32.7.2 Statistics Registers
Statistics registers are described in the user interface beginning with GMAC Octets Transmitted Low Register and ending with GMAC UDP Checksum Errors Register.
The statistics register block begins at 0x1100 and runs to 0x11B0, and comprises the registers listed below.
| Octets Transmitted Low Register | Broadcast Frames Received Register |
| Octets Transmitted High Register | Multicast Frames Received Register |
| Frames Transmitted Register | Pause Frames Received Register |
| Broadcast Frames Transmitted Register | 64 Byte Frames Received Register |
| Multicast Frames Transmitted Register | 65 to 127 Byte Frames Received Register |
| Pause Frames Transmitted Register | 128 to 255 Byte Frames Received Register |
| 64 Byte Frames Transmitted Register | 256 to 511 Byte Frames Received Register |
| 65 to 127 Byte Frames Transmitted Register | 512 to 1023 Byte Frames Received Register |
| 128 to 255 Byte Frames Transmitted Register | 1024 to 1518 Byte Frames Received Register |
| 256 to 511 Byte Frames Transmitted Register | 1519 to Maximum Byte Frames Received Register |
| 512 to 1023 Byte Frames Transmitted Register | Undersize Frames Received Register |
| 1024 to 1518 Byte Frames Transmitted Register | Oversize Frames Received Register |
| Greater Than 1518 Byte Frames Transmitted Register | Jabbers Received Register |
| Transmit Underruns Register | Frame Check Sequence Errors Register |
| Single Collision Frames Register | Length Field Frame Errors Register |
| Multiple Collision Frames Register | Receive Symbol Errors Register |
| Excessive Collisions Register | Alignment Errors Register |
| Late Collisions Register | Receive Resource Errors Register |
| Deferred Transmission Frames Register | Receive Overrun Register |
| Carrier Sense Errors Register | IP Header Checksum Errors Register |
| Octets Received Low Register | TCP Checksum Errors Register |
| Octets Received High Register | UDP Checksum Errors Register |
| Frames Received Register |
These registers reset to zero on a read and stick at all ones when they count to their maximum value. They should be read frequently enough to prevent loss of data.
The receive statistics registers are only incremented when the receive enable bit (RXEN) is set in the Network Control register.
Once a statistics register has been read, it is automatically cleared. When reading the Octets Transmitted and Octets Received registers, bits 31:0 should be read prior to bits 47:32 to ensure reliable operation.