User`s manual

4.1 PCI Interrupts and Arbitration

Figure 4–2 Interrupt and Interrupt Mask Registers

RAZRAZRAZRAZRAZRAZRAZ intd3

76543210

LJ-04211.AI

Notes:

Interrupt and Interrupt Mask Register 3 (ISA Address 806h)

Interrupt and Interrupt Mask Register 2 (ISA Address 805h)

Interrupt and Interrupt Mask Register 1 (ISA Address 804h)

RAZ = Read-as-Zero, Read-Only

Interrupt Mask Register Is Write-Only

intb3intc0intc1intc2intc3intd0intd1intd2

76543210

inta0inta1inta2inta3intb0intb1intb2 sio

76543210

4.1.2 Arbitration

Arbitration logic is implemented in the Intel 82378ZB Saturn I/O (SIO)

chip. The arbitration scheme is ﬂexible and software programmable. Refer

to the Intel 82420/82430 PCIset ISA and EISA Bridges document for more

information about programmable arbitration.

4.2 ISA Bus Devices

Two dedicated ISA expansion slots are provided in addition to the combination

ISA/PCI slot. System support features such as serial lines, parallel port,

integrated device electronics (IDE), and diskette controller are embedded on

the module by means of an 87312 combination controller chip. Also shown is

the utility bus (Ubus) with its system support devices.

4.3 dc Power Distribution

The EB164 derives its system power from a user-supplied PC power supply.

The power supply must provide +12 V dc and –12 V dc, –5 V dc, +3 V dc,

and Vdd (+5 V dc). The dc power is supplied through power connectors J18

and J29. (See Figure 4–3.) Power is distributed to the board logic through

dedicated power planes within the 6-layer board structure.

Functional Description 4–5