Advance Information
MT91L60/61
When 0, D-Channel data is shifted at the rate of 2
bits/frame (16 kb/s default).
frame. By arbitrarily assigning ST-BUS frame n as
the
reference
frame,
during
which
the
microprocessor D-Channel read and write operations
are performed, then:
16 kb/s D-Channel operation is the default mode
which allows the microprocessor access to a full byte
of D-Channel information every fourth ST-BUS
➃
➄
COMMAND/ADDRESS
DATA INPUT/OUTPUT
COMMAND/ADDRESS:
➀
➀
DATA 1
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
RECEIVE
D
D
D
D
D
D
D
DATA 1
TRANSMIT
0
1
2
3
4
5
6
7
0
1
2
3
4
5 6
7
②
SCLK
CS
➃
➂
➂
➀
②
Delays due to internal processor timing which are transparent.
The MT91L60/L61:latches received data on the rising edge of SCLK.
-outputs transmit data on the falling edge of SCLK.
➂
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.
➃
➄
A new COMMAND/ADDRESS byte may be loaded only by CS cycling high then low again.
D
D
0
7
The COMMAND/ADDRESS byte contains: 1 bit - Read/Write
3 bits - Addressing Data
4 bits - Unused
X
X
X
X
A
A
A
0
R/W
2
1
Figure 4 - Serial Port Relative Timing for Intel Mode 0
➃
COMMAND/ADDRESS:
COMMAND/ADDRESS
DATA INPUT/OUTPUT
➄
➀
➀
DATA 2
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
RECEIVE
D
D
D
D
D
D
D
DATA 1
TRANSMIT
7
6
5
4
3
2
1
0
7
6
5
4
3
2 1
0
②
SCLK
CS
➃
➂
➂
➀
②
Delays due to internal processor timing which are transparent .
The MT91L60/L61: latches received data on the rising edge of SCLK.
-outputs transmit data on the falling edge of SCLK.
➂
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.
➃
➄
A new COMMAND/ADDRESS byte may be loaded only by CS cycling high then low again.
D
D
The COMMAND/ADDRESS byte contains: 1 bit - Read/Write
3 bits - Addressing Data
4 bits - Unused
7
0
A
R/W
X
X
X
A
A
X
2
1
0
Figure 5 - Serial Port Relative Timing for Motorola Mode 00/National Microwire
7
MITEL [ MITEL NETWORKS CORPORATION ]
