Advance Information
MT90863
Read/Write Address:
00 ,
Reset Value:
0000 .
H
H
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
AB
CT
MBP
MS2
MS1 MS0 STA4 STA3 STA2 STA1 STA0
Bit
Name
Description
15-11
10
Unused
AB
Must be zero for normal operation.
Address Buffer. When 1, enables the address buffer, data write and data read registers for
accessing various memory locations for fast microport access. When 0, disables the address
buffer, data write & data read registers.
9
8
CT
Channel Tri-state. When 1, the last bit of each output channel is tri-stated for -22ns against
the channel boundary. When 0, the last bit of each channel is not tri-stated.
MBP
Memory Block Program. When 1, the connection memory block programming feature is ready
for the programming of bit 11 to 13 for backplane connection memory, bit 12 to 15 for local
connection memory low. When 0, this feature is disabled.
7 - 5
MS2-0
Memory Select Bits. These three bits are used to select connection and data memory
functions as follows:
MS2-0 Memory Selection
000
001
010
011
100
Local Connection Memory Low Read/Write,
Local Connection Memory High Read/Write,
Backplane Connection Memory Read/Write,
Local Data Memory Read,
Backplane Data Memory Read,
4 - 0
STA4-0
Stream Address Bits. The binary value expressed by these bits refers to the input or output
data stream, which corresponds to the subsection of memory made accessible for subsequent
operations. (STA4 = MSB, STA0 = LSB)
Table 6 - Control (CR) Register Bits
Read/Write Address:
01 ,
Reset Value:
0000 .
H
H
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
0
0
0
LMS1 LMS0 BMS2 BMS1 BMS0
Bit
Name
Description
15 - 5
4 - 3
unused
LMS
Reserved
Local Mode Selection Bit. The binary value expressed by these bits refers to the following
backplane interface switching modes:
LMS1-0
00
Local Switching Mode
2Mb/s ST-BUS Mode
01
10
2Mb/s Sub-rate Switching Mode
8Mb/s ST-Bus Mode
2 - 0
BMS2-0
Backplane Mode Selection Bits. The binary value expressed by these bits refers to the follow-
ing backplane interface switching modes:
BMS2-0
000
001
010
011
100
101
110
Backplane Switching Mode
2Mb/s ST-BUS Mode
2Mb/s CT Bus Mode
4Mb/s ST-BUS Mode
4Mb/s CT Bus Mode
8Mb/s ST-BUS Mode
8Mb/s CT Bus Mode
HMVIP Mode
Table 7 - Device Mode Selection (DMS) Register Bits
13
MITEL [ MITEL NETWORKS CORPORATION ]
