MT8980DP1 Zarlink Semiconductor, Inc., MT8980DP1 Datasheet - Page 8

• Manufacturer Part Number: MT8980DP1
• Description: 256 x 256 Channels (8 TDM Streams at 2.048 Mbps) Non-blocking Digital Switch (DX)
• Manufacturer: Zarlink Semiconductor, Inc.

MT8980D
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
sufficient hold time for the FP signal, but the values
used may have to be changed if faster 393 counters
become available.
2-10
Controlling
Processor
Micro-
with the
Figure 9 - Four 8980s Arranged in a Non-Blocking 16 x 16 Configuration
Figure 8 - Example Architecture of a Simple Digital Switching System
IN 8/15
IN 0/7
393 counters
Signalling
Control &
Speech
Switch
8980
8980
-
-
ensures a
STo0-7
8
STi0-7
STi0/7 STo0/7
STi0/7 STo0/7
STi0/7 STo0/7
STi0/7 STo0/7
8
STo0-7
8980
8980
8980
8980
#2
#3
#4
#1
8
STi0-7
8
The chip is shown as memory mapped into the
MEK6802D3
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.
with Codec (e.g. 8964)
with Codec (e.g.8964)
Line Interface Circuit
Line Interface Circuit
Repeated for Lines
2 to 255
system.
•
•
•
Chip
Line 256
OUT 0/7
OUT 8/15
Line 1
addresses
Repeated for Lines
2 to 255
•
•
•
00-3F