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Extra info for EISA System Architecture (PC System Architecture)
Level-triggered operation facilitates the sharing of a single system interrupt request line by a number of I/O devices. Level-triggered interrupts might be used, for example, to share a single interrupt request line between a number of serial ports. Automatic System Configuration EISA systems implement the capability to perform automatic configuration of system resources and EISA expansion boards each time the system is powered 12 Chapter 1: EISA Overview up. System resources such as serial ports, parallel ports, VGA and other manufacturer-specific functions can be fully configured programmatically.
Example Arbitration Between Two Bus Masters The timing diagram in the figure 3-4 illustrates bus arbitration between two Bus masters. BCLK 8 6 2 MREQ1# 3 5 11 MAK1# 9 4 MREQ2# 7 10 MAK2# BUS MASTER Host CPU Bus Master 1 Bus Master 2 Bus Master 1 1 Figure 3-4. Arbitration between Two Bus Masters 29 EISA System Architecture The following steps define the sequence of events illustrated in figure 3-4. The step numbers correspond to the reference numbers in the illustration. 1. 2. Initially, the main processor owns the bus.
For switch-configurable boards, the configuration files can be used to determine the proper assignment of resources and to instruct the user about the proper selection of switch settings. To accomplish the automatic configuration of the system board and expansion cards, EISA uses slot-specific I/O port ranges. An EISA card using these ranges can be installed into any slot in the system without the risk of I/O range conflicts. These I/O ranges can be used for expansion card initialization or for normal I/O port assignments that are guaranteed not to conflict with any other expansion board installed in the system.