mt90870ag2 Zarlink Semiconductor, mt90870ag2 Datasheet - Page 20

• Manufacturer Part Number: mt90870ag2
• Description: Flexible 12 K Digital Switch F12kdx
• Manufacturer: Zarlink Semiconductor

2.048 Mb/s are included, there will be a corresponding reduction in switch capacity although conversion between
differing rates will be maintained.
2.1.1
The device can provide data switching between the Backplane input port (8192 channels) and the Local output port
(4096 channels). The Local Connection Memory determines the switching configurations.
2.1.2
The device can provide data switching between the Local input port (4096 channels) and the Backplane output port
(8192 channels). The Backplane Connection Memory determines the switching configurations.
2.1.3
The device can provide data switching between the Backplane input (8192 channels) and output (8192 channels)
ports. The Backplane Connection Memory determines the switching configurations.
2.1.4
The device can provide data switching between the Local input (4096 channels) and output (4096 channels) ports.
The Local Connection Memory determines the switching configurations.
2.1.5
The device may be optionally configured to provide a 12,288 x 12,288 uni-directional switch by grouping together
Backplane and Local input and output streams.
2.2
The selection of individual stream data-rates is summarized in Table 1.
2.2.1
The Local port has 16 input (LSTi0-15) and 16 output (LSTo0-15) data streams. All input and output streams may
be individually selected for operation at a data rate of either 2.048 Mb/s, 4.096 Mb/s, 8.192 Mb/s or 16.384 Mb/s.
The timing of the input and output clocks and frame pulses are shown in Figure 6, Local Port Timing Diagram for
2,4,8 and 16 Mb/s stream rates.
2.2.1.1
The bit rate for each input stream is selected by writing to a dedicated Local Input Bit Rate Register (LIBRR0-15).
Refer to Table 41, Local Input Bit Rate Register (LIBRRn) Bits.
Input stream - Backplane 0-15 (BSTi0-15)
Input stream - Backplane 16-31 (BSTi16-31)
Output stream - Backplane 0-15 (BSTo0-15)
Port Data Rate Modes and Selection
Backplane-to-Local Path
Local-to-Backplane Path
Backplane-to-Backplane Path
Local-to-Local Path
Uni-directional Switch
Local Port Rate Selection
Local Input Port
Stream Number
Zarlink Semiconductor Inc.
MT90870
2.048, 4.096, 8.192 or 16.384 Mb/s - Non-32 Mb/s Mode
32.768 Mb/s - 32 Mb/s Mode
2.048, 4.096, 8.192 or 16.384 Mb/s - Non-32 Mb/s Mode
Unused - 32 Mb/s Mode
2.048, 4.096, 8.192 or 16.384 Mb/s - Non-32 Mb/s Mode
32.768 Mb/s - 32 Mb/s Mode
20
(for each individual stream)
Rate Selection Capability
Data Sheet