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14 Platform Notes: The hme Fast Ethernet Device Driver—May 1996
3
Selecting the Internal or External Transceiver
Use the use_int_xcvr parameter to change the default behavior. For
example, you can select the internal transceiver, even though the driver is
capable of selecting the external transceiver. The driver, not the hardware,
makes the selection between the internal and external transceiver.
If the external transceiver, which is connected to the MII interface, is present,
the driver selects the external transceiver using the default use_int_xcvr 0.
If the external transceiver is not present, the driver selects the internal
transceiver. When this parameter is set to use_int_xcvr 1, the driver
selects the internal transceiver, even if the external transceiver is connected.
1. The priority (in descending order) for these parameters is: adv_100T4_cap, adv_100fdx_cap, adv_100hdx_cap, adv_10fdx_cap,
adv_10hdx_cap
adv_10fdx_cap
1
0
1
Local transceiver capability advertised by the hardware; read/write parameter
= Not 10Mbit/sec full-duplex capable (default)
= 10Mbit/sec full-duplex capable
adv_10hdx_cap
1
0
1
Local transceiver capability advertised by the hardware; read/write parameter
= Not 10Mbit/sec half-duplex capable
= 10Mbit/sec half-duplex capable (default)
use_int_xcvr
0
1
Local transceiver capability selected for networking by the user
= External transceiver is used if connected (default)
= Internal transceiver is used, even if the external transceiver is connected
Table 3-5 Operational Mode Parameters (Continued)
Parameter Values Description