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a8259

Features: ·Optimized for FLEX® and MAX® architectures·Offers eight levels of individually maskable interrupts·Expandable to 64 interrupts·Offers a flexible priority resolution scheme·Provides programmable interrupt modes and vectors·Uses approximately 399 logic elements (LEs) in FLEX devic...

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a8259: Features: ·Optimized for FLEX® and MAX® architectures·Offers eight levels of individually maskable interrupts·Expandable to 64 interrupts·Offers a flexible priority resolution scheme·Provide...

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a8259
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Description



Features:

·Optimized for FLEX® and MAX® architectures
·Offers eight levels of individually maskable interrupts
·Expandable to 64 interrupts
·Offers a flexible priority resolution scheme
·Provides programmable interrupt modes and vectors
·Uses approximately 399 logic elements (LEs) in FLEX devices
·Functionally based on the Intel 8259 device, excep


Description

The Altera® a8259 MegaCore™ function is a programmable interrupt controller. The a8259 can be initialized by the microprocessor through eight data bus lines (din[7..0] and dout[7..0]), and the ncs, nrd, nwr,int, and ninta control signals. Figure 1 shows the symbol for the a8259.




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