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| lan?sc520 microcontroller data sheet 29 advance information figure 1. lan?sc520 microcontroller block diagram read/write buffers address cpu bus interface am5 x 86 a cpu bus interface unit cpu bus interface pci ta r g e t pci master pci bus arbiter cpu bus arbiter clock generation fifos and fifo control gp-dma address data control/status cpu data bus cpu address bus cpu control/status bus gp bus amdebug? technology and jtag request and grant pci bus pci requests and grants gp bus controller rom/flash controller sdram controller cpu request external gp bus gp-dma controller lan?sc520 microcontroller programmable interrupt controller programmable interval timer watchdog timer real-time clock cmos ram general-purpose timers software timer 16550 uart 16550 uart synchronous serial interface programmable i/o controls pc/at compatibility logic decode unit read/write buffers
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