Technical data

Bit position Bit name R/W Function
7 AutoMDIX_
en
R/W
A
utoMDIX_en
Enables the state machine for automatic detection of MDI/MDIX mode
AutoMDIX_en Automatic MDI/MDIX detection enable
0
b
State machine for automatic MDI/MDIX detection
disabled (initial value after device reset)
1
b
State machine for automatic MDI/MDIX detection
enabled
Note: The initial value, after only the PHY has been reset, is selected by the
contents of the Pn_AUTOMDIXEN bit in the PHY_CONFIG register.
6 MDI mode R/W MDI mode
Selects MDI or MDIX mode manually
MDI mode Manual MDI/MDIX setting
0
b
Set MDI mode (initial value)
1
b
Set MDIX mode
Note: This bit is only relevant, if the AutoMDIX_en bit is set to 0
b
.
5:4 - R/W Reserved
Write 0
b
; ignore on read access
3 PHYADBP R/W PHYADBP
Causes the PHY to ignore PHY address during SMI write access; this bit can
be used for simultaneous write access to several PHYs
PHYADBP PHY address bypass enable
0
b
Do not ignore PHY address during SMI write
access (initial value)
1
b
Ignore PHY address during SMI write access
2 Force Good
Link Status
R/W Force Good Link Status
Forces an active 100BASE-X link irrespective of what is happening on
the line
Force Good Link
Status
Force active 100BASE-X link
0
b
Normal operation (initial value)
1
b
Force an active 100BASE-X link
Note: This bit should only be used during laboratory testing
1 ENER
GYON
R ENERGYON
Indicates wheter energy is detected on the line. If no (respetively too little)
energy is detected for 256ms, this bit automatically goes to 0
b
.
ENERGYON Energy detected indication
0
b
No sufficient energy level detected (initial value)
1
b
Sufficient energy level detected
0 - R/W Reserved
Write 0
b
; ignore on read access
Table 34: Mode Control/Status Register Description
Copyright © Siemens AG 2008. All rights reserved. Page 44 ERTEC 200 PHY
Technical data subject to change Version 1.0.0