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im now encounter a problem with EPM240 high impedance output,it seems like the io port has connected a low value R to the ground that drop down the voltage provided by other signal on the bus.
The circut is very simple.
and the verilog code is:
assign aup=adjlevel?1'b0:1'bz;
assign...
I Need ur help plz.
case stat1=>
if clkcnt<DelayConst then
clkcnt<=clkcnt+1;
else
state<=stat2;
clkcnt<=(others<='0');
(other opcode......)
end if;
case stat2=>
isplever warning - ngdbuild: logical net
－－－－－－－－－－－－－－－－－－－－－－－－－
im very sorry for that basic error i've made!
I just dont wanna mislead other people,so delete the file!
thanks for you concern!
I have to learn more...........................
Oh,My god.whats happenning?
isplever logocal net has no load
The attachment is a test vhdl code project.Its very simple,but it has serious waring under isplever 7.0! I dont know how it generated, so you can compile under ise or
quartus to check out the reason.
I just wonder is it from VHDL code problem or the...
Im now learning VHDL,but i encounter an embarrassed problem: i cant simulate this simple VHDL code with modelsim6.0 properly.Please help me out,thanks.
VHDL CODE:
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_unsigned.all;
USE ieee.std_logic_arith.all;
entity frediv is
port(...
ue6005
i have no idea about RTC IC such as ue6005 or T4227 and the interface with 51MCU! but i have to finish this project as soon as posible!anyone can help me? pose a diagram or schematic or C51program for example................
----thanks
at89s8253 spi
thanks silvio!
1: the high four bits in one byte are always "1" thats 0xfx( hex)
2:i have readed these kind of PDF file a thousand times! i have no idea about the relation between the SPI operation and P1=0xff?
can you explaint?(check the attachment ) thanks,:|
at89s8253 edaboard
check this c51 code example:
why the *ptr pointer parameter point to ROM data ,it work correctly!(no need to let:P0=0xff)
but it work incorrectly when pointer point to external RAM?(Penomena:always missing the high four bits in one byte),but if adding that clause:P0=0xff,it...
in digital circuit,we can find many pullup or pulldown Resistors in output our input port!but how to select that kind of resistors in our own circuit?anyone can help!i really have no idea about that!thanks!
:|:|:|:|
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