GE CM6 Hardware Reference Manual page 46

CHAPTER 5
Chapter Scope
Address Map
Local Bus Controller
GE Intelligent Platforms – CM6 Hardware Reference Manual, Fourth Edition
Resources
This chapter describes system resources, such as memory mapping, register set
and default interrupt request assignments.
The MPC8641 supports a flexible 36-bit physical address map. Conceptually,
the address map consists of local space and external address space.
The local address map spans 64 GByte. The e600 core uses a 52-bit interim
virtual address to address 4 PBytes of virtual memory, and a 36-bit physical
address to address 64 GByte of physical memory. The MPC8641 can be made
part of an even larger system address space through the mapping of translation
windows. This functionality is included in the address translation and mapping
units (ATMUs). Both inbound and outbound translation windows are provided.
The ATMUs allow the MPC8641 to be part of the larger address maps such as
the PCI Express 64-bit address environment.
The local bus controller (LBC) of the MPC8641 in the CM6 is used as a
general-purpose machine which supports compatible SRAM, ROM and
peripherals with 8-, 16-, 32-bit devices. The supplied chip selects of the LBC
are connected to a 32-bit wide boot and application Flash ROM, an 8-bit wide
nvSRAM/RTC device and an 8-bit CPLD with CM6 unique status and control
registers.
After reset the boot code is fetched from the boot/application Flash ROM. The
address map is defined by the boot loader respective depends on the operating
system please refer to the appropriate software manual.
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