module zhengxing(clk_200M, rst, data_in, data_out ); input clk_200M; input rst; input data_in; output data_out; reg data_out; reg [2:0]counter; reg [1:0]state; parameter low=2'b00, wait_high=2'b01, high=2'b10, wait_low=2'b11; always @ (posedge clk_200M or posedge rst) if(rst==1) begin counter<=0; data_out<=0; state<=low; end else case(state) low:if(counter>=3) begin data_out<=0; state<=wait_high; end else begin counter<=counter+1; // data_out<=1; state<=low; end wait_high:if(data_in==1) begin state<=high; counter<=0; ///data_out<=0; end else begin state<=wait_high; counter<=0; //data_out<=0; end high:if(counter>=3) begin data_out<=1; state<=wait_low; end else begin state<=high; counter<=counter+1; end wait_low:if(data_in==0) begin state<=low; counter<=0; end else begin state<=wait_low; counter<=0; end default:state<=low; endcase endmodule there is no error in it.and the simulation is also right ,but when it is in the fpga ,it doesn't work.and the out port is always high ; i don't know it's why! who can help me? thank you!

I assume clk_200M is a 200 MHz clock signal. Perhaps this is too fast for the FPGA you are using. Which FPGA and speed grade are you using?

As a start, for debug purposes, remove or comment out all the logic in the process and just tie your outport to 'low' to see if this pin can toggle. ie. data_out <- '0'. Observe this at the FPGA out and if this pin is still staying high then check your drive strengths for that pin in your qsf file.

i change the clk from 200M to 20M,but it also didn't work; my fpga is ep2c5t144c8

this io is well !and i connect the input pin to output pin 'data_out' ,the wave is the same as the input pin, so i don't think the pin has problem!

--- Quote Start --- this io is well !and i connect the input pin to output pin 'data_out' ,the wave is the same as the input pin, so i don't think the pin has problem! --- Quote End --- Hi, I assume that the code represents the whole design ??? If yes, please post your project in the forum. Kind regards Gerd

a strange problem! | Altera Community

19 Replies

Altera_Forum
Honored Contributor
16 years ago
I assume clk_200M is a 200 MHz clock signal. Perhaps this is too fast for the FPGA you are using. Which FPGA and speed grade are you using?
Altera_Forum
Honored Contributor
16 years ago
As a start, for debug purposes, remove or comment out all the logic in the process and just tie your outport to 'low' to see if this pin can toggle.

ie. data_out <- '0'. Observe this at the FPGA out and if this pin is still staying high then check your drive strengths for that pin in your qsf file.
Altera_Forum
Honored Contributor
16 years ago
i change the clk from 200M to 20M,but it also didn't work; my fpga is ep2c5t144c8
Altera_Forum
Honored Contributor
16 years ago
this io is well !and i connect the input pin to output pin 'data_out' ,the wave is the same as the input pin, so i don't think the pin has problem!
Altera_Forum
Honored Contributor
16 years ago
--- Quote Start ---
this io is well !and i connect the input pin to output pin 'data_out' ,the wave is the same as the input pin, so i don't think the pin has problem!
--- Quote End ---

Hi,

I assume that the code represents the whole design ??? If yes, please post your project
in the forum.

Kind regards

Gerd
Altera_Forum
Honored Contributor
16 years ago
--- Quote Start ---
Hi,

I assume that the code represents the whole design ??? If yes, please post your project
in the forum.

Kind regards

Gerd
--- Quote End ---

this module is only use to do with square wave,when the square wave with some unstable signal on its edge input into the input pin ,i want to use this module to get a stable square wave .and after getting the square wave from this module ,i think it can make other module work well.but i find it not work;
the square wave inputting into the input pin is below 10M;
Altera_Forum
Honored Contributor
16 years ago
--- Quote Start ---
this module is only use to do with square wave,when the square wave with some unstable signal on its edge input into the input pin ,i want to use this module to get a stable square wave .and after getting the square wave from this module ,i think it can make other module work well.but i find it not work;
the square wave inputting into the input pin is below 10M;
--- Quote End ---

Hi,

there could be a lot of reasons why your design is not running on the FPGA. It would help when you at least post your <>.qsf in the forum, because then we can check your settings.

Kind regards

Gerd
Altera_Forum
Honored Contributor
16 years ago
--- Quote Start ---
Hi,

there could be a lot of reasons why your design is not running on the FPGA. It would help when you at least post your <>.qsf in the forum, because then we can check your settings.

