S82091AA データシートの表示（PDF） - Intel

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S82091AA

ADVANCED INTEGRATED PERIPHERAL (AIP)

Intel 

82091AA

1 0 OVERVIEW

The major functions of the 82091AA are shown in Figure 1 A brief description of each of these functions is

presented in this section

Host Interface

The 82091AA host interface is an 8-bit direct-drive (24 mA) ISA Bus X-Bus interface that permits the CPU to

access its registers through read write operations in I O space These registers may be accessed by pro-

grammed I O and or DMA bus cycles With the exception of the IDE Interface all functions on the 82091AA

require only 8-bit data accesses The 16-bit access required for the IDE Interface is supported through the

appropriate chip selects and data buffer enables from the 82091AA

Figure 2 shows an example system implementation with the 82091AA located on an ISA Bus add-in card This

add-in card could also be used in a PCI-based system as shown in Figure 3 For motherboard implementa-

tions the 82091AA can be located on the X-Bus as shown in Figure 4

Figure 2 Block Diagram of the 82091AA on the ISA Bus

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