Ip Memory Size Control; Ip Interface Address Map - PEP VM162 User Manual

VM162/VM172

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:
Base Address
(HEX)
CE 00 08 00
CE 00 08 80
CE 00 09 01
CE 00 09 81
D0 00 00 00
IPb:
Base Address
(HEX)
CE 00 0A 00
CE 00 0A 80
CE 00 0B 01
CE 00 0B 81
D0 80 00 00
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.
Page 2- 32
Chapter 2 Functional Description
Size Port Width
128 Byte D8-D16
128 Byte D8-D16
128 Byte D8
128 Byte D8
1 or 8 MB D8-D16
Size Port Width
128 Byte D8-D16
128 Byte D8-D16
128 Byte D8
128 Byte D8
1 or 8 MB D8-D16
© PEP Modular Computers
Device
IP Slot a IO Space
IP Slot a ID Space
IP Slot a Interrupt Control register
IP Slot a Control ragister
IP Slot a Memory Space
Device
IP Slot b IO Space
IP Slot b ID Space
IP Slot b Interrupt Control register
IP Slot b Control ragister
IP Slot b Memory Space
Juli 23, 1997