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A8259 Datasheet(PDF) 5 Page - Altera Corporation |
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A8259 Datasheet(HTML) 5 Page - Altera Corporation |
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5 / 24 page  Altera Corporation 61 a8259 Programmable Interrupt Controller Data Sheet Figure 3. a8259 Initialization Sequence Flow Diagram Figures 4 and 5 show typical write and read cycles, respectively. The ncs, nwr , and nrd signals enable data to be written to and read from the a8259 . This data is clocked by the rising edge of clk. The ncs and nwr signals must be held low for an entire clock cycle in order to read or write valid data. Figure 4. Typical Write Cycle X indicates “don’t care.” DV indicates “data valid.” ICW 1 ICW 2 ICW 3 ICW 4 Ready to accept interrupts Is SINGLE low? Note (1) Is IC4 high? Note (1) Yes Yes No No Note: (1) For more information on SINGLE and IC4, see Table 3 on page 62. X X DV clk nwr ncs din[7..0] |
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