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MT8980DE Datasheet(PDF) 8 Page - Mitel Networks Corporation |
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MT8980DE Datasheet(HTML) 8 Page - Mitel Networks Corporation |
8 / 14 page MT8980D 2-10 Figure 8 - Example Architecture of a Simple Digital Switching System Controlling Micro- Processor Speech Switch - 8980 Control & Signalling - 8980 STo0-7 STi0-7 STo0-7 Line Interface Circuit with Codec (e.g. 8964) Line 1 Line 256 Line Interface Circuit with Codec (e.g.8964) 8 8 8 8 • • • Repeated for Lines 2 to 255 • • • Repeated for Lines 2 to 255 STi0-7 Application Circuit with 6802 Processor Fig. 10 shows an example of a complete circuit which may be used to evaluate the chip. For convenience, a 4 MHz crystal oscillator has been used rather than a 4.096 MHz clock, as both are within the limits of the chip’s specifications. The RC delay used with the 393 counters ensures a sufficient hold time for the FP signal, but the values used may have to be changed if faster 393 counters become available. The chip is shown as memory mapped into the MEK6802D3 system. Chip addresses 00-3F correspond to processor addresses 2000-203F. Delay through the address decoder requires the VMA signal to be used twice to remove glitches. The MEK6802D3 board uses a 10K Ω pullup on the MR pin, which would have to be incorporated into the circuit if the board was replaced by a processor. Figure 9 - Four 8980s Arranged in a Non-Blocking 16 x 16 Configuration IN 0/7 IN 8/15 8980 #1 STi0/7 STo0/7 8980 #2 STi0/7 STo0/7 8980 #3 STi0/7 STo0/7 8980 #4 STi0/7 STo0/7 OUT 0/7 OUT 8/15 |
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