High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
BITS
DESCRIPTION
TYPE
DEFAULT
9
Restart Auto-Negotiation (PHY_RST_AN)
When set, this bit restarts the Auto-Negotiation process.
R/W
SC
0b
0: Normal operation
1: Auto-Negotiation restarted
8
7
Duplex Mode (PHY_DUPLEX)
R/W
R/W
Note 14.51
This bit is used to set the duplex when the Auto-Negotiation (PHY_AN) bit
is disabled.
0: Half Duplex
1: Full Duplex
Collision Test Mode (PHY_COL_TEST)
0b
This bit enables/disables the collision test mode of the Port x PHY. When
set, the collision signal is active during transmission. It is recommended that
this feature be used only in loopback mode.
0: Collision test mode disabled
1: Collision test mode enabled
6:0
RESERVED
RO
-
Note 14.49 The default value of this bit is determined by the logical OR of the Auto-Negotiation strap
(autoneg_strap_1 for Port 1 PHY, autoneg_strap_2 for Port 2 PHY) and the speed select
strap (speed_strap_1 for Port 1 PHY, speed_strap_2 for Port 2 PHY). Essentially, if the
Auto-Negotiation strap is set, the default value is 1, otherwise the default is determined by
the value of the speed select strap. Refer to Section 4.2.4, "Configuration Straps," on
page 40 for more information.
Note 14.50 The default value of this bit is determined by the value of the Auto-Negotiation strap
(autoneg_strap_1 for Port 1 PHY, autoneg_strap_2 for Port 2 PHY). Refer to Section 4.2.4,
"Configuration Straps," on page 40 for more information.
Note 14.51 The default value of this bit is determined by the logical AND of the negation of the Auto-
Negotiation strap (autoneg_strap_1 for Port 1 PHY, autoneg_strap_2 for Port 2 PHY) and
the duplex select strap (duplex_strap_1 for Port 1 PHY, duplex_strap_2 for Port 2 PHY).
Essentially, if the Auto-Negotiation strap is set, the default value is 0, otherwise the default
is determined by the value of the duplex select strap. Refer to Section 4.2.4, "Configuration
Straps," on page 40 for more information.
SMSC LAN9312
289
Revision 1.2 (04-08-08)
DATASHEET
SMSC [ SMSC CORPORATION ]
