Visible to Intel only — GUID: nfa1420541696709
Ixiasoft
Visible to Intel only — GUID: nfa1420541696709
Ixiasoft
2.6.5.5.3. GMII Signals
The 16-bit TX and RX GMII supports 1GbE and 2.5GbE at 62.5 MHz and 156.25 MHz respectively.
Signal Name | Direction | Width | Description |
---|---|---|---|
TX GMII signals—synchronous to tx_clkout | |||
gmii16b_tx_d | Input |
16 |
TX data from the MAC. The MAC sends the lower byte first followed by the upper byte. |
gmii16b_tx_en | Input |
2 |
When asserted, indicates the start of a new frame from the MAC. Bit[0] corresponds to gmii16b_tx_d[7:0]; bit[1] corresponds to gmii16b_tx_d[15:8]. This signal remains asserted until the PHY receives the last byte of the data frame. |
gmii16b_tx_err | Input |
2 |
When asserted, indicates an error. Bit[0] corresponds to gmii16b_tx_err[7:0]; bit[1] corresponds to gmii16b_tx_err[15:8]. The bits can be asserted at any time during a frame transfer to indicate an error in the current frame. |
gmii16b_tx_latency | Output | 22 | The latency of the PHY excluding the PMA block on the TX datapath:
This signal is available when only the Enable IEEE 1588 Precision Time Protocol parameter is selected. |
RX GMII signals—synchronous to rx_clkout | |||
gmii16b_rx_d | Output |
16 |
RX data to the MAC. The PHY sends the lower byte first followed by the upper byte. Rate matching is done by the PHY on the RX data from the RX recovered clock to rx_clkout. |
gmii16b_rx_err | Output |
2 |
When asserted, indicates an error. Bit[0] corresponds to gmii16b_rx_err[7:0]; bit[1] corresponds to gmii16b_rx_err[15:8]. The bits can be asserted at any time during a frame transfer to indicate an error in the current frame. |
gmii16b_rx_dv | Output |
2 |
When asserted, indicates the start of a new frame. Bit[0] corresponds to gmii16b_rx_d[7:0]; bit[1] corresponds to gmii16b_rx_d[15:8]. This signal remains asserted until the PHY sends the last byte of the data frame. |
gmii16b_rx_latency | Output | 22 | The latency of the PHY excluding the PMA block on the RX datapath:
This signal is available only when the Enable IEEE 1588 Precision Time Protocol parameter is selected. |