Kind regards

Gerd
--- Quote End ---

Hi,I'm sorry! and I forget it .
my <>.qsf is

# --------------------------------------------------------------------------# # # Copyright (C) 1991-2009 Altera Corporation# Your use of Altera Corporation's design tools, logic functions # and other software and tools, and its AMPP partner logic # functions, and any output files from any of the foregoing # (including device programming or simulation files), and any # associated documentation or information are expressly subject # to the terms and conditions of the Altera Program License # Subscription Agreement, Altera MegaCore Function License # Agreement, or other applicable license agreement, including, # without limitation, that your use is for the sole purpose of # programming logic devices manufactured by Altera and sold by # Altera or its authorized distributors. Please refer to the # applicable agreement for further details.# # --------------------------------------------------------------------------# # # Quartus II# Version 9.0 Build 132 02/25/2009 SJ Full Version# Date created = 17:02:23 July 13, 2009# # --------------------------------------------------------------------------# # # Notes:# # 1) The default values for assignments are stored in the file:# zhengxing_assignment_defaults.qdf# If this file doesn't exist, see file:# assignment_defaults.qdf# # 2) Altera recommends that you do not modify this file. This# file is updated automatically by the Quartus II software# and any changes you make may be lost or overwritten.# # --------------------------------------------------------------------------#

set_global_assignment -name FAMILY "Cyclone II"
set_global_assignment -name DEVICE EP2C5T144C8
set_global_assignment -name TOP_LEVEL_ENTITY zhengxing
set_global_assignment -name ORIGINAL_QUARTUS_VERSION 9.0
set_global_assignment -name PROJECT_CREATION_TIME_DATE "17:02:23 JULY 13, 2009"
set_global_assignment -name LAST_QUARTUS_VERSION 9.0
set_global_assignment -name USE_GENERATED_PHYSICAL_CONSTRAINTS OFF -section_id eda_blast_fpga
set_global_assignment -name MIN_CORE_JUNCTION_TEMP 0
set_global_assignment -name MAX_CORE_JUNCTION_TEMP 85
set_global_assignment -name VERILOG_FILE zh.v
set_instance_assignment -name PARTITION_HIERARCHY root_partition -to | -section_id Top
set_global_assignment -name PARTITION_NETLIST_TYPE SOURCE -section_id Top
set_global_assignment -name PARTITION_COLOR 16764057 -section_id Top
set_global_assignment -name LL_ROOT_REGION ON -section_id "Root Region"
set_global_assignment -name LL_MEMBER_STATE LOCKED -section_id "Root Region"
set_global_assignment -name MISC_FILE "E:/cheng_xu/zhengxing/zhengxing.dpf"
set_global_assignment -name QIP_FILE pll_0.qip
set_global_assignment -name BDF_FILE zhengxing.bdf
set_global_assignment -name STRATIX_DEVICE_IO_STANDARD "3.3-V LVTTL"
set_location_assignment PIN_17 -to clk
set_location_assignment PIN_51 -to data_in
set_location_assignment PIN_48 -to data_out
set_location_assignment PIN_75 -to rst
set_global_assignment -name RESERVE_ALL_UNUSED_PINS "AS INPUT TRI-STATED"
set_global_assignment -name RESERVE_ALL_UNUSED_PINS_NO_OUTPUT_GND "AS OUTPUT DRIVING AN UNSPECIFIED SIGNAL"
set_global_assignment -name STRATIX_CONFIGURATION_DEVICE EPCS1
set_global_assignment -name RESERVE_ASDO_AFTER_CONFIGURATION "AS INPUT TRI-STATED"
set_global_assignment -name VECTOR_WAVEFORM_FILE zhengxing.vwf
set_global_assignment -name SETUP_HOLD_DETECTION ON
set_global_assignment -name SETUP_HOLD_DETECTION_INPUT_REGISTERS_BIDIR_PINS_DISABLED ON
set_global_assignment -name SIGNALTAP_FILE stp1.stp
set_global_assignment -name ENABLE_SIGNALTAP OFF
set_global_assignment -name USE_SIGNALTAP_FILE stp1.stp

thank you!
Altera_Forum
Honored Contributor
16 years ago
--- Quote Start ---
Hi,I'm sorry! and I forget it .
my <>.qsf is

