6502/visual6502
1
0
Fork 0
mirror of https://github.com/trebonian/visual6502.git synced 2025-01-02 06:29:41 +00:00
Code Issues Projects Releases Wiki Activity

Z80: override chipsim getNodeValue() to better model charge sharing

Browse Source
This commit is contained in:
David Banks 2018-10-08 10:29:55 +01:00
parent 5005774b1b
commit f360557572
1 changed files with 31 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
chip-z80/support.js
View File

@ -24,6 +24,37 @@ presetLogLists=[
['_int','_nmi', nodenamereset],
];
// Override ChipSim getNodeValue() function to allow an estimate of capacitance
// (number of connections) to be used when joining floating segments.
function getNodeValue(){
// 1. deal with power connections first
if(arrayContains(group, ngnd)) return false;
if(arrayContains(group, npwr)) return true;
// 2. deal with pullup/pulldowns next
for(var i in group){
var nn = group[i];
var n = nodes[nn];
if(n.pullup) return true;
if(n.pulldown) return false;
}
// 3. resolve connected set of floating nodes
// based on state of largest (by #connections) node
// (previously this was any node with state true wins)
var max_state = false;
var max_connections = 0;
for(var i in group){
var nn = group[i];
var n = nodes[nn];
var connections = n.gates.length + n.c1c2s.length;
if (connections > max_connections) {
max_connections = connections;
max_state = n.state;
}
}
return max_state;
}
function setupTransistors(){
for(i in transdefs){
var tdef = transdefs[i];