MT90871 Zarlink Semiconductor, MT90871 Datasheet - Page 10

• Manufacturer Part Number: MT90871
• Description: Flexible 8K Digital Switch (F8KDX)
• Manufacturer: Zarlink Semiconductor

2.1.4
The device can provide data switching between the Local input and output ports. The Local Connection
Memory determines the switching configurations.
2.1.5
The device may be optionally configured to provide an 8,192 x 8,192 uni-directional switch by grouping
together all input and all output streams. All streams (LSTi/LSTo0-15 and BSTi/BSTo0-15) may be operated at
a data-rate of 16.384Mb/s. Lower data-rates may be employed with a corresponding reduction in switch
capacity.
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 2.048Mb/s, 4.096Mb/s, 8.192Mb/s or
16.384Mb/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 16Mb/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 38, Local Input Bit Rate Register (LIBRRn) Bits.
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Input stream - Local 0-15 (LSTi0-15)
Output stream - Local 0-15 (LSTo0-15)
Input stream - Backplane 0-15 (BSTi0-15)
Output stream - Backplane 0-15 (BSTo0-15)
Uni-directional Switch
Port Data Rate Modes and Selection
Local Port Rate Selection
Local Input Port
Local-to-Local path
Table 1- Per-stream Data-Rate Selection: Backplane and Local streams
Stream Number
Zarlink Semiconductor Inc.
2.048, 4.096, 8.192 or 16.384Mb/s
2.048, 4.096, 8.192 or 16.384Mb/s
2.048, 4.096, 8.192 or 16.384Mb/s
2.048, 4.096, 8.192 or 16.384Mb/s
(for each individual stream)
Rate Selection Capability
Data Sheet