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Fix timing of dice compatibility capacitor delay. (nw)

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This commit is contained in:
couriersud 2015-05-09 14:42:05 +02:00
parent 8720d303c3
commit 226bedbb6a
2 changed files with 21 additions and 5 deletions
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1
src/emu/netlist/devices/nld_legacy.c
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@ -66,6 +66,7 @@ NETLIB_UPDATE(nicDelay)
}
else if (!INPLOGIC(m_I) && m_last)
{
// H_to_L
OUTLOGIC(m_Q, 0, NLTIME_FROM_NS(m_H_to_L.Value()));
}
m_last = INPLOGIC(m_I);

25
src/emu/netlist/nl_dice_compat.h
View File

@ -155,16 +155,31 @@ public:
* This is a transitional implementation
*/
inline int CAPACITOR_tc(const double c, const double r)
inline int CAPACITOR_tc_hl(const double c, const double r)
{
static const double TIME_CONSTANT = -log((3.4 - 2.0) / 3.4);
int ret = (int) (TIME_CONSTANT * (130.0 + r) * c * 1e9 * 0.1); // 0.1 avoids bricks with shadow
/*
* Vt = (VH-VL)*exp(-t/RC)
* ln(Vt/(VH-VL))*RC = -t
*/
static const double TIME_CONSTANT = -log(2.0 / (3.7-0.3));
int ret = (int) (TIME_CONSTANT * (130.0 + r) * c * 1e9);
return ret;
}
inline int CAPACITOR_tc_lh(const double c, const double r)
{
/*
* Vt = (VH-VL)*(1-exp(-t/RC))
* -t=ln(1-Vt/(VH-VL))*RC
*/
static const double TIME_CONSTANT = -log(1.0 - 0.8 / (3.7-0.3));
int ret = (int) (TIME_CONSTANT * (1.0 + r) * c * 1e9);
return ret;
}
#define CHIP_CAPACITOR(_name, _pdesc) \
NETDEV_DELAY(_name) \
NETDEV_PARAMI(_name, L_TO_H, CAPACITOR_tc((_pdesc)->c, (_pdesc)->r)) \
NETDEV_PARAMI(_name, H_TO_HL, CAPACITOR_tc((_pdesc)->c, (_pdesc)->r))
NETDEV_PARAMI(_name, L_TO_H, CAPACITOR_tc_lh((_pdesc)->c, (_pdesc)->r)) \
NETDEV_PARAMI(_name, H_TO_L, CAPACITOR_tc_hl((_pdesc)->c, (_pdesc)->r))
#endif /* NL_DICE_COMPAT_H_ */