The following table shows the additional ports used for Auto-Negotiation. These signals are found at the *wrapper.v hierarchy file.
| Port Name | I/O | Description | Clock Domain |
|---|---|---|---|
| an_clk | I | Input Clock for the auto-negotiation circuit. The
required frequency is indicated in the readme file for the release.
It should be a free running clock.
Note: This port
is not accessible to you. This is tied to dclk, which is a
free-running clock.
|
Refer to Clocking. |
| an_reset | I | Asynchronous active-High reset. | Async |
| ctl_autoneg_enable | I | Enable signal for auto-negotiation. | an_clk |
| ctl_autoneg_bypass | I | Input to disable auto-negotiation and bypass the auto-negotiation function. If this input is asserted, then auto-negotiation is turned off, but the PCS is connected to the outputs to allow operation. | an_clk |
| ctl_an_nonce_seed[7:0] | I |
8-bit seed to initialize the nonce field Polynomial generator. This input should always be set to a unique non-zero value for every instance of the auto-negotiator. |
an_clk |
| ctl_an_pseudo_sel | I | Selects the polynomial generator for the bit 49 random BitGenerator. If this input is 1, then the polynomial is x7+x6+1. If this input is zero, then the polynomial is x7+x3+1. | an_clk |
| ctl_restart_negotiation | I | This input is used to trigger a restart of the auto-negotiation, regardless of what state the circuit is currently in. | an_clk |
| ctl_an_local_fault | I | This input signal is used to set the remote_fault bit of the transmit link codeword. | an_clk |
| Signals Used for Pause Ability Advertising | |||
| ctl_an_pause | I | This input signal is used to set the PAUSE bit, (C0), of the transmit link codeword. This signal might not be present if the core does not support pause. | an_clk |
| ctl_an_asmdir | I | This input signal is used to set the ASMDIR bit, (C1), of the transmit link codeword. This signal might not be present if the core does not support pause. | an_clk |
| Ability Signal Inputs | |||
| ctl_an_ability_1000base_kx | I | These inputs identify the Ethernet protocol abilities that is advertised in the transmit link codeword to the link partner. A value of 1 indicates that the interface advertises that it supports the protocol. | an_clk |
| ctl_an_ability_100gbase_cr10 | I | an_clk | |
| ctl_an_ability_100gbase_cr4 | I | an_clk | |
| ctl_an_ability_100gbase_kp4 | I | an_clk | |
| ctl_an_ability_100gbase_kr4 | I | an_clk | |
| ctl_an_ability_10gbase_kr | I | an_clk | |
| ctl_an_ability_10gbase_kx4 | I | an_clk | |
| ctl_an_ability_25gbase_cr | I | an_clk | |
| ctl_an_ability_25gbase_cr1 | I | an_clk | |
| ctl_an_ability_25gbase_kr | I | an_clk | |
| ctl_an_ability_25gbase_kr1 | I | an_clk | |
| ctl_an_ability_40gbase_cr4 | I | an_clk | |
| ctl_an_ability_40gbase_kr4 | I | an_clk | |
| ctl_an_ability_50gbase_cr2 | I | an_clk | |
| ctl_an_ability_50gbase_kr2 | I | an_clk | |
| ctl_an_fec_request | I | Used to control the clause 74 FEC request bit in the transmit link codeword. This signal might not be present if the IP core does not support clause 74 FEC. | an_clk |
| ctl_an_fec_ability_override | I | Used to control the clause 74 FEC ability bit in the transmit link codeword. If this input is set, then the FEC ability bit in the transmit link codeword is cleared. This signal might not be present if the IP core does not support clause 74 FEC. | an_clk |
| ctl_an_cl91_fec_ability | I | This bit is used to indicate clause 91 FEC ability. | an_clk |
| ctl_an_cl91_fec_request | I | This bit is used to request clause 91 FEC. | an_clk |
| stat_an_link_cntl_1000base_kx[1:0] | O |
Link Control outputs from the auto-negotiation
controller for the various Ethernet protocols. Settings are as
follows:
|
an_clk |
| stat_an_link_cntl_100gbase_cr10[1:0] | O | an_clk | |
| stat_an_link_cntl_100gbase_cr4[1:0] | O | an_clk | |
| stat_an_link_cntl_100gbase_kp4[1:0] | O | an_clk | |
| stat_an_link_cntl_100gbase_kr4[1:0] | O | an_clk | |
| stat_an_link_cntl_10gbase_kr[1:0] | O | an_clk | |
| stat_an_link_cntl_10gbase_kx4[1:0] | O | an_clk | |