# --------------------------------------------------------------------------#
#
# Copyright (C) 1991-2009 Altera Corporation
# Your use of Altera Corporation's design tools, logic functions
# and other software and tools, and its AMPP partner logic
# functions, and any output files from any of the foregoing
# (including device programming or simulation files), and any
# associated documentation or information are expressly subject
# to the terms and conditions of the Altera Program License
# Subscription Agreement, Altera MegaCore Function License
# Agreement, or other applicable license agreement, including,
# without limitation, that your use is for the sole purpose of
# programming logic devices manufactured by Altera and sold by
# Altera or its authorized distributors. Please refer to the
# applicable agreement for further details.
#
# --------------------------------------------------------------------------#
#
# Quartus II
# Version 9.0 Build 132 02/25/2009 SJ Full Version
# Date created = 17:02:23 July 13, 2009
#
# --------------------------------------------------------------------------#
#
# Notes:
#
# 1) The default values for assignments are stored in the file:
# zhengxing_assignment_defaults.qdf
# If this file doesn't exist, see file:
# assignment_defaults.qdf
#
# 2) Altera recommends that you do not modify this file. This
# file is updated automatically by the Quartus II software
# and any changes you make may be lost or overwritten.
#
# --------------------------------------------------------------------------#

set_global_assignment -name FAMILY "Cyclone II"
set_global_assignment -name DEVICE EP2C5T144C8
set_global_assignment -name TOP_LEVEL_ENTITY zhengxing
set_global_assignment -name ORIGINAL_QUARTUS_VERSION 9.0
set_global_assignment -name PROJECT_CREATION_TIME_DATE "17:02:23 JULY 13, 2009"
set_global_assignment -name LAST_QUARTUS_VERSION 9.0
set_global_assignment -name USE_GENERATED_PHYSICAL_CONSTRAINTS OFF -section_id eda_blast_fpga
set_global_assignment -name MIN_CORE_JUNCTION_TEMP 0
set_global_assignment -name MAX_CORE_JUNCTION_TEMP 85
set_global_assignment -name VERILOG_FILE zh.v
set_instance_assignment -name PARTITION_HIERARCHY root_partition -to | -section_id Top
set_global_assignment -name PARTITION_NETLIST_TYPE SOURCE -section_id Top
set_global_assignment -name PARTITION_COLOR 16764057 -section_id Top
set_global_assignment -name LL_ROOT_REGION ON -section_id "Root Region"
set_global_assignment -name LL_MEMBER_STATE LOCKED -section_id "Root Region"
set_global_assignment -name MISC_FILE "E:/cheng_xu/zhengxing/zhengxing.dpf"
set_global_assignment -name QIP_FILE pll_0.qip
set_global_assignment -name BDF_FILE zhengxing.bdf
set_global_assignment -name STRATIX_DEVICE_IO_STANDARD "3.3-V LVTTL"
set_location_assignment PIN_17 -to clk
set_location_assignment PIN_51 -to data_in
set_location_assignment PIN_48 -to data_out
set_location_assignment PIN_75 -to rst
set_global_assignment -name RESERVE_ALL_UNUSED_PINS "AS INPUT TRI-STATED"
set_global_assignment -name RESERVE_ALL_UNUSED_PINS_NO_OUTPUT_GND "AS OUTPUT DRIVING AN UNSPECIFIED SIGNAL"
set_global_assignment -name STRATIX_CONFIGURATION_DEVICE EPCS1
set_global_assignment -name RESERVE_ASDO_AFTER_CONFIGURATION "AS INPUT TRI-STATED"
set_global_assignment -name VECTOR_WAVEFORM_FILE zhengxing.vwf
set_global_assignment -name SETUP_HOLD_DETECTION ON
set_global_assignment -name SETUP_HOLD_DETECTION_INPUT_REGISTERS_BIDIR_PINS_DISABLED ON
set_global_assignment -name SIGNALTAP_FILE stp1.stp
set_global_assignment -name ENABLE_SIGNALTAP OFF
set_global_assignment -name USE_SIGNALTAP_FILE stp1.stp

thank you!
--- Quote End ---

Hi,

I did not see your verilog file ( in your first post) in the qsf. Are you using the zhengxing.bdf ? Is your reset signal connected ? Polarity ?

Kind regards

Gerd
Altera_Forum
Honored Contributor
16 years ago
--- Quote Start ---
Hi,

I did not see your verilog file ( in your first post) in the qsf. Are you using the zhengxing.bdf ? Is your reset signal connected ? Polarity ?

Kind regards

Gerd
--- Quote End ---

oh! i've changed the name of the module ,and its name is zh.v ,and use it in zhengxing.bdf

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a strange problem!

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