FingerVein Online
Installation and Programming Manual
Page
31 of 69
The normal operation of this parameter is as follows:
1. Based on the default value (
$07
), which takes us through the tree negotiation steps:
self-negotiation (
$04
), manual negotiation to 100 BaseT (
$02
) and manual
negotiation to 10 BaseT (
$01
).
2. After obtaining the negotiation, the value of the
CFG_ePHY
parameter reflects its
result (e.g. a value of
$06
), indicating that self-negotiation to 100 BaseT has been
successful.
3. If a speed cannot be negotiated, the value
$07
is maintained, which leaves all the
alternatives open for the next time the electronics is restarted. Likewise, ePHY is
configured to 100 BaseT, as it is the most common speed.
The improvements introduced with this parameter are visible for the following cases:
• 10 BaseT with no self-negotiation capacity: value
$01
can be set manually and
initialisation of the electronics will be faster.
• Connect to the Host via the UART: value
$08
can be set manually and the
initialisation of the electronics will be faster.
Collateral effects: if the connection speed is to be changed, make sure value
$07
is
restored or restart the electronics a couple of times.
In general, the
CFG_ePHY
parameter does not have to be modified and consulting it will
indicate the type of Ethernet connection established.
Table 11: ePHY configuration values
CFG_ePHY
Ethernet negotiation
$08
Ethernet connection disabled
$07
Allows all cases (default value)
$06
Self-negotiation, 100 BaseT
$05
Self-negotiation, 10 BaseT
$02
Manual negotiation, 100 BaseT
$01
Manual negotiation, 10 BaseT
