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Hardware
3.4
VIA VT6510B Ethernet Switch
The SPT711xPFCE has an on-board 10 port (2 × MII, 8 × RMII) Ethernet switch connected to both CMC
sites and all four DSP devices. The Ethernet switch is a VIA VT6510B (http://www.vntek.com).
Example 1 provides basic initialization code for the switch through a host controller connected to the
CPLD host interface and using the memory map described in Section 6 , CPLD Memory Map, on page 24.
Code Listing 1. VIA Switch Initialization Code
/***************************************************************************
* PFC Ethernet Switch Initialization Routines
*
***************************************************************************/
void writeSwitchReg(unsigned int _addr, unsigned char _data)
{
*pdk_bd_regs.u711xpfc.sw_addr_l = (unsigned short)(_addr%256);
*pdk_bd_regs.u711xpfc.sw_addr_h = (unsigned short)(_addr/256);
*pdk_bd_regs.u711xpfc.sw_reg_data = (unsigned short)(_data);
pdk_waste_clks_10(1000);
}
unsigned char readSwitchReg(unsigned int _addr)
{
unsigned char readData = 0;
*pdk_bd_regs.u711xpfc.sw_addr_l = (unsigned short)(_addr%256);
*pdk_bd_regs.u711xpfc.sw_addr_h = (unsigned short)(_addr/256);
readData = (unsigned char) *pdk_bd_regs.u711xpfc.sw_reg_data;
pdk_waste_clks_10(1000);
return readData;
}
void enableSwitchPhyAutoPolling()
{
while ((readSwitchReg(0x0405) & 1) != 0);
writeSwitchReg(0x0404, 0x08); // Enable Auto Polling;
while ((readSwitchReg(0x0405) & 1) != 0);
}
void disableSwitchPhyAutoPolling()
{
while ((readSwitchReg(0x0405) & 1) != 0);
writeSwitchReg(0x0404, 0x04); // Disable Auto Polling;
while ((readSwitchReg(0x0405) & 1) != 0);
}
// _addr = {4-bit-port-num, 3’b000, 5-bit-reg-num}
void writeSwitchPhy(unsigned short _addr, unsigned short _data)
{
// Note - Autopolling mode must be disabled
while ((readSwitchReg(0x0405) & 1) != 0);
writeSwitchReg(0x0400, (unsigned char)((_addr >> 8) & 0x000f));
writeSwitchReg(0x0401, (unsigned char)(_addr & 0x1f));
writeSwitchReg(0x0402, (unsigned char)(_data%256));
writeSwitchReg(0x0403, (unsigned char)(_data/256));
writeSwitchReg(0x0404, 0x01); // Write to Phy;
MSC711x Packet Telephony Farm Card (SPT711xPFCE), Rev. 1
Freescale Semiconductor
13
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