RTC=B_0x0, RFD=B_0x0
R0 queue 0 operating mode register
| RTC | Receive Queue Threshold Control 0 (B_0x0): 64 1 (B_0x1): 32 2 (B_0x2): 96 3 (B_0x3): 128  |  
| FUP | Forward Undersized Good Packets  |  
| FEP | Forward Error Packets  |  
| RSF | Receive Queue Store and Forward  |  
| DIS_TCP_EF | Disable Dropping of TCP/IP Checksum Error Packets  |  
| EHFC | Enable Hardware Flow Control  |  
| RFA | Threshold for Activating Flow Control (in Half-duplex and Full-duplex)  |  
| RFD | Threshold for Deactivating Flow Control (in Half-duplex and Full-duplex modes) 0 (B_0x0): Full minus 1 Kbyte 1 (B_0x1): Full minus 1.5 Kbyte  |  
| RQS | Receive Queue Size  |