參數(shù)資料
型號: MC145574
廠商: Motorola, Inc.
英文描述: ISDN S/T-Interface Transceiver
中文描述: 綜合業(yè)務(wù)數(shù)字網(wǎng)S / T的接口收發(fā)器
文件頁數(shù): 47/164頁
文件大?。?/td> 1072K
代理商: MC145574
MC145574
6–1
MOTOROLA
The MC145574 is able to work with a General Circuit Interface port (GCI). The GCI is a standard
four–wire interface between devices for the subscriber access in ISDN and analog environments. The
principle use in these applications is to control the subscriber line interface circuitry.
The following are some of the benefits of the General Circuit Interface.
Operation and Maintenance Features
Activation and Deactivation Facilities (via a Control Indication (C/I) Channel)
Well–Defined Transmission Protocols to Ensure Correct Information Transfer Between GCI Com-
patible Devices
Point–to–Point and Multipoint Communication Links
Multiplexed Mode of Operation Where up to Eight GCI Channels can be Combined to Form a
Single Data Stream
The GCI interface consists of a transmit path, a receive path, an associated clock, and a frame sync
signal. These signals are known as Dout, Din, DCL, and FSC.
The clock determines the rate of exchange of data in both the transmit and receive directions. The
frame sync signal indicates when this exchange will start.
In a GCI channel, information is in a 4–byte time–division based structure with a repetition rate of
8 kHz. The four bytes are B1 and B2 channels, a monitor (M) channel, and a C/I channel.
The two independent B channels are used to carry subscriber voice and data information. The M chan-
nel is used for operation and maintenance facilities. The C/I channel is further subdivided into two
bits for the D channel information, four bits for the control/indication (C/I) channel, and two bits for
the A and E channels that are used to control the transfer of information on the Monitor channel.
Figure 6–1 shows the relative positions of these channels.
GCI modes can be enabled via two different methods, depending on the application requirements.
1.
The GCI mode can be enabled through the GCI control register present in the SCP. This is called
indirect mode. See descriptions for OR6(2) and OR5.
2.
Alternatively, if the SCP port is not required or available, then the GCI mode can be enabled at
hardware reset. This is called direct mode. This is done by connecting SCPEN/GCIEN to VSS
during reset.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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