Visible to Intel only — GUID: day1600590221683
Ixiasoft
Visible to Intel only — GUID: day1600590221683
Ixiasoft
7.5. RX MAC Segmented Client Interface
The F-Tile Ethernet Intel® FPGA Hard IP RX client interface allows the application to read frame data from the RX MAC segmented when it is received. Packets may start on any 8-byte segment.
Name |
Width |
Description |
---|---|---|
o_rx_mac_data[1023:0] o_rx_mac_data[511:0] o_rx_mac_data[255:0] o_rx_mac_data[127:0] o_rx_mac_data[63:0] |
1024 bits (400GE) 512 bits (200GE) 256 bits (100GE) 128 bits (50GE/40GE) 64 bits (25GE/10GE) |
Output data to the MAC when the rate is 10GE/25/40GE/50GE/100GE/200GE/400GE. Bit 0 is the LSB. |
o_rx_mac_valid |
1 bit | When asserted, indicates that RX data is valid on this cycle When deasserted, ignore the signals value. |
i_rx_mac_inframe[15:0] i_rx_mac_inframe[7:0] i_rx_mac_inframe[3:0] i_rx_mac_inframe[1:0] i_rx_mac_inframe[0] |
16 bits (400GE) 8 bits (200GE) 4 bits (100GE) 2 bits (50GE/40GE) 1 bit (25GE/10GE) |
Indicates the valid data in each EMIB. With the previous segment's inframe signal, indicates the SOP and EOP location. Each segment is 64 bits. |
o_rx_mac_eop_empty[47:0] o_rx_mac_eop_empty[23:0] o_rx_mac_eop_empty[11:0] o_rx_mac_eop_empty[5:0] o_rx_mac_eop_empty[2:0] |
48 bits (400GE) 24 bits (200GE) 12 bits (100GE) 6 bits (50GE/40GE) 3 bits (25GE/10GE) |
Indicates the number of empty bytes on the RX data signal where EOC occurs, starting from the most significant byte (MSB). |
o_rx_mac_fcs_error[15:0] o_rx_mac_fcs_error[7:0] o_rx_mac_fcs_error[3:0] o_rx_mac_fcs_error[1:0] o_rx_mac_fcs_error[0] |
16 bits (400GE) 8 bits (200GE) 4 bits (100GE) 2 bits (50GE/40GE) 1 bit (25GE/10GE) |
Indicates that the currently ending frame has an error. Valid only on EOP segments. A valid high on this signal indicates that the frame that is ending either had an FCS error, was malformed, was undersized, or was oversized and truncated because the MTU enforcement feature of the RX MAC was enabled. |
o_rx_mac_error[31:0] o_rx_mac_error[15:0] o_rx_mac_error[7:0] o_rx_mac_error[3:0] o_rx_mac_error[1:0] |
32 bits (400GE) 16 bits (200GE) 8 bits (100GE) 4 bits (50GE/40GE) 1 bit (25GE/10GE) |
Indicates that the currently ending frame has a decoding error. The [1:0] bits for each segment accept values 0, 1, 2, and 3, and report different types of errors:
|
o_rx_mac_status_data[47:0] o_rx_mac_status_data[23:0] o_rx_mac_status_data[11:0] o_rx_mac_status_data[5:0] o_rx_mac_status_data[2:0] |
48 bits (400GE) 24 bits (200GE) 12 bits (100GE) 6 bits (50GE/40GE) 3 bits (25GE/10GE) |
Specifies information about the received frame. If multiple status occur, the status is reported in 5, 4, 7, 6, 1, 2, 3, 0 priority order. The individual bits report different information:
|
The figure above shows how to receive data using the RX MAC segmented client interface.
- Packets may start on any 8-byte segment of i_tx_mac_data (Segmented). The i_tx_mac_inframe transition from 0 to 1 (between two consecutive segments) indicates a start of packet (SOP). The SOP begins at a segment where o_rx_mac_frame is set to 1.
- For multisegmented interfaces, a new packet may start and the previous packet end are within the same cycle.
- When the packet ends, o_rx_mac_eop_empty is set to the number of unused bytes in o_rx_mac_data.
- The o_rx_mac_eop_empty transition from 1 to 0 (between two consecutive segments) indicates the end of packet (EOP). The EOP ends in the segment where o_rx_mac_inframe is set to 0.
- The minimum number of bytes on the last cycle is 1.