MT90823
CMOS
Pin Description (continued)
Pin #
84
100
PLCC MQFP
51
24
100
LQFP
21
120
BGA
N12
Name
Description
CS
Chip Select (5V Tolerant Input):
Active low input used
by a microprocessor to activate the microprocessor
port of MT90823.
Address Strobe or Latch Enable (5V Tolerant Input):
This input is used if multiplexed bus operation is
selected via the IM input pin. For Motorola
non-multiplexed bus operation, connect this pin to
ground.
CPU Interface Mode (5V Tolerant Input):
When IM is
high, the microprocessor port is in the multiplexed
mode. When IM is low, the microprocessor port is in
non-multiplexed mode.
Address/Data Bus 0 to 7 (5V Tolerant I/O):
These
pins are the eight least significant data bits of the
microprocessor port. In multiplexed mode, these pins
are also the input address bits of the microprocessor
port.
Data Bus 8-15 (5V Tolerant I/O):
These pins are the
eight most significant data bits of the microprocessor
port.
Data Transfer Acknowledgement (5V tolerant
Three-state Output):
Indicates that a data bus transfer
is complete. When the bus cycle ends, this pin drives
HIGH and then tri-states, allowing for faster bus cycles
with a weaker pull-up resistor. A pull-up resistor is
required to hold a HIGH level when the pin is tri-stated.
Control Output (5V Tolerant Output).
This is a 4.096,
8.192 or 16.384 Mb/s output containing 512, 1024 or
2048 bits per frame respectively. The level of each bit is
determined by the CSTo bit in the connection memory.
See External Drive Control Section.
Output Drive Enable (5V Tolerant Input):
This is the
output enable control for the STo0-15 serial outputs.
When ODE input is low and the OSB bit of the IMS
register is low, STo0-15 are in a high impedance state.
If this input is high, the STo0-15 output drivers are
enabled. However, each channel may still be put into a
high impedance state by using the per channel control
bit in the connection memory.
Data Stream Output 0 to 7 (5V Tolerant Three-state
Outputs):
Serial data Output stream. These streams
have selectable data rates of 2.048, 4.096 or 8.192 Mb/
s.
52
25
22
M11
AS/ALE
53
26
23
N13
IM
55 -
62
32-39
29 -
36
L12,L13,K12,
K13,J12,J13,
H12,H13
AD0 - 7
65 -
72
73
42-49
39 -
46
47
G12,G13,F12,
F13,E12,E13,
D12,D13
C12
D8 - 15
50
DTA
74
55
48
C13
CSTo
76
57
54
B11
ODE
77 -
84
58-65
55 -
62
A11,B10,A10,B9,
A9,A8,B8,A7
STo0 - 7
6
MITEL [ MITEL NETWORKS CORPORATION ]
