private void ResetTxRingBuffer()
{
ulong descBase;
uint descBaseLo, descBaseHi;
txRingBuffer.Reset();
descBase = txRingBuffer.BaseAddress.ToUInt64();
descBaseLo = (uint)(0xffffffff & descBase);
descBaseHi = (uint)(0xffffffff & (descBase >> 32));
Write32(Register.TSMT_DESC_BASE_LO, ByteOrder.HostToLittleEndian(descBaseLo));
Write32(Register.TSMT_DESC_BASE_HI, ByteOrder.HostToLittleEndian(descBaseHi));
Write32(Register.TSMT_DESC_LENGTH, ByteOrder.HostToLittleEndian(txRingBuffer.DescLength));
Write32(Register.TSMT_DESC_HEAD, ByteOrder.HostToLittleEndian(txRingBuffer.Head));
Write32(Register.TSMT_DESC_TAIL, ByteOrder.HostToLittleEndian(txRingBuffer.Tail));
}