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Re: Comm (SPI & Ethernet modules) not working after migration from ISE -> Vivado.
Sorry for late update. The problem is sorted. Some how SCLK bumped above maximum threshold (i.e. 72nS). Tweaked the clock and now Ethernet is working.
Thank you all for your help and suggestions.
Hi all,
I am in the process of migrating our firmware from ISE to Vivado. Initially there were couple of synthesis errors which are now fixed and i was able to generate .bit/.bin files and successfully programmed Cmod A7 module to test Ethernet communication between PC and our system. We used...
@TrickyDicky & @FvM:
I rewrite the function and it works. Amended function is given below:
function conv_ascii_to_binary(value: std_logic_vector(23 downto 0)) return std_logic_vector is
variable byte0 : std_logic_vector(7 downto 0);
variable byte1 : std_logic_vector(7 downto 0)...
I have started to migrate our firmwares from ISE to Vivado (reason is upgrading from spartan3 to Artix7). While migrating first firmware i initially came across 4 errors after i run synthesis. which are as follow
1. [Synth 8-248] direction of slice does not match direction of prefix...
I am developing a resistivity meter based upon wenner array. Used LMP7721 in transimpedence configuration to measure low current. (https://www.ti.com/lit/ug/snou004/snou004.pdf). See if it is of any help.
Hi all,
I want to measure ultra low current (couple of nano ampere). Is there any special technique to measure such low currents or differntial voltage measurement across a series resistor (Rsense) will do ?
Suggestions to select appropriate operational amplifier for low current measurment...
Thank you to reply Klaus. Rest of the wires are supplies, ground and TTL signals. The signals i want to transmit are data and permanent clock. Cable is unshielded. Signals at source are 5V. Available supplies are 5V & +12V with common ground. i can up level the signal to 12V and then down level...
Thanks Brain to reply. Indeed it is a poorly planned setup. RC circuit on output of Schmitt trigger ? As per my understanding, series RC circuit will add delay. I am not able to see throughput of schmitt triggers on data sheets.
Further details about series RC circuit would highly be...
I mean to say that i already have 12 way cable and no wire is spare and can not be replaced by cable with more interconnections. Hence, if i use RS485, more wires are required to transmit differential signals which is not possible at the moment. Therefore, solution should be single ended...
Hi KlausST,
Thank you for your suggestion. For RS-485 i need two wires to transmit each signal between the boards. Interconnect cable is already 12 way and has 12 way molex connectors on both ends. Space on both boards is limited.
I can not change the cable/connector. Under these circumstances...
Hi all,
I have a 2MHz/5V signal. I want to shift its level at 12V then transmit it over a wire (70cm long) to another board. On the other end i would like to shift level of 12V signal back to 5V. I tried CD4504B. But the signal get distorted ..... and duty cycle changed to 60% from 50%...
Hi SunnySkyguy,
Thanks again for your response. I want to implement your idea to supply low freq. square wave (AC) to rock sample. Things are getting better with resistivity meter. I don’t understand this bit "I would consider a low frequency Square wave current source and measure the response...
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