GD82551IT datasheet(21/102 Pages) INTEL

21 / 102 page

Networking Silicon — 82551IT

Datasheet

5.0

Media Access Control Functional Description

5.1

Device Initialization

The 82551IT has six sources for initialization. They are listed according to their precedence:

1. Internal Power-on Reset (POR)

2. ALTRST# pin

3. RST# pin

4. ISOLATE# pin

5. Software Reset (Software Command)

6. Selective Reset (Software Command)

5.1.1

Initialization Effects

The following table lists the effect of each of the different initialization sources on major portions

of the 82551IT. The initialization sources are listed in order of precedence. For example, any

resource that is initialized by the software reset is also initialized by the D3 to D0 transition and

ALTRST# and PCI RST# but not necessarily by the selective reset.

Table 10. Initialization Effects

Internal

POR

ALTRST#

RST#

ISOLATE#

D3 to D0

Transition

Software

Reset

Selective

Reset

EEPROM read

and initialization

Loadable

microcode

decoded/reset

MAC

configuration

reset and

multicast hash

Memory

pointers and

mircomachine

state reset

???

PCI

Configuration

PHY

configuration

reset

GD82551IT 데이터시트(PDF) 21 Page - Intel Corporation

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