Re: CF speed is too slow?

Altera_Forum · ‎11-11-2005

Hello.

I'm now trying to use CF with nios2 dev kit(Stratix2).

But the speed of CF is very slow.

I tried this code.

(VFAT format is used.)

   FILE *fp;
   int c;
   if ((fp = fopen("/mnt/ide0/test.txt", "r")) == NULL) { 
        return 0;
   }
   while ((c = getc(fp)) != EOF){
     led->np_piodata = c;  // Blink LED
   }

When I use 220kByte test.txt,

it took 1sec for complete this loop.

I need this speed at lease 15MByte/sec.

Is it possible to improve it?

If it's possible, how can I do it?

Thank you.

Altera_Forum · ‎11-13-2005

This is self-replay.

I found the answer in this forum.

http://www.niosforum.com/forum/index.php?s...5&hl=throughput (http://www.niosforum.com/forum/index.php?showtopic=1155&hl=throughput)

Altera_Forum · ‎11-24-2005

Please check the PTF file, for CFI.

The read/write wait timing is too slow.

You should change it to mode2 (about 200ns) or mode4.

SLAVE ide

{

# The timing parameters below ensure proper operation with "Mode 0"

# Compact Flash devices (the slowest speed), in True IDE mode. If

# a different mode is used, these timing settings may be adjuste for

# higher performance.

SYSTEM_BUILDER_INFO

{

Bus_Type = "avalon";

Address_Alignment = "native";

Address_Width = "4";

Data_Width = "16";

Has_IRQ = "1";

Read_Wait_States = "530ns";

Write_Wait_States = "500ns";

Setup_Time = "70ns";

Hold_Time = "30ns";

--- Quote Start ---

originally posted by m_isshiki@Nov 11 2005, 10:52 AM

hello.

i'm now trying to use cf with nios2 dev kit(stratix2).

but the speed of cf is very slow.

i tried this code.

(vfat format is used.)

file *fp; int c; if ((fp = fopen("/mnt/ide0/test.txt", "r")) == null) { return 0; } while ((c = getc(fp)) != eof){ led->np_piodata = c; // blink led }

when i use 220kbyte test.txt,

it took 1sec for complete this loop.

i need this speed at lease 15mbyte/sec.

is it possible to improve it?

if it's possible, how can i do it?

thank you.

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=10918)</div>

--- Quote End ---