Quad-Lane Settings

Each transceiver quad has four lanes that support Ethernet SGMII, Ethernet 10GBase-KR, and PMA Direct. You do not have to use the same protocol for all of the lanes in a quad: you can mix and match different protocols. For example, you can use PMA Direct for two lanes and Ethernet XGMII for two lanes. However, some settings must be the same for all lanes in a quad. You make these settings in the Quad Lane Settings dialog box. Click the Quad Lane Settings button in the Ethernet SGMII, Ethernet XGMII, or PMA Direct block Base tab to open the dialog box.

Figure 1. Quad-Lane Settings Dialog Box

Table 1. Common PLL Connection SettingsWhere n is 0 or 1.
Parameter Choices Notes
Reference Clock 0 and 1 On, off Turn on to use two reference clocks (0 and 1) for the transceiver quad. In Lane-Based Settings, you need to specific which clock each transceiver block uses.
Reference Clock 0 only On, off Default. Use reference clock 0 as the clock for all lanes in the transceiver quad.
Reference Clock n Frequency (MHz) Enter value or choose preset Click the Select reference clock frequency button next to the box. The Frequency Selector dialog box opens with a list of valid frequencies for the different protocols. Choose one and click OK. You can also enter a value manually.
Reference Clock n Source External You must use an external clock. The Block Editor shows the name of the resource that you should use for this clock.
Enable 50 Ω to ground on-die termination for REFCLKn On, off Default: on. Indicate whether to use on-die termination for the reference clock.
Table 2. Lane-Based SettingsWhere n is 0, 1, 2, or 3.
Parameter Choices Notes
Reference Clock Select Refclk0, Refclk 1 Choose the reference clock to use for the lane. Refclk 1 is only available if you turn on the Reference Clock 0 and 1 option.
Configuration Type Preset, Custom Preset: Choose from one of the presets for the data rate, SerDes width, and reference clock frequency.
Custom: Specify the data rate, SerDes width, and reference clock frequency yourself.
Data Rate (Gbps) 1.188 to 12.5 Specify the data rate. Only available for the Custom configuration type.1
Default 12.5
SerDes Width (Bits) 20 bits, 32 bits, 40 bits, 64 bits Choose the width. Only available for the Custom configuration type.
Default: 40 bits
Calculate – After specifying the data rate and SerDes width, click Calculate to show the actual data rate that the transceiver can achieve. Only available for the Custom configuration type.
Select Preset
1.25 Gbps-100.0 MHz-20 Bits
1.25 Gbps-100.0 MHz-40 Bits
1.485 Gbps-148.5 MHz-20 Bits
1.485 Gbps-148.5 MHz-40 Bits
2.376 Gbps-148.5 MHz-20 Bits
2.376 Gbps-148.5 MHz-40 Bits
2.5 Gbps-100.0 MHz-20 Bits
2.5 Gbps-100.0 MHz-40 Bits
2.7 Gbps-100.0 MHz-20 Bits
2.7 Gbps-100.0 MHz-40 Bits
2.97 Gbps-148.5 MHz-20 Bits
2.97 Gbps-148.5 MHz-40 Bits
3.125 Gbps-156.25 MHz-20 Bits
3.125 Gbps-156.25 MHz-40 Bits
4.752 Gbps-148.5 MHz-20 Bits
4.752 Gbps-148.5 MHz-40 Bits
5.0 Gbps-100.0 MHz-20 Bits
5.0 Gbps-100.0 MHz-40 Bits
5.0 Gbps-156.25 MHz-20 Bits
5.0 Gbps-156.25 MHz-40 Bits
5.4 Gbps-100.0 MHz-20 Bits
5.4 Gbps-100.0 MHz-40 Bits
5.94 Gbps-148.5 MHz-20 Bits
5.94 Gbps-148.5 MHz-40 Bits
6.25 Gbps-100.0 MHz-20 Bits
6.25 Gbps-100.0 MHz-40 Bits
6.375 Gbps-100.0 MHz-40 Bits
6.75 Gbps-100.0 MHz-40 Bits
8.0 Gbps-100.0 MHz-40 Bits
8.1 Gbps-50.0 MHz-40 Bits
8.1 Gbps-75.0 MHz-40 Bits
8.1 Gbps-90.0 MHz-40 Bits
(continued)
PMA Direct only.
Choose the data rate (in Gbps), reference clock frequency (in MHz), and SerDes width combination. Your selection displays in the GUI.
Data rates higher than 10.3125 Gbps are only supported in C4, I4, C4L, I4L speed grades.
Select Preset (continued)
9.504 Gbps-148.5 MHz-40 Bits
10.0 Gbps-100.0 MHz-40 Bits
10.0 Gbps-156.25 MHz-40 Bits
10.3125 Gbps-156.25 MHz-40 Bits
11.88 Gbps-148.5 MHz-40 Bits
12.5 Gbps-100.0 MHz-40 Bits
12.5 Gbps-156.25 MHz-40 Bits
Apply Setting to bonded lanes Click button Use this button to copy all settings to the other PMA Direct transceiver lanes. This button only works for lanes that have the same bonding mode, and the bonding mode must be x2, x4, or x8. If the bonding modes are not the same, clicking the button has no effect. You set the bonding mode in the Control Register tab.
Refer to PMA Direct Bonding Mode for more details.

Click Verify to perform a design check. The Console shows any resulting error or warning messages.

1 Use a reference clock frequency of 74.25 MHz for the 1.188 Gbps data rate.