IODelay is a very useful unit in the Xilinx FPGA IO architecture. At least since the Spartan6/Virtex5 era, this technology has been integrated. When many high-speed interfaces are interconnected, we may find IODelay useful. In the latest Ultrascale series of FPGAs, the specific usage of the IODelay unit has changed somewhat compared to the 7Series. This article is summarized for your reference. 1. Usage of IODelay in 7Series FPGA In 7Series, IODelay needs to be used with IOdelayCtrl. The delay step is a total of 64 Taps, and each Tap precision is tREFCLK/64. REFCLK provides three settings, 200Mhz, 300Mhz, and 400Mhz, so the corresponding delay accuracy is: 5ns/64=78ps, 3.333ns/64=52ps, 2.5ns/64=39ps. 2. In Ultrascale FPGA The biggest difference compared to the 7Series is that the IODelayCtrl is compensated for the entire delayline, not a single delay tap element. IODelay provides two user modes for user selection, TIME Mode and COUNT Mode. In TIME Mode, the delay is temperature compensated, so the delay value is more accurate. In COUNT Mode, IDelayCtrl is not used together, and the delay value of each TAP is randomly fixed between 2.5ps and 15ps. Generally we will use TIME Mode, so we will focus on the use of this Mode. In TIME Mode, we can specify the specific value of the delay at the beginning of the IP configuration, in ps, in the range of 0-1250ps. The DELAY_TYPE attribute corresponding to this mode is FIXED. What if we want to dynamically adjust the delay value of IODELAY in TIME Mode? The method is as follows, first need to configure the DELAY_TYPE property to VARIABLE or VAR_LOAD, and then follow the steps below: The correct harness can improve the overall performance of the different headlight parts and increase the lighting output of the headlights. Some harnesses are designed to complement higher performance bulbs. So if you have recently upgraded your headlights, you might need a new harness to keep the new lights performing efficiently. When looking for a new harness, you need to be sure that all the parts of the headlight wire harness kit are of the finest quality-not only the wires but as well as the relays, sockets, and terminals. The parts should be tough and must not be susceptible to burning. Also, check whether the harness is compatible with your vehicle. car headlight harness Dongguan YAC Electric Co,. LTD. , https://www.yacentercn.com
Deassert (Low) the EN_VTC pin.
2. Wait a minimum of 10 clock cycles.
3. Use the CE and INC ports to increment or decrement the delay line.
4. Wait a minimum of 5 clock cycles.
5. (Option for multiple updates) Increment or decrement of the delayline needs to be performed. Go to step 3, or else proceed to step 6.
6. Wait a minimum of 10 clock cycles.
7. Assert the EN_VTC pin.