參數(shù)資料
型號: MC68MH360AI25VL
廠商: Freescale Semiconductor
文件頁數(shù): 74/158頁
文件大?。?/td> 0K
描述: IC MPU QUICC 25MHZ 240-FQFP
標準包裝: 24
系列: M683xx
處理器類型: M683xx 32-位
速度: 25MHz
電壓: 3.3V
安裝類型: 表面貼裝
封裝/外殼: 240-BFQFP
供應(yīng)商設(shè)備封裝: 240-FQFP(32x32)
包裝: 托盤
QMC Supplement
1.6 QMC Serial Routing and Example Applications
The QMC protocol provides multiple logical channels from a single SCC. The SCC
channel dedicated to operate the QMC protocol should have all the relevant bits or time
slots routed to it. Individual logical channels are selected by a combination of signals routed
through the TDM and tables within the QMC protocol. Contrasting a non-QMC example
application with QMC implementations highlights benets of the multichannel protocol.
Figure 1-2 shows an Ethernet-to-BRI bridge using an MC68EN360, a non-QMC device.
The conguration shows the Ethernet routed via an NMSI interface to SCC1. The ISDN
BRI is routed via the TSA over an IDL21 interface to SCC2–SCC4 for the 2 B + D (B1, B2,
and D) channels. The rst byte of the frame (B1) is routed to SCC2, the second byte (B2)
to SCC3, and then the next two bits (the D channel) to SCC4. In this example, SMC2 is
used to connect to a PC over RS232. The internal routing is illustrated in Figure 1-3. Note
that three SCCs are required to implement the ISDN BRI. This uses all the MC68EN360’s
serial channels without efcient use of the CPM bandwidth.
Figure 1-2. Ethernet-to-BRI Bridge Using MC68EN360
1The IDL2 interface is a full duplex ISDN interface used to interface to a physical layer device, such as the
Motorola ISDN S/T transceiver MC145474.
TSA
SCC2
SCC3
SCC4
SCC1
SMC2
MC68EN360
Ethernet
UART
IDL2
MC68160
To LAN
To PC
RS232
MC145574
4-Wire
ISDN
Line
SPI
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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