Freescale Semiconductor MCF5480 - Manual (Page 11)

MCF548x Reference Manual, Rev. 3
Freescale Semiconductor xi
Contents
Paragraph
Number
Title
Page
Number
5.2.3.9 Changes to ACRs and CACR ................................................................................. 5-5
5.2.3.10 ACR Address Improvements .................................................................................. 5-6
5.2.3.11 Supervisor Protection .............................................................................................. 5-7
5.3 Debugging in a Virtual Environment .............................................................................. 5-7
5.4 Virtual Memory Architecture Processor Support ........................................................... 5-7
5.4.1 Precise Faults .............................................................................................................. 5-7
5.4.2 Supervisor/User Stack Pointers ................................................................................. 5-7
5.4.3 Access Error Stack Frame Additions .......................................................................... 5-8
5.5 MMU Definition ............................................................................................................. 5-9
5.5.1 Effective Address Attribute Determination ................................................................ 5-9
5.5.2 MMU Functionality .................................................................................................. 5-10
5.5.3 MMU Organization ................................................................................................... 5-10
5.5.3.1 MMU Base Address Register (MMUBAR) ......................................................... 5-10
5.5.3.2 MMU Memory Map ............................................................................................. 5-11
5.5.3.3 MMU Control Register (MMUCR) ..................................................................... 5-11
5.5.3.4 MMU Operation Register (MMUOR) .................................................................. 5-12
5.5.3.5 MMU Status Register (MMUSR) ......................................................................... 5-14
5.5.3.6 MMU Fault, Test, or TLB Address Register (MMUAR) ..................................... 5-15
5.5.3.7 MMU Read/Write Tag and Data Entry Registers (MMUTR and MMUDR) ...... 5-16
5.5.4 MMU TLB ................................................................................................................ 5-18
5.5.5 MMU Operation ....................................................................................................... 5-19
5.6 MMU Implementation .................................................................................................. 5-20
5.6.1 TLB Address Fields .................................................................................................. 5-20
5.6.2 TLB Replacement Algorithm ................................................................................... 5-21
5.6.3 TLB Locked Entries .................................................................................................. 5-22
5.7 MMU Instructions ......................................................................................................... 5-23
Chapter 6
Floating-Point Unit (FPU)
6.1 Introduction ..................................................................................................................... 6-1
6.1.1 Overview ..................................................................................................................... 6-1
6.1.1.1 Notational Conventions .......................................................................................... 6-1
6.2 Operand Data Formats and Types .................................................................................. 6-3
6.2.1 Signed-Integer Data Formats ...................................................................................... 6-3
6.2.2 Floating-Point Data Formats ....................................................................................... 6-3
6.2.3 Floating-Point Data Types .......................................................................................... 6-4
6.2.3.1 Normalized Numbers .............................................................................................. 6-4
6.2.3.2 Zeros ....................................................................................................................... 6-4
6.2.3.3 Infinities .................................................................................................................. 6-4
6.2.3.4 Not-A-Number ........................................................................................................ 6-5