參數(shù)資料
型號(hào)： MT9173AE1
廠商： ZARLINK SEMICONDUCTOR INC
元件分類(lèi)： 數(shù)字傳輸電路
英文描述： Digital Subscriber Interface Circuit with RxSB Digital Network Interface Circuit with RxSB
中文描述： DATACOM, DIGITAL SLIC, PDIP24
封裝： 0.300 INCH, LEAD FREE, PLASTIC, MS-001, DIP-24
文件頁(yè)數(shù)： 11/28頁(yè)
文件大?。?/td> 613K
代理商： MT9173AE1
MT9173/74
Data Sheet
11
Zarlink Semiconductor Inc.
In order for more than one DNIC to be connected to any one DV and CD port, making more efficient use of the
busses, the DSTo and CDSTo outputs are put into high impedance during the inactive channel times of the DNIC.
This allows additional DNICs to be cascaded onto the same DV and CD ports. When used in this way a signal
called F0o is used as an indication to the next DNIC in a daisy chain that its channel time is now active. Only the
first DNIC in the chain receives the system frame pulse and all others receive the F0o from its predecessor
in the chain. This allows up to 16 DNICs to be cascaded.
CD Port (CDSTi/CDi, CDSTo/CDo)
The CD port is a serial bidirectional port used only in DUAL port mode. It is a means by which the DNIC receives its
control information for things such as setting the bit rate, enabling internal loopback tests, sending status
information back to the system and transferring low speed signalling data to and from the line.
The CD port is composed of the C and D-Channels. The C-channel is used for transferring control and status
information between the DNIC and the system. The D-channel is used for sending and receiving signalling
information and lower speed data between the line and the system. In DN/DUAL mode the DNIC receives a C-
channel on CDSTi while transmitting a C-channel on
CDSTo.
F
ifteen channel times later (halfway through the
frame) a D-channel is received on CDSTi while a D-channel is transmitted on CDSTo. This is shown in Figure 7.
The order of the C and D bytes in DUAL port mode can be reversed by the mode select pins. See Table 1 for a
listing of the byte orientations.
The D-channel exists only in DN mode and may be used for transferring low speed data or signalling information
over the line at 8, 16 or 64 kbit/s (by using the DINB feature). The information passes transparently through the
DNIC and is transmitted to or received from the line at the bit rate selected in the Control Register.
If the bit rate is 80 kbit/s, only D0 is transmitted and received. At 160 kbit/s, D0 and D1 are transmitted and
received. When the DINB bit is set in the Control Register the entire D-channel is transmitted and received in the
B1-channel timeslot.
The C-channel is used for transferring control and status information between the DNIC and the system. The
Control and Diagnostics Registers are accessed through the C-channel. They contain information to control the
DNIC and carry out the diagnostics as well as the HK bit to be transmitted on the line as described in Tables 4 and
5. Bits 0 and 1 of the C-channel select between the Control and Diagnostics Register. If these bits are 0, 0 then the
C-channel information is written to the Control Register (Table 4). If they are 0, 1 the C-
c
hannel is written to the
Diagnostics Register (Table 5).
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