MT8986 Mitel Semiconductor, MT8986 Datasheet - Page 15

• Manufacturer Part Number: MT8986
• Description: CMOS ST-BUS FAMILY Multiple Rate Digital Switch
• Manufacturer: Mitel Semiconductor

BIT
6-5
4-3
2-1
7
0
ODR1-0
SCB1-0
IDR1-0
NAME
CLKM
DMO
Input Data Rate Selection. These two bits select three different data rates for the inputs
Output Data Rate Selection. These bits are only used when Different I/O rates are
Switching Configuration Bits 1-0. These bits should only be used when DMO is set
Device Main Operation. This bit is used by the CPU to define one of the two main
operations of the MT8986 device. If this bit is LOW, the MT8986 is configured for
identical I/O data rates. For this operation, the user should also specify the switching
configuration through the SCB bits.
If this bit is HIGH, the MT8986 device is configured in Different I/O data rate. This allows
combinations of input and output data rates as shown in Table 2. The SCB bits have no
effect in this application and the device is in Non-Blocking switch configuration with a 256
x 256 channel capacity.
of the MT8986. In the case of identical I/O rates (DMO bit = 0), these bits also determine
the serial output data rate.
selected (DMO bit=1). These two bits select three different data rates for the serial
outputs of the MT8986. These bits are ignored if DMO bit = 0.
LOW. The use of these bits to select the switching configuration of the MT8986 device is
described in Table 8.
Clock Mode. This bit is only used when the MT8986 device is set to operate in identical
I/O data rates. When set High, this bit selects the interface clock to be equal to the bit
rate. If Low, this bit selects the interface clock to be twice the bit rate.
For Different I/O data rate applications, this bit is ignored.
Interface Mode Selection Register - Read/Write
DMO
7
IDR1
Figure 4 - IMS Register Description
ODR1
IDR1
6
0
0
1
1
0
0
1
1
IDR0
5
IDR0
ODR0
0
1
0
1
0
1
0
1
ODR1
4
ODR0
3
DESCRIPTION
Input Rate
2.048 Mb/s
4.096 Mb/s
8.192 Mb/s
reserved
Output Rate
2.048 Mb/s
4.096 Mb/s
8.192 Mb/s
reserved
SCB1
2
SCB0
1
CLKM
0
MT8986
2-77