| stat_an_link_cntl_25gbase_cr[1:0] | O | an_clk | |
| stat_an_link_cntl_25gbase_cr1[1:0] | O | an_clk | |
| stat_an_link_cntl_25gbase_kr[1:0] | O | an_clk | |
| stat_an_link_cntl_25gbase_kr1[1:0] | O | an_clk | |
| stat_an_link_cntl_40gbase_cr4[1:0] | O | an_clk | |
| stat_an_link_cntl_40gbase_kr4[1:0] | O | an_clk | |
| stat_an_link_cntl_50gbase_cr2[1:0] | O | an_clk | |
| stat_an_link_cntl_50gbase_kr2[1:0] | O | an_clk | |
| stat_an_fec_enable | O | Used to enable the use of clause 74 FEC on the link. | an_clk |
| stat_an_rs_fec_enable | O | Used to enable the use of clause 91 FEC on the link. | an_clk |
| stat_an_tx_pause_enable | O | Used to enable station-to-station (global) pause packet generation in the transmit path to control data flow in the receive path. | an_clk |
| stat_an_rx_pause_enable | O | Used to enable station-to-station (global) pause packet interpretation in the receive path, to control data flow from the transmitter. | an_clk |
| stat_an_autoneg_complete | O | Indicates the auto-negotiation is complete and RX link status from the PCS has been received. | an_clk |
| stat_an_parallel_detection_fault | O | Indicated a parallel detection fault during auto-negotiation. | an_clk |
| stat_an_lp_ability_1000base_kx | O | These signals indicate the advertised protocol from the link partner. They all become valid when the output signal stat_AN_lp_Ability_Valid is asserted. A value of 1 indicates that the protocol is advertised as supported by the link partner. | an_clk |
| stat_an_lp_ability_100gbase_cr10 | O | an_clk | |
| stat_an_lp_ability_100gbase_cr4 | O | an_clk | |
| stat_an_lp_ability_100gbase_kp4 | O | an_clk | |
| stat_an_lp_ability_100gbase_kr4 | O | an_clk | |
| stat_an_lp_ability_10gbase_kr | O | an_clk | |
| stat_an_lp_ability_10gbase_kx4 | O | an_clk | |
| stat_an_lp_ability_25gbase_cr | O | an_clk | |
| stat_an_lp_ability_25gbase_kr | O | an_clk | |
| stat_an_lp_ability_40gbase_cr4 | O | an_clk | |
| stat_an_lp_ability_40gbase_kr4 | O | an_clk | |
| stat_an_lp_ability_25gbase_cr1 | O | Indicates the advertised protocol from the link partner. Becomes valid when the output signal stat_AN_lp_Extended_Ability_Valid is asserted. A value of 1 indicates that the protocol is advertised as supported by the link partner. | an_clk |
| stat_an_lp_ability_25gbase_kr1 | O | Indicates the advertised protocol from the link partner. Becomes valid when the output signal stat_AN_lp_Extended_Ability_Valid is asserted. A value of 1 indicates that the protocol is advertised as supported by the link partner. | an_clk |
| stat_an_lp_ability_50gbase_cr2 | O | Indicates the advertised protocol from the link partner. Becomes valid when the output signal stat_AN_lp_Extended_Ability_Valid is asserted. A value of 1 indicates that the protocol is advertised as supported by the link partner. | an_clk |
| stat_an_lp_ability_50gbase_kr2 | O | Indicates the advertised protocol from the link partner. Becomes valid when the output signal stat_AN_lp_Extended_Ability_Valid is asserted. A value of 1 indicates that the protocol is advertised as supported by the link partner. | an_clk |
| stat_an_lp_pause | O | This signal indicates the advertised value of the PAUSE bit, (C0), in the receive link codeword from the link partner. It becomes valid when the output signal stat_AN_lp_Ability_Valid is asserted. | an_clk |
| stat_an_lp_asm_dir | O | This signal indicates the advertised value of the ASMDIR bit, (C1), in the receive link codeword from the link partner. It becomes valid when the output signal stat_AN_lp_Ability_Valid is asserted. | an_clk |
| stat_an_lp_fec_ability | O | This signal indicates the advertised value of the FEC ability bit in the receive link codeword from the link partner. It becomes valid when the output signal stat_AN_lp_Ability_Valid is asserted. | an_clk |
| stat_an_lp_fec_request | O | This signal indicates the advertised value of the FEC Request bit in the receive link codeword from the link partner. It becomes valid when the output signal stat_AN_lp_Ability_Valid is asserted. | an_clk |
