DP83821 datasheet(36/86 Pages) NSC

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4.0 Register Set (Continued)

4.1.5 Configuration IO Base Address Register

This register specifies the Base I/O address which is required to build an address map during configuration. It also

specifies the number of bytes required as well as an indication that it can be mapped into I/O space.

4.1.6 Configuration Memory Address Register

This register specifies the Base Memory address which is required to build an address map during configuration. It also

specifies the number of bytes required as well as an indication that it can be mapped into memory space.

4.1.7 Configuration Memory Address High Dword Register

This register specifies the upper 32-bits of the Base Memory address which is required to build an address map during

configuration.

Tag: CFGIOA

Size: 32 bits

Hard Reset: 00000001h

Offset: 10h

Access: Read Write

Soft Reset: Unchanged

bit

tag

description

usage

31-8

IOBASE

Base IO Address

This is set by software to the base IO address for the Operational Register

Map.

7-2

IOSIZE

Size indication

Read back as 0. This allows the PCI bridge to determine that the DP83821

requires 256 bytes of IO space.

Unused

Unused (reads return 0).

IOIND

IO Space Indicator

Read Only. Set to 1 by DP83821 to indicate that DP83821 is capable of

being mapped into IO space.

Tag: CFGMA

Size: 32 bits

Hard Reset: 00000000h

Offset: 14h

Access: Read Write

Soft Reset: unchanged

bit

tag

description

usage

31-12

MEMBASE

Memory Base Address

This is set by software to the base address for the Operational Register

Map.

11-4

MEMSIZE

Memory Size

These bits return 0, which indicates that the DP83821 requires 4096 bytes

of Memory Space (the minimum recommended allocation).

MEMPF

Prefetchable

Read Only. Set to 0 by DP83821.

2-1

MEMLOC

Location Selection

Read Only. Set to 00 by DP83821 for target 32-bit addressing. Loaded from

EEPROM (location 05h, bit 3) at power-up and is reflected in the

CFG:T64ADDR bit in operational register space. Must be a 0.

MEMIND

Memory Space Indicator

Read Only. Set to 0 by DP83821 to indicate that DP83821 is capable of

being mapped into memory space.

Tag: CFGMA1

Size: 32 bits

Hard Reset: 00000000h

Offset: 18h

Access: Read Write

Soft Reset: unchanged

bit

tag

description

usage

31-0

MEMBASE1

Memory Base High Address

This is set by software to the upper 32-bits of the base address for the

Operational Register Map. This field is read-only and always returns 0.

DP83821 데이터시트(PDF) 36 Page - National Semiconductor (TI)

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