ms_ck.c
1.53 KB
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/**************************************************************************
* *
* Copyright (C) 1993, 1994, 1995 Silicon Graphics, Inc. *
* *
* These coded instructions, statements, and computer programs contain *
* unpublished proprietary information of Silicon Graphics, Inc., and *
* are protected by Federal copyright law. They may not be disclosed *
* to third parties or copied or duplicated in any form, in whole or *
* in part, without the prior written consent of Silicon Graphics, Inc. *
* *
**************************************************************************/
/*
* ms_ck.c: clock driver module for rdp regression (allows top level 'C'
* to randomly stall the gclock by de-asserting gclock_enable).
*/
#include "ms_ck.h"
void
ms_ck(ms_ck_t **pp0, ms_ck_t **pp1)
{
int i;
ms_ck_t *p0, *p1;
p0 = *pp0;
p1 = *pp1;
p1->time = p1->time + 1;
if( ( p1->time % ( p1->t0 + p1->t1 ) ) < p1->t0 ) {
p0->clock = 1;
} else {
p0->clock = 0;
}
/*
* C sim is stalling gclock randomly with the gclock_enable signal.
*
* gclock is equal to the clock when it's enabled; otherwise, it holds
* its previous value.
*/
if (p0->gclock_enable) {
p0->gclock = p0->clock;
} else {
p0->gclock = p1->gclock;
}
}
void
ms_ck_init(ms_ck_t *p0, ms_ck_t *p1)
{
int i;
p0->clock = p1->clock = 1;
p0->gclock = p1->gclock = 1;
p0->t0 = p1->t0 = 1;
p0->t1 = p1->t1 = 1;
p1->time = p0->time = 0;
}