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MT9173AE Datasheet(PDF) 9 Page - Mitel Networks Corporation |
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MT9173AE Datasheet(HTML) 9 Page - Mitel Networks Corporation |
9 / 22 page Preliminary Information MT9173/74 9-145 select the DNIC to operate as a MASTER or SLAVE, in DUAL or SINGLE port operation, in MODEM or DIGITAL NETWORK mode and the order of the C and D channels on the CD port. Table 2 provides a description of each mode and Table 3 gives a pin configuration according to the mode selected for all pins that have variable functions. These functions vary depending on whether it is in MAS or SLV, and whether DN or MOD mode is used. The overall mode of operation of the DNIC can be programmed to be either a baseband modem (MOD mode) or a digital network transceiver (DN mode). As a baseband modem, transmit/receive data is passed transparently through the device at 80 or 160 kbit/s by the DV port. The CD port transfers the C-channel and D-Channel also at 80 or 160 kbit/s. In DN mode, both the DV and CD ports operate as ST-BUS streams at 2.048 Mbit/s. The DV port transfers data over pins DSTi and DSTo while on the CD port, the CDSTi and CDSTo pins are used. The SINGL port option only exists in DN mode. In MOD mode, DUAL port operation must be used and the D, B1 and B2 channel designations no longer exist. The selection of SLV or MAS will Table 2. Mode Definitions Table 3. Pin Configurations Mode Function SLV SLAVE - The chip timebase is extracted from the received line data and the external 10.24 MHz crystal is phase locked to it to provide clocks for the entire device and are output for the external system to synchronize to. MAS MASTER - The timebase is derived from the externally supplied data clocks and 10.24 MHz clock which must be frequency locked. The transmit data is synchronized to the system timing with the receive data recovered by a clock extracted from the receive data and resynchronized to the system timing. DUAL DUAL PORT - Both the CD and DV ports are active with the CD port transferring the C&D channels and the DV port transferring the B1& B2 channels. SINGL SINGLE PORT - The B1& B2, C and D channels are all transferred through the DV port. The CD port is disabled and CDSTi should be pulled high. MOD MODEM - Baseband operation at 80 or 160 kbits/s. The line data is received and transmitted through the DV port at the baud rate selected. The C-channel is transferred through the CD port also at the baud rate and is synchronized to the CLD output. DN DIGITAL NETWORK - Intended for use in the digital network with the DV and CD ports operating at 2.048 Mbits/s and the line at 80 or 160 kbits/s configured according to the applicable ISDN recommendation. D-C D BEFORE C-CHANNEL - The D-channel is transferred before the C-channel following F0. C-D C BEFORE D-CHANNEL - The C-channel is transferred before the D-channel following F0. ODE OUTPUT DATA ENABLE - When mode 7 is selected, the DV and CD ports are put in high impedance state. This is intended for power-up reset to avoid bus contention and possible damage to the device during the initial random state in a daisy chain configuration of DNICs. In all the other modes of operation DV and CD ports are enabled during the appropriate channel times. Mode # F0/CLD F0o/RCK C4/TCK Name Input/Output Name Input/Output Name Input/Output 0 F0 Input F0o Output C4 Input 1 CLD Output RCK Output TCK Output 2 F0 Input F0o Output C4 Input 3 F0 Input F0o Output C4 Input 4 F0 Output F0o Output C4 Output 5 CLD Output RCK Output TCK Output 6 F0 Output F0o Output C4 Output 7 F0 Input F0o Output C4 Input |
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