AM79C971VCW Advanced Micro Devices, AM79C971VCW Datasheet - Page 248

• Manufacturer Part Number: AM79C971VCW
• Description: PCnet-FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus
• Manufacturer: Advanced Micro Devices

10
9
8
7
0-6
E-2
IS
RAN
DM
CT
RES
NA (0)
0
0
0
0
Isolate. Defaults to
ZERO after power-up
and after hardware
resets
This bit only applies
to the external PHY.
This bit is used when
multiple PHY’s can be
attached
Am79C971 MII.
Restart
Negotiation. Defaults
to ZERO after power-
up and after hardware
resets ( H_RESET ).
This bit is used when
the software needs to
reset
Negotiation process.
For
external PHY without
software intervention.
Duplex
Defaults
after power-up and
after hardware resets
(H_RESET). This bit
sets the full-duplex
feature for the internal
or external PHY’s.
Only valid when the
Auto-Negotiation
Enable bit is not set.
Collision
Defaults
after power-up and
after hardware resets
(H_RESET). This bit
is
testing the COL pin
on the MII and is not
supported
software intervention.
Reserved
Defaults to all ZEROs
after power-up and
after hardware resets
(H_RESET).
only
use
(H_RESET).
the
useful
to
to
locations.
with
to
without
Mode.
ZERO
ZERO
Auto-
Test.
Auto
the
Am79C971
for
an
Register 1: MII Status Register
Bit
15
14
13
12
11
10-7
Name
100T4
100XFD
100XHD
10FD
10HD
RES
Default
0
0
0
1
1
0
Description
100Base-T4.
Defaults
after power-up and
after hardware resets
(H_RESET).
Indicates
PHY is 100BASE-T4
capable. Not used on
the internal PHY.
100Base-X
Duplex. Defaults to
ZERO after power-up
and after hardware
resets
Indicates
PHY is 100BASE-TX
Full-Duplex capable.
100Base-X
Duplex. Defaults to
ZERO after power-up
and after hardware
resets
Indicates
PHY is 100BASE-TX
Half-Duplex capable.
Not
internal PHY
10Base Full Duplex.
Defaults to ONE after
power-up and after
hardware
(H_RESET).
Indicates
PHY is 10BASE-T
Full-Duplex capable.
10Base Half Duplex.
Defaults to ONE after
power-up and after
hardware
(H_RESET).
Indicates
PHY is 10BASE-T
Half-Duplex capable.
Reserved
These
should be read and
written as ZEROs.
used
(H_RESET).
(H_RESET).
to
that
that
that
that
that
locations.
locations
on
ZERO
resets
resets
Half
Full
the
the
the
the
the
the