CS82C59A-12Z

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CS82C59A-12Z, or Intel Corporation\'s 8-bit Programmable Interrupt Controller, is a type of specialized interface used in computer systems. This device offers enhanced interrupt routing capability, and can be used to control multiple external interrupting devices. The device incorporates input logic that is capable of recognizing level-sensitive or edge-sensitive interrupts, and it has the advanced capability to generate an interrupt that is higher priority than all the other interrupts up to the processor.

The CS82C59A-12Z is composed of a non-overlapping interrupt structure with four cascading levels. The controller can be programmed to support one-to-eight interrupt levels, depending on the particular application. The operation of the controller is based on a control array and two logic planes that are organized into an 8-bit predecoded array. There are four registers in the controller which can be addressed directly or through four 8-bit status, TMP, ISR, and ICR registers.

The CS82C59A-12Z controller provides several features, including the following:

• Synchronous Address Interrupts – The controller can generate multiple synchronous address interrupts from one of four different interrupt levels.
• Four Cascading Interrupts – The controller supports up to four cascading interrupts from multiple interrupting sources.
• Support for Variable Requesting Sources – The controller can also accept requests from a variety of sources, including DMA, external devices, and memory mapped data.

The CS82C59A-12Z controller can be used in a variety of applications, such as industrial control, remote data acquisition, embedded process control, and engineering test systems. The device is ideal for use in high-speed, high-performance systems where response time is important. The device can also be used in wireless communication systems.

The working principle of the CS82C59A-12Z controller is based on the use of a control array that is organized into an 8-bit predecoded array. The control array is capable of decoding up to eight address interrupts from four different interrupt levels. The controller includes two logic planes which operate independently before the two logic planes join at the end of the controller\'s operations. The first logic plane is used to validate the address of an interrupt source and assign a level to each interrupt source. The second logic plane is then used to process the interrupt requests, assign a priority to each request, and set up the appropriate control bits for the interrupt handler.

The CS82C59A-12Z controller also includes two 8-bit TMP (temporary) and ISR (interrupt status) registers which are used to store the address of the interrupting source and the interrupt vector or priority of the interrupt. The ICR register is used to program the controller; this register can be programmed with the proper interrupt vector or priority for each interrupt source. All of these registers are accessible through direct memory cycles.

In conclusion, CS82C59A-12Z is a specialized interface used in computers. It is composed of a non-overlapping interrupt structure with four cascading levels and can be used in a variety of different applications. The working principle is based on a control array and two logic planes which are responsible for validating the addresses of an interrupt source and assigning a priority to each request. The device also offers features such as synchronous address interrupts, four cascading interrupts, and support for variable requesting sources.

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