zl50031 Zarlink Semiconductor, zl50031 Datasheet - Page 13

• Manufacturer Part Number: zl50031
• Description: Flexible 4 K X 2 K Channel Digital Switch With H.110 Interface And 2 K X 2 K Local Switch
• Manufacturer: Zarlink Semiconductor

4.0
The device has two operation modes at different data rates for the backplane interface and three operation modes
for the local interface. These modes can be programmed via the Device Mode Selection (DMS) register. Mode
selections between the backplane and local interfaces are independent.
4.1
The backplane interface can be programmed to accept data streams of 8 Mbps or 16 Mbps. When H.110 mode is
enabled, BSTio0 to BSTio31 have a data rate of 8.192 Mbps. When ST-BUS mode is enabled, BSTio0 to BSTio15
have a data rate of 16.384 Mbps. Table 1 describes the data rates and mode selections for the backplane interface.
4.2
The local side of the ZL50031 is divided up into 4 groups. Group 0 contains LSTi0-3 and LSTo0-3, Group 1 contains
LSTi4-7 and LSTo4-7, Group 2 contains LSTi8-11 and LSTo8-11, Group 3 contains LSTi12-15 and LSTo12-15.
Each group can be selected to operate in one of three data rates, 2.048 Mbps, 4.094 Mbps and 8.192 Mbps. The
per-group data rate is selected through the Device Mode Selection (DMS) register. Streams belonging to the same
group have the same operation at the same data rate. See Table 2 on page 14 for a description of the data rates
and mode selection for the local ST-BUS interface.
(16 Mbps mode)
8.192 MHz
(CT Frame)
FRAME_A_io,
FRAME_B_io
C8_A_io,
C8_B_io
BSTio 0 - 15
Backplane Interface
Local Interface
Switching Configuration
BMS Bit of the DMS Register
3
Ch 255
2
Figure 3 - ST-BUS Timing for 16 Mbps Backplane Data Streams
0
1
1 0
7
Table 1 - Mode Selection for Backplane Streams
6
5
Channel 0
4
3
2
1 0
Zarlink Semiconductor Inc.
7
6
Channel 1
5
ZL50031
4
3
13
16.384 Mbps
8.192 Mbps
2
1 0
Modes
6
Channel 254
5
4
3
2
Backplane Interface
1 0
BSTio0 - 31
BSTio0 - 15
7
6
Channel 255
5
4
3
2
1 0
Data Sheet
Ch 0
7 6 5