CH Tech Quad M-module Carrier i4000 - Manual (Page 20)

i4000 - Quad M-module carrier for VMEbus
User Manual
Version: 1.2
AcQuisition Technology bv
P.O. Box 627, 5340 AP
Page 20 of 25 Oss, The Netherlands
5.1.2. A DDRESS M APPING
As mentioned before the address space occupied by the i4000 board is 0x800 bytes (A0-A10). These 0x800
bytes are divided into 4 identical spaces. Every 0x200 bytes block is assigned to a module slot. The first
0x100 bytes address space are assigned to the module itself and the second 0x100 bytes are used for the
access part of the interrupt controller.
Using this method of address decoding provides an identical address map of 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 0x100 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 0x100 bytes address
space. Decoding of the M-module’s 0x100 bytes of address space is done on the used M-module.
Address map of the i4000
The base address of a module can be calculated using the following formula:
ModuleBaseAddress = i4000BaseAddress + ModuleNumber * 0x200
EXAMPLE:
The installed base address of the i4000 is 0x800000. A module is fitted into slot 2. The module base address
is then 0x800000 + 2 * 0x200 = 0x800400. When using a 32 bit master, which accesses the standard address
space at address 0xff??????, the module will be accessed at address 0xff800400. The corresponding
interrupt control register address is then 0xff800501.
0x000..0x0ff
0x101
0x103 Module
Control register (CR0)
Vector register (VR0
Module 0
0x200..0x2ff
0x301
0x303 Module
Control register (CR1)
Vector register (VR1)
Module 1
0x400..0x4ff
0x501
0x503 Module
Control register (CR2)
Vector register (VR2)
Module 2
0x600..0x6ff
0x701
0x703 Module
Control register (CR3)
Vector register (VR3)
Module 3