| stat_an_lp_autoneg_able | O | This output signal indicates that the link partner is able to perform auto-negotiation. It becomes valid when the output signal stat_AN_lp_Ability_Valid is asserted. | an_clk |
| stat_an_lp_ability_valid | O | This signal indicates when all of the link partner advertisements become valid. | an_clk |
| an_loc_np_data[47:0] | I | Local Next Page codeword. This is the 48-bit codeword used if the loc_np input is set. In this data field, the bits NP, ACK, and T, bit positions 15, 14, 12, and 11, are not transferred as part of the next page codeword. These bits are generated in the Auto-Negotiation Intellectual Property Core (ANIPC). However, the Message Protocol bit, MP, in bit position 13, is transferred. | an_clk |
| an_lp_np_data[47:0] | O | Link Partner Next Page Data. This 48-bit word is driven by the ANIPC with the 48-bit next page codeword from the remote link partner. | an_clk |
| ctl_an_loc_np | I | Local Next Page indicator. If this bit is 1, the ANIPC transfers the next page word at input loc_np_data to the remote link partner. If this bit is 0, the ANIPC does not initiate the next page protocol. If the link partner has next pages to send, and the loc_np bit is clear, the ANIPC transfers null message pages. | an_clk |
| ctl_an_lp_np_ack | I | Link Partner Next Page Acknowledge. This is used to signal the ANIPC that the next page data from the remote link partner at output pin lp_np_data has been read by the local host. When this signal goes High, the ANIPC acknowledges reception of the next page codeword to the remote link partner and initiate transfer of the next codeword. During this time, the ANIPC will remove the lp_np signal until the new next page information is available. | an_clk |
| stat_an_loc_np_ack | O | This signal is used to indicate to the local host that the local next page data, presented at input pin loc_np_data, has been taken. This signal pulses High for 1 clock period when the ANIPC samples the next page data on input pin loc_np_data. When the local host detects this signal High, it must replace the 48-bit next page codeword at input pin loc_np_data with the next 48-bit codeword to be sent. If the local host has no more next pages to send, it must clear the loc_np input. | an_clk |
| stat_an_lp_np | O | Link Partner Next Page. This signal is used to indicate that there is a valid 48-bit next page codeword from the remote link partner at output pin lp_np_data. This signal is driven Low when the lp_np_ack input signal is driven High, indicating that the local host has read the next page data. It remains Low until the next codeword becomes available on the lp_np_data output pin, the lp_np output is driven High again. | an_clk |
| stat_an_lp_ability_extended_fec[1:0] | O | This output indicates the extended FEC abilities as defined in Schedule 3. | an_clk |
| stat_an_lp_extended_ability_valid | O | When this bit is 1, it indicates that the detected extended abilities are valid. | an_clk |
| stat_an_lp_rf | O | This bit indicates link partner remote fault. | an_clk |
| stat_an_start_tx_disable | O | When ctl_autoneg_enable is High and ctl_autoneg_bypass is Low, this signal, stat_an_start_tx_disable, cycles High for 1 clock cycle at the very start of the TX_DISABLE phase of auto-negotiation. That is, when auto-negotiation enters state TX_DISABLE, this output will cycle High for 1 clock period. It effectively signals the start of auto-negotiation. | an_clk |
| stat_an_start_an_good_check | O | When ctl_autoneg_enable is High and ctl_autoneg_bypass is Low, this signal, stat_an_start_an_good_check, cycles High for 1 clock cycle at the very start of the AN_GOOD_CHECK phase of auto-negotiation. That is, when auto-negotiation enters the state AN_GOOD_CHECK, this output will cycle High for 1 clock period. It effectively signals the start of link training. However, if link training is not enabled, that is. if the input ctl_lt_training_enable is Low, the stat_an_start_an_good_check output effectively signals the start of mission-mode operation. | an_clk |