URL
https://opencores.org/ocsvn/versatile_library/versatile_library/trunk
Subversion Repositories versatile_library
[/] [versatile_library/] [trunk/] [misc/] [VersatileCounter.class.php] - Rev 86
Go to most recent revision | Compare with Previous | Blame | View Log
<?php
class VersatileCounter {
static $masks = array(
2 => 0x3,
3 => 0x6,
4 => 0xC,
5 => 0x14,
6 => 0x30,
7 => 0x60,
8 => 0xB8,
9 => 0x110,
10 => 0x240,
11 => 0x500,
12 => 0x829,
13 => 0x100C,
14 => 0x2015,
15 => 0x6000,
16 => 0xD008,
17 => 0x12000,
18 => 0x20400,
19 => 0x40023,
20 => 0x90000,
21 => 0x140000,
22 => 0x300000,
23 => 0x420000,
24 => 0xE10000,
25 => 0x1200000,
26 => 0x2000023,
27 => 0x4000013,
28 => 0xC800000,
29 => 0x14000000,
30 => 0x20000029,
31 => 0x48000000,
32 => 0x80200003
);
private $length, $mask;
private $state = 0;
function __construct($length = 8) {
$this->length = $length;
$this->mask = self::$masks[$length];
}
function state() {
return sprintf("%0" . $this->length . "b",$this->state);
}
function tick() {
$ns = ($this->state * 2) & (pow(2,$this->length) - 1);
$new = $this->state & pow(2,$this->length - 1);
for($i = $this->length - 2;$i >= 0;$i--) {
if($this->mask & pow(2,$i)) {
$new = (int) ($new xor ($this->state & pow(2,$i)));
}
}
if($new == 0) {
$ns++;
}
$this->state = $ns;
}
function run($ticks,$output = false) {
if($output) {
printf("%" . strlen($ticks) . "u: %0" . $this->length . "b\n",0,$this->state);
}
for($i=0;$i<$ticks;$i++) {
$this->tick();
if($output) {
printf("%" . strlen($ticks) . "u: %0" . $this->length . "b\n",$i+1,$this->state);
}
}
}
static function GetState($length,$ticks) {
$VC = new self($length);
$VC->run($ticks);
return $VC->state;
}
}
Go to most recent revision | Compare with Previous | Blame | View Log