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SMSC LAN91C111 32/16/8-Bit Three-In-One Fast Ethernet Controller
Revision 1.0 (08-14-08) 46 SMSC AN 9.6
APPLICATION NOTE
outport(0x308, 0x333D);\
outport(0x308, 0x3339);
#define WriteZToPhy \
outport(0x308, 0x3330);\
outport(0x308, 0x3334);\
outport(0x308, 0x3330);
void WriteToPhyReg(char RegNo, int Data)
{
BankSelect(3);
//Write atleast 32 1's to Synchronize the interface.
for (int i=0; i<=31; i++)
{
outport(0x308, 0x3339);
outport(0x308, 0x333D);
}
//Start bits <01>
WriteZeroToPhy;
WriteOneToPhy;
//Command bits <Write=01>
WriteZeroToPhy;
WriteOneToPhy;
//Phy Address, which is 00000 for LAN91C111's internal PHY
WriteZeroToPhy;
WriteZeroToPhy;
WriteZeroToPhy;
WriteZeroToPhy;
WriteZeroToPhy;
//PHY reg to write.. 5 bits.. (MSBit goes first)
for (i=0; i<5; i++)
{
if (RegNo & 0x10)
{ WriteOneToPhy;}
else
{ WriteZeroToPhy;}
RegNo <<= 1;
}
//Send the turnaround bit <10>
WriteOneToPhy;
WriteOneToPhy;
for (i=0; i<16; i++)