AcQuisition Technology Quad M-module Carrier i4000 Manuel du matériel - Page 14

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i4000 - Quad M-module Carrier for VMEbus

Software issues

5.1. Address mapping

As mentioned before the address space occupied by the i4000 board is $800 bytes

(A0-A10). These $800 bytes are divided into 4 identical spaces. Every $200 bytes block

is assigned to a module slot. The first $100 byte address space is assigned to the

module itself and the second $100 byte is used for the access part of the interrupt

controller.

Using this method of address decoding provides an identical address map for each

module on the i4000 board. This makes writing the software easier since just the base

address of the module, not the base address of the i4000 has to be known. Every

module has its own Interrupt-Vector and Interrupt-Control register. The $100 bytes from

each module used to access the interrupt controller are not completely decoded. Both

registers of the Interrupt controller are mirrored several times within the $100 bytes

address space. If the module itself the $100 bytes completely decodes, depends on the

used module.

The base address of a module can be calculated using the following formula:

ModuleBaseAddress = i4000BaseAddress + ModuleNumber * $200

EXAMPLE:

The installed base address of the i4000 is $800000. A module is fitted into slot 2. The

module base address is then $800000 + 2 * $200 = $800200. When using a 32 bit

master which accesses the standard address space at address $ffxxxxxx, then the

AcQuisition Technology B.V.

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Address Map of the i4000:

$000..$0ff

Module

$101

Control register (CR0)

$103

Vector register (VR0)

$200..$2ff

Module

$301

Control register (CR1)

$303

Vector register (VR1)

$400..$4ff

Module

$501

Control register (CR2)

$503

Vector register (VR2)

$600..$6ff

Module

$701

Control register (CR3)

$703

Vector register (VR3)

page 13

Module 0

Module 1

Module 2

Module 3

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