C# FX22MB_REG0_START_RX command CORRECTLY used

...
int packetlen = 51200;//102400 for TE0320 and TE0630 modules;
int packets = 600;//1200 for TE0320 and TE0630 modules;
byte[] data = new byte[packetlen*packets]; 
byte[] buffer = new byte[packetlen];
int PI_EP8 = 8;
uint TIMEOUT_MS = 1000;
int BUFFER_SIZE = 102400;
... 
Stopwatch stopWatch = new Stopwatch();
//StopWatch timer starts
stopWatch.Start();
//Write USB data test starts
SendFPGAcommand(ref TE_USB_FX2_USBDevice, MB_Commands.FX22MB_REG0_START_RX, TIMEOUT_MS);
test_cnt = 0;
total_cnt = 0;
for (int i = 0; i < packets; i++)
{
     packetlen = PACKETLENGTH;
     Buffer.BlockCopy(data, total_cnt, buffer, 0, packetlen);
     TE_USB_FX2.TE_USB_FX2.TE_USB_FX2_GetData(ref TE_USB_FX2_USBDevice, ref buffer, ref packetlen, PI_EP8, TIMEOUT_MS,BUFFER_SIZE);
     total_cnt += packetlen;
}
//Write USB data test ends
SendFPGAcommand(ref TE_USB_FX2_USBDevice, MB_Commands.FX22MB_REG0_STOP, TIMEOUT_MS);
//StopWatch timer stops
stopWatch.Stop();
TimeSpan ts = stopWatch.Elapsed;
...