Advance Information
Pin Description (continued)
Pin #
44
48
PLCC SSOP
19-21
22
23
24
25-27
29-33
34
35-39
41-43
44
20-22
23
24
26
27-29
31-35
1,
25,37
38-42
44-46
47
Name
Description
MT89L80
A3-5
DS
R/W
CS
D7-D5
D4-D0
V
SS
Address 3-5 / Input Streams 11-13
(5V-tolerant Input). These are the inputs for the
address lines on the microprocessor interface.
Data Strobe
(5V-tolerant Input). This is the input for the active high data strobe on the
microprocessor interface.
Read/Write
(5V-tolerant Input). This is the input for the read/write signal on the
microprocessor interface - high for read, low for write.
Chip Select
(5V-tolerant Input). This is the input for the active low chip select on the
microprocessor interface
Data Bus
(5V-tolerant I/O): These are the bidirectional data pins on the microprocessor
interface.
Data Bus
(5V-tolerant I/O): These are the bidirectional data pins on the microprocessor
interface.
Ground.
STo7-3 ST-BUS Outputs 7 to 3
(5V-Tolerant Three-state Outputs). These are the pins for the
eight 2048 kbit/s ST-BUS output streams.
STo2-0 ST-BUS Outputs 2to 0
(5V-Tolerant Three-state Outputs). These are the pins for the
eight 2048kbit/s ST-BUS output streams.
ODE
Output Drive Enable
(5V-tolerant Input). If this input is held high, the STo0-STo7 output
drivers function normally. If this input is low, the STo0-STo7 output drivers go into their
high impedance state.
NB:
Even when ODE is high, channels on the STo0-STo7
outputs can go high impedance under software control.
Control ST-BUS Output
(5V-Tolerant Output). Each frame of 256 bits on this ST-BUS
output contains the values of bit 1 in the 256 locations of the Connection Memory High.
No Connection.
1
48
CSTo
NC
6, 18, 6, 19,
28, 40 30, 43
2-5
MITEL [ MITEL NETWORKS CORPORATION ]
