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116 Threads found on Global Clock
I don't find a lot of use in describing a clock net as global / local. Most non-trivial designs will tend to have more then one clock domain. And they should all be considered global. Bifurcation of clocks inside an FPGA should only be done via a dedicated component that has access to dedicated (...)
The global timing analysis is what should dictate the need of a specific scheme for clocking these modules either with distinct phases, or the actual clock, I guess.
As FvM states learn about timing
For doing CTS in SOC Encounter, I created the clock tree specification file by selecting the available clock buffers from my library. When I look into the .ctstch file, I see lots of pins described as globally excluded pins. A few pins from the report are added here. #Excluded pin under I_ZMCU/I_BEXTBUS/I_BCKP/UCKP004/usb_ce_reg/CLK Gl
BUG is a global buffer. BUFGs are used for clocks and resets.This warning is on the reset pin. It should be ok to proceed.
Hi I have designed a sequential cell that computes a logic function. I want to use this cell as combinational cell because both its clock and data are generated independently (there is no global clock). Therefore I am using data-to-data setup check in RTL compiler. I am able to let the tool know that such checks should be performed (...)
Initialization 1. set timer 0 as counter by using T0CKI clock input 2. set the corresponding bit in TRISx register which connects to T0CKI external clock to 1. 3. set an interrupt for timer0 in interrupt routine. Normal operation 1. when interrupt occurs add one to a static or global variable 2. update it to a LCD display or on UART or reset (...)
Hi, Do you know any good arguments why dont connect clock from ADC (96MHz) (DCO) to non global clock pin in FPGA ? We got a discussion and our one PCB guy says it doesnt matter cause compiler place it global clock line inside fpga and timequest with creat clock 80Mhz will do all the job, (...)
Hi Does anyone know how to implement global clock gating in RTL. What if i want clock gating in RTL, block by block or instance by instance, what am i do in this scale(each huge function blocks clock gating or instance clock gating)
For Cyclone III and IV, a clock input can reach two PLLs directly and the other two through clock control blocks and global clock networks. The indirect connection involves slightly increased jitter.
Hi all, im using cadence encounter. For CTS we give tool, clock tree spec file that has inputs like min phase delay , max phase delay and max skew paramters etc. My understanding is that Max skew parameter that we are mentioning is of global skew but not local skew. My question is Why mention global skew numbers when u already provide (...)
Hi. I try to global clock gating with set_clock _gating_style -sequential_cell latch ₩ -control_point before ₩ -control_signal scan_enable ₩ -minimum_bitwidth 3 -max_fanout 64 -num_stage 1 -positive_edge_logic {integrated} ... ... compile_ultra -gate_clock -no_autoungroup (...)
hello I am using STM32f100C8 on this controller implemented : *Tim4 that work as global clock for all the functions (generating ticks and counter with flags compare to seconds ) *Tim3 work as PWM but it implemented manually using the timer4 ticks as I put the port high and low manually after checking the timer and the port status (all thes
Hi Everyone, Design: I have 2 decoder written in Verilog, and a test bench to generate the decoder input and clock. I have imported all the 3 modules separately and created a schematic view and config view. I have also declared global power supply in the design. I have verified the decoder separately for its functionality using ideal voltage
I think these should be global as they are constants and they are stored in ROM during compilation. const char* welcomeMsg = "Real time clock is:"; const char* space = " "; const char ascii ={'0','1','2','3','4','5','6','7','8','9'}; I don't know if LPC allows to write to ROM during program run.
Hello all. This is my first VHDL design. I am running two separate ADPLLs, referenced to one reference. The idea is that one ADPLL will generate a sine and cosine signal phase locked to the reference signal at the same frequency and the other PLL will generate waves at twice the frequency. I synthesized the design and run it on Altium Nano
hi, I've a question regarding choosing an oscillator for the Spartan 6 FPGA. So, if someone has experience with it, please share :) My question is: where can I find the information on the maximum allowable oscillator frequency for the FPGA in the datasheets of FPGA? Maybe some references/ information and example on how you choose the oscilla
The part of FPGA is V6-XC6VLX760-1, which has 18 clock regions. That clock drives logic in 9 clock regions, and I don't know whether this is the root cause. And: 1. The number of utilized BUFG is 18, smaller than 32. 2. The number of global clocks in each clock region is smaller than 12. (...)
Actually there are bunch of things which determine the clock tree power a) Low Vt will consume higher power. For high frequency designs low Vt cells should be used for clock tree. global clock tree should be preplanned with the number of buffers/inverters you need to use. Local can be a bit random ( read CTS tool fo
Why do we bother about the global Skew? It doesn't help you in closing the timing, as local-skew does.