Owner manual

VM162/VM172 Chapter 2 Functional Description
Page 2- 32
© PEP Modular Computers
Juli 23, 1997
2.10.8 IP Memory Size Control
After a board reset the IP Memory Size is set to 8 MB linear address space by default. By setting Bit 3
of the IP Slot Control register (Memory size bit) the linear addressable memory space can be reduced
from 8 MB to 1 MB.
If 1 MB is selected the whole IP memory address space of 8 MB is available further on. The currently
used memory page (1-of-8 1MB pages) is determined by the memory page bits within the Slot Control
register (Bit 2-0).
Note: This feature is implemented for compatibility reasons to further IP Carrier boards with reduced
address space.
2.10.9 IP Interface Address Map
IPa:
IPb:
Note: Whether 1 or 8 MByte memory address space is selected depends on the memory size bit within
the IP slot control register. Depending on the memory size bit, the memory page bits are relevant or not.
Default is 8 MByte, not paged.
Base Address
(HEX)
Size Port Width Device
CE 00 08 00 128 Byte D8-D16 IP Slot a IO Space
CE 00 08 80 128 Byte D8-D16 IP Slot a ID Space
CE 00 09 01 128 Byte D8 IP Slot a Interrupt Control register
CE 00 09 81 128 Byte D8 IP Slot a Control ragister
D0 00 00 00 1 or 8 MB D8-D16 IP Slot a Memory Space
Base Address
(HEX)
Size Port Width Device
CE 00 0A 00 128 Byte D8-D16 IP Slot b IO Space
CE 00 0A 80 128 Byte D8-D16 IP Slot b ID Space
CE 00 0B 01 128 Byte D8 IP Slot b Interrupt Control register
CE 00 0B 81 128 Byte D8 IP Slot b Control ragister
D0 80 00 00 1 or 8 MB D8-D16 IP Slot b Memory Space