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MT90820AL Datasheet(PDF) 8 Page - Zarlink Semiconductor Inc |
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MT90820AL Datasheet(HTML) 8 Page - Zarlink Semiconductor Inc |
8 / 37 page MT90820 Data Sheet 8 Zarlink Semiconductor Inc. Wide Frame Pulse (WFP) Frame Alignment Timing When the device is in WFP frame alignment mode, the CLK input must be at 16.384 MHz, the FE/HCLK input is 4.096 MHz and the 8 kHz frame pulse is in ST-BUS format. The timing relationship between CLK, HCLK and the frame pulse is defined in Figure 12. When WFPS pin is high, the frame alignment evaluation feature is disabled, but the frame input offset registers may still be programmed to compensate for the varying frame delays on the serial input streams. Switching Configurations The MT90820 maximum non-blocking switching configurations is determined by the data rates selected for the serial inputs and outputs. The switching configuration is selected by two DR bits in the IMS register. See Table 8 and Table 9. 2.048 Mb/s Serial Links (DR0=0, DR1=0) When the 2.048 Mb/s data rate is selected, the device is configured with 16-input/16-output data streams each having 32 64 Kbit/s channels each. This mode requires a CLK of 4.094 MHz and allows a maximum non-blocking capacity of 512 x 512 channels. 4.096 Mb/s Serial Links (DR0=1, DR1=0) When the 4.096 Mb/s data rate is selected, the device is configured with 16-input/16-output data streams each having 64 64 Kbit/s channels each. This mode requires a CLK of 8.192 MHz and allows a maximum non-blocking capacity of 1,024 x 1,024 channels. 8.192 Mb/s Serial Links (DR0=0, DR1=1) When the 8.192 Mb/s data rate is selected, the device is configured with 16-input/16-output data streams each having 128 64 Kbit/s channels each. This mode requires a CLK of 16.384 MHz and allows a maximum non- blocking capacity of 2,048 x 2,048 channels. Table 1 summarizes the switching configurations and the relationship between different serial data rates and the master clock frequencies. Table 1 - Switching Configuration Serial Interface Data Rate Master Clock Required (MHz) Matrix Channel Capacity 2 Mb/s 4.096 512 x 512 4 Mb/s 8.192 1,024 x 1,024 8 Mb/s 16.384 2,048 x 2,048 |
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