MT90820 Mitel Networks Corporation, MT90820 Datasheet - Page 4

• Manufacturer Part Number: MT90820
• Description: CMOS ST-BUS FAMILY Large Digital Switch (LDX)
• Manufacturer: Mitel Networks Corporation

MT90820
2-182
Pin Description
55 -
65 -
77 -
84
52
53
62
72
73
74
76
84
-
Pin #
32-39
42-49
58-65
1 - 4,
100
27 -
51 -
77 -
30,
25
26
50
55
57
54
80
STo0 - 7
AS/ALE
AD0 - 7
D8 - 15
CMOS
Name
CSTo
ODE
DTA
NC
IM
Address Strobe or Latch Enable: This input is only used if multiplexed bus is
selected.
CPU Interface Mode (input): If High, this input selects the multiplexed
microprocessor bus interface. If this input is not connected or grounded, the
device resumes non-multiplexed bus interface.
Address/Data Bus (Bidirectional): These are bi-directional data pins on the
microprocessor interface. In the multiplexed bus mode, these pins also provide
the input address to the internal registers and memories.
Data Bus (Bidirectional): These are additional bi-directional data pins on the
microprocessor interface.
Data Acknowledgement (Open Drain Output): This active low output indicates
that a data bus transfer is complete. A 10 kohm pull-up resistor is required at this
output.
Control Output (output).
Output Device Enable (input): This is the output enable control for the STo0 to
STo15 serial outputs. When this input is high, the STo0-15 output drivers function
normally. If this input is low, Sto0-15 are in high impedance. Note: Even when
ODE is high, each channel may still be put into high impedance state by using per
channel control bit in the connection memory.
Data Stream Output 0 to 7: Serial data Output stream. These streams may have
data rates of 2.048, 4.096 or 8.192Mb/s.
Unused pins.
Description
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