WG82574L S LBA8 Intel, WG82574L S LBA8 Datasheet - Page 272

• Manufacturer Part Number: WG82574L S LBA8
• Manufacturer: Intel

Specifications of WG82574L S LBA8

• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: 0C to 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 64
• Lead Free Status / RoHS Status: Compliant

10.0
10.1
Table 76.
10.1.1
10.1.1.1
10.1.1.2
10.1.1.3
272
Driver Programing Interface
Introduction
This chapter details the programmer visible state inside the 82574. In some cases, it
describes hardware structures invisible to software in order to clarify a concept.
The 82574's address space is mapped into four regions. These regions are listed in
Table
82574 Address Space
Both the Flash and Expansion ROM Base Address Registers (BARs) map the same Flash
memory.
The internal registers, memories, and Flash can be accessed though I/O space
indirectly, as explained in the sections that follow.
Memory and I/O Address Decoding
Memory-Mapped Access to Internal Registers and Memories
The internal registers and memories can be accessed as direct memory-mapped offsets
from the Base Address Register 0 (BAR0). The appropriate offset for each specific
internal register is described in this section.
Memory-Mapped Access to Flash
The external Flash can be accessed using direct memory-mapped offsets from the Flash
Base Address Register 1 (BAR1). The Flash is only accessible if enabled through the
NVM Initialization Control Word, and if the Flash BAR1 contains a valid (non-zero) base
memory address. For accesses, the offset from the Flash BAR1 corresponds to the
offset into the Flash actual physical memory space.
Memory-Mapped Access to MSI-X Tables
The MSI-X tables can be accessed as direct memory-mapped offsets from the Base
Address Register 3 (BAR3). The appropriate offset for each specific internal register is
described in this section.
Internal registers and memories
Flash (optional)
Expansion ROM (optional)
Internal registers and memories, FLASH (optional)
MSI-X (optional)
76:
Addressable Content
82574 GbE Controller—Driver Programing Interface
Direct memory-mapped
Direct memory-mapped
I/O window mapped
Direct memory mapped
Direct memory mapped
How Mapped
128 KB
64 KB-16 MB
2 KB-256 KB
32 bytes
16 KB
Size of Region