Visible to Intel only — GUID: nik1398984173215
Ixiasoft
Visible to Intel only — GUID: nik1398984173215
Ixiasoft
11.4. General Options Parameters
The following table lists the settings available on General Options tab:
Name |
Value |
Description |
---|---|---|
Device family |
Stratix V |
This IP core is only available for Stratix V devices. |
Datapath type |
Standard 10G GT |
The Low Latency PHY IP Core is part of a Standard, 10G, or GT datapath. In most cases the FPGA fabric transceiver interface width determines the bandwidth of the datapath; however, when the FPGA fabric transceiver interface width is 32 or 40 bits, you have the option of using either the Standard datapath which is the default mode, or changing to the 10G datapath by selecting this option. Refer to Table 151 Datapath Width Support for a comprehensive list of datapath support. |
Mode of operation |
Duplex RX TX |
Specifies the mode of operation as Duplex, RX, or TX mode. |
Number of lanes |
1-32 |
Specifies the total number of lanes in each direction. Stratix V devices include up to 32 GX channels (Standard or 10G) and up to 4 GT channels. You must instantiate each GT channel in a separate Low Latency PHY IP Core instance. You cannot specify both GX and GT channels within the same instance. |
Enable lane bonding |
On/Off |
When enabled, the PMA uses the same clock source for up to 6 channels in a transceiver bank, reducing clock skew. Turn this option Off if you are using multiple TX PLLs in a single Low Latency PHY IP Core instance. |
Bonding mode |
×N fb_compensation |
Select ×N to use the same clock source for up to 6 channels in a single transceiver bank, resulting in reduced clock skew. You must use contiguous channels when you select ×N bonding. In addition, you must place logical channel 0 in either physical channel 1 or 4. Physical channels 1 and 4 are indirect drivers of the ×N clock network. Select fb_compensation (feedback compensation) to use the same clock source for multiple channels across different transceiver banks to reduce clock skew. For more information about bonding, refer to “Bonded Channel Configurations Using the PLL Feedback Compensation Path” in Transceiver Clocking in Stratix V Devices in volume 2 of the Stratix V Device Handbook. |
FPGA fabric transceiver interface width |
8, 10, 16, 20, 32, 40, 50, 64, 66, 128 |
This option indicates the parallel data fabric transceiver interface width. GT datapath supports a single width of 128 bits. Refer to Table 151 Datapath Width Support for the supported interface widths of the Standard and 10G datapaths. |
PCS PMA interface width |
8, 10, 16, 20, 30, 32, 64 |
The PCS-PMA interface width depends on the FPGA fabric transceiver interface width and the Datapath type. Refer to Datapath Width Support for the supported interface widths of the Standard and 10G datapaths. |
PLL type |
CMU ATX |
The CMU PLL is available for the Standard and 10G datapaths. The ATX PLL is available for the Standard, 10G, and GT datapaths. The CMU PLL has a larger frequency range than the ATX PLL. The ATX PLL is designed to improve jitter performance and achieves lower channel-to-channel skew; however, it supports a narrower range of data rates and reference clock frequencies. Another advantage of the ATX PLL is that it does not use a transceiver channel, while the CMU PLL does. An informational message displays in the message panel if the PLL type that you select is not available at the frequency specified. |
Data rate |
Device dependent |
Specifies the data rate in Mbps. Refer to Stratix V Device Datasheet for the data rate ranges of datapath. |
Base data rate |
1 × Data rate 2 × Data rate 4 × Data rate |
Select a base data rate that minimizes the number of PLLs required to generate all the clocks required for data transmission. By selecting an appropriate base data rate, you can change data rates by changing the divider used by the clock generation block. For higher frequency data rates 2 × and 4× base data rates are not available. |
Input clock frequency |
Variable |
Specifies the frequency of the PLL input reference clock. The Input clock frequency drop down menu is populated with all valid frequencies derived as a function of the data rate and base data rate. However, if you select fb_compensation as the bonding mode, then the input reference clock frequency is limited to the (data rate) / (PCS-PMA interface width). |
The following table lists Standard and 10G datapath widths for the FPGA fabric-transceiver interface, the PCS-PMA interface, and the resulting frequencies for the tx_clkout and rx_clkout parallel clocks. In almost all cases, the parallel clock frequency is described by the following equation:
frequencyparallel clock = data rate/FPGA fabrictransceiver interface width
FPGA Fabric - Transceiver Interface Width |
PCS-PMA Interface Width | tx_clkout and rx_clkout frequency |
|
---|---|---|---|
Standard Datapath |
10G Datapath | ||
8 |
8 |
— |
data rate/8 |
10 |
10 |
— |
data rate/10 |
16 |
8 or 16 |
— |
data rate/16 |
20 |
10 or 20 |
— |
data rate/20 |
32 |
16 |
32 |
data rate/32 |
40 |
20 |
40 |
data rate/40 |
50 |
— |
40 |
data rate/50 7 |
64 |
— |
32 |
data rate/32 8 |
64 |
— |
64 |
data rate/64 |
66 |
— |
40 |
data rate/66 |