Motorola MPC8240 User Manual page 14

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7.6.2 Error Reporting ............................................................................................. 7-32
7.7 PCI Host and Agent Modes .............................................................................. 7-32
7.7.1 PCI Initialization Options ............................................................................. 7-32
7.7.2 Accessing the MPC8240 Configuration Space............................................. 7-33
7.7.3 PCI Configuration Cycle Retry Capability in Agent Mode.......................... 7-34
7.7.4 PCI Address Translation Support ................................................................. 7-34
7.7.4.1 Inbound PCI Address Translation ............................................................ 7-34
7.7.4.2 Outbound PCI Address Translation.......................................................... 7-34
7.7.4.3 Initialization Code Translation in Agent Mode ........................................ 7-35
8.1 DMA Overview .................................................................................................. 8-1
8.2 DMA Register Summary .................................................................................... 8-2
8.3 DMA Operation .................................................................................................. 8-3
8.3.1 DMA Direct Mode.......................................................................................... 8-4
8.3.2 DMA Chaining Mode ..................................................................................... 8-5
8.3.2.1 Basic Chaining Mode Initialization ............................................................ 8-5
8.3.2.2 Periodic DMA Feature................................................................................ 8-6
8.3.3 DMA Operation Flow..................................................................................... 8-7
8.3.4 DMA Coherency............................................................................................. 8-8
8.3.5 DMA Performance.......................................................................................... 8-8
8.4 DMA Transfer Types.......................................................................................... 8-9
8.4.1 PCI to PCI....................................................................................................... 8-9
8.4.2 PCI to Local Memory ..................................................................................... 8-9
8.4.3 Local Memory to PCI ..................................................................................... 8-9
8.4.4 Local Memory to Local Memory.................................................................... 8-9
8.5 Address Map Interactions ................................................................................. 8-10
8.5.1 Attempted Writes to Local ROM/Port X Space ........................................... 8-10
8.5.2 Host Mode Interactions................................................................................. 8-10
8.5.2.1 PCI Master Abort when PCI Bus Specified for Lower 2-Gbyte Space.... 8-10
8.5.2.2 Address Alias to Lower 2-Gbyte Space.................................................... 8-10
8.5.2.3 Attempted Reads from ROM on the PCI Bus-Host Mode..................... 8-11
8.5.2.4 Attempted Reads from ROM on the Memory Bus ................................... 8-11
8.5.3 Agent Mode Interactions .............................................................................. 8-11
8.5.3.1 Agent Mode DMA Transfers for PCI ....................................................... 8-11
8.5.3.2 Accesses to Outbound Memory Window
8.5.3.3 Attempted Accesses to Local ROM when ROM is on PCI...................... 8-11
8.5.3.4 Attempted Access to ROM on the PCI Bus-Agent Mode ..................... 8-12
8.6 DMA Descriptors for Chaining Mode .............................................................. 8-12
xiv
CONTENTS
Chapter 8
DMA Controller
that Overlaps 0xFE00_00 - 0xFEEF_FFFF ......................................... 8-11
MPC8240 Integrated Processor User's Manual
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