Technical data

Bit position Bit name R/W
Function
10 Isolate R/W Isolate
Isolates the PHY electrically from MII interface.
Isolate Isolate mode control
0
b
Normal operation (initial value after device reset)
1
b
Puts PHY into isolate 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.
9 Restart Auto-
Negotiation
R/W Restart Auto-Negotiation
Restarts the auto-negotiation process.
Restart Auto-
Negotiation
Auto-negotiation restart control
0
b
Normal operation (initial value)
1
b
Restarts the auto-negotiation process
Note: This bit is self-clearing.
8 Duplex Mode R/W Duplex Mode
Configures the PHY to half or full duplex mode; the setting of this bit is irrele
vant, if auto-negotiation is enabled.
Duplex Mode Duplex mode control
0
b
Select half duplex mode (inital value after device
reset)
1
b
Select full duplex 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.
7 Collision
Test
R/W Collision Test
A
ctivates collision signal test (on internal MII interface)
Collison Test Collision signal test control
0
b
Disable collision signal test (initial value)
1
b
Enable collision signal test
6:0 - R Reserved
Write 0
b
; ignore on read access
Table 12: Basic Control Register Description
Copyright © Siemens AG 2008. All rights reserved. Page 28 ERTEC 200 PHY
Technical data subject to change Version 1.0.0