MT9160B/61B
Motorola/National operation. Refer to the relative
timing diagrams of Figures 5 and 6.
Receive data is sampled on the rising edge of SCLK
while transmit data is made available concurrent with
the falling edge of SCLK.
Advance Information
Flexible Digital Interface
A serial link is required to transport data between the
MT9160B/61B and an external digital transmission
device. The MT9160B/61B utilizes the ST-BUS
architecture defined by Mitel Semiconductor but also
COMMAND/ADDRESS
DATA INPUT/OUTPUT
COMMAND/ADDRESS:
DATA 1
RECEIVE
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
DATA 1
TRANSMIT
SCLK
y
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
CS
Delays due to internal processor timing which are transparent.
y
The MT9160:-latches received data on the rising edge of SCLK.
-outputs transmit data on the falling edge of SCLK.
The falling edge of CS indicates that a COMMAND/ADDRESS byte will be transmitted from the microprocessor. The
subsequent byte is always data until terminated via CS returning high.
A new COMMAND/ADDRESS byte may be loaded only by CS cycling high then low again.
D
7
The COMMAND/ADDRESS byte contains: 1 bit - Read/Write
3 bits - Addressing Data
X
X
X
X
A
2
A
1
4 bits - Unused
D
0
A
0
R/W
Figure 4 - Serial Port Relative Timing for Intel Mode 0
COMMAND/ADDRESS
DATA INPUT/OUTPUT
COMMAND/ADDRESS:
DATA 2
RECEIVE
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
DATA 1
TRANSMIT
SCLK
y
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
CS
Delays due to internal processor timing which are transparent.
y
The MT9160:-latches received data on the rising edge of SCLK.
-outputs transmit data on the falling edge of SCLK.
The falling edge of CS indicates that a COMMAND/ADDRESS byte will be transmitted from the microprocessor. The
subsequent byte is always data until terminated via CS returning high.
A new COMMAND/ADDRESS byte may be loaded only by CS cycling high then low again.
D
7
The COMMAND/ADDRESS byte contains: 1 bit - Read/Write
3 bits - Addressing Data
A
2
4 bits - Unused
R/W
X
A
1
X
X
D
0
A
0
X
Figure 5 - Serial Port Relative Timing for Motorola Mode 00/National Microwire
84
MITEL [ MITEL NETWORKS CORPORATION ]
