Technical data

Bit position Bit name R/W Function
15 Reset R/W Reset
Resets the complete PHY
Reset Software reset
0
b
Normal operation (initial value)
1
b
Execute a software reset for the affected PHY
Note: This bit is self-clearing; it is automatically set to 0
b
by the reset pro
cess.
14 Loopback R/W Loopback
Controls internal loopback mode
Loopback Internal loopback mode
0
b
Disable internal loopback mode (initial value)
1
b
Enable internal loopback mode
13 Speed
selection
R/W Speed selection
Selects either 10 or 100Mbps transmission speed; the setting of this bit is
irrelevant, if auto-negotiation is enabled.
Speed selection Speed selection function
0
b
Select 10Mbps mode
(initial value after device reset)
1
b
Select 100Mbps mode
Note: The initial value, after only the PHY has been reset, is selected by the
contents of the Pn_PHY_MODE field in the PHY_CONFIG register.
12 Auto-
Negotiation
Enable
R/W
A
uto-Negotiation Enable
Controls the auto-negotiation process
Auto-Negotiation
Enable
Auto-negotiation enable selection
0
b
Disable auto-negotiation (initial value after
device reset)
1
b
Enable auto-negotiation
The initial value, after only the PHY has been reset, is selected by the con
tents of the Pn_PHY_MODE field in the PHY_CONFIG register.
11 PowerDown R/W PowerDown
PowerDown Power down mode control
0
b
Normal operation (initial value)
1
b
Enter general power down mode
Puts the PHYs into power down mode
Copyright © Siemens AG 2008. All rights reserved. Page 27 ERTEC 200 PHY
Technical data subject to change Version 1.0.0