AVC
Giải thích chi tiết về linh kiện  Digital Subscriber Controller??(DSC?? Circuit
PDF  101 Pages
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nhà sản xuất  AMD [Advanced Micro Devices]
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AM79C32AVC bảng dữ liệu(HTML) 54 Page - Advanced Micro Devices

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54
Am79C30A/32A Data Sheet
Intelligent NT
Either Slave mode can be used to implement the Intel-
ligent NT configuration. The diagram below depicts this
configuration using DSC Slave mode with bus reversal
disabled.
The U-transceiver operates as the IOM-2 master de-
vice, programmed to TE mode and outputting at
1536-kHz DCL. The DSC indicates a D-channel re-
quest according to the TIC bus procedure using the
BAC bit on the DU line (BAC=0). The S-transceiver sur-
veys the received D channel and if it is idle, enables the
DSC to send its D-channel frame to the U-transceiver
on DU by driving S/G low on DD. The S-transceiver
also sets its transmitted E-channel bits on the S-Inter-
face to zero (inversion of received D bits) to prevent all
connected TEs from transmitting data into the D-chan-
nel. When the DSC completes its D-channel transmis-
sion, it releases the TIC bus by setting BAC=1. The
S-transceiver then mirrors the incoming D bits into the
E-channel, thus behaving as a normal NT with trans-
parent D-channel handling.
DSC
SBOUT
SBIN
D-channel
E-channel
DD
DU
B1, B2, D, MON0, C/I0,
upstream
downstream
Figure 11.
IOM-2 Intelligent Configuration
DOUT/DD
DIN/DU
U-transceiver
Master
IC1, IC2, MON1, C/I1, S/G(in), TIC(out)
S-transceiver
LT-S
S Interface



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