MT9080
CMOS
Pin Description
Pin #
46-61
Name
A0-A15
Description
Address Bus.
These inputs have three different functions. Inputs A0-A10 are used to
address internal memory locations during read or write operations in all modes except Shift
Register mode. In Shift Register mode, the levels latched in on A0-A10 program the delay
through the device. When the ME pin is tied high, the data latched in on A0-A15 is clocked
out on to the data bus (D0o-D15o).
Change Detect.
Open drain output which is pulled low when a change in the memory
contents from one frame to the next is detected by a Cyclic Redundancy Check (CRC).
Changes in memory contents resulting from microprocessor access do not cause CD to go
low. The output is reset to its normal high impedance state when the DS input is strobed,
while the device has been selected (CS is low).
Supply Voltage. +5V .
Ground.
62
CD
63
64
65-68
V
DD
V
SS
D0o-D3o Output Data Bus.
These three state outputs are part of a 16 bit data bus which is used to
clock out data from the device. Data is clocked out with the rising edge of the clock. See
Figures 24 to 26 for timing information. The bus is actively driven when ODE is tied high. It
is disabled when ODE is tied low. Tying CS high will also disable the output data bus in all
modes except Connect Memory and Shift Register Modes.
V
SS
Ground.
69
70-73
74
75-78
79
80-83
84
D4o-D7o Output Data Bus.
See description for pins 65-68.
V
SS
Ground.
D8o-D11o Output Data Bus.
See description for pins 65-68.
V
SS
Ground.
D12o-D15 Output Data Bus.
See description for pins 65-68.
o
V
DD
Supply Voltage. +5V .
2-104
MITEL [ MITEL NETWORKS CORPORATION ]
