Here's the issue with eagle autorouter and me trying to connect a 62256 ram chip to a 74HC574 latch (even with clock and latch enable disconnected)
I measured the width in the trouble IC (74HC574) and its 6 mm. I went paranoid and decided to allow eagle to use 0.1mm track width and 0.1mm track spacing. I used 0.3mm spacing between pad and anything else next to it. I set the restring (of the pads) to 0.24mm and to make the pads small and circular instead of oval, I set Elongation to 0 instead of 100.
In the miscellaneous section, I unchecked "check grid", "check angle", "check font" and "check restrict".
I think I did very good so far.
So here's my math if I used 0.1mm track width and 0.1mm track space:
0.3mm initial spacing from end of pad = 0.3mm +0.1mm 1st track width = 0.4mm +0.1mm 1st space = 0.5mm +0.1mm 2nd track width = 0.6mm +0.1mm 2nd space = 0.7mm +0.1mm 3rd track width = 0.8mm +0.1mm 3rd space = 0.9mm +0.1mm 4th track width = 1mm +0.1mm 4th space = 1.1mm +0.1mm 5th track width = 1.2mm +0.1mm 5th space = 1.3mm +0.1mm 6th track width = 1.4mm +0.1mm 6th space = 1.5mm +0.1mm 7th track width = 1.6mm +0.1mm 7th space = 1.7mm +0.1mm 7th track width = 1.8mm +0.1mm 7th space = 1.9mm +0.1mm 8th track width = 2mm +0.3mm space to next pad = 2.3mm
and even if I doubled the track width, I'd still have space.
I also tried changing all cost settings under the Route tab in autorouter to "0" except I left the polygon setting alone and I even set the autorouting grid to 0.2mm.
Here's part of the pcb completely unrouted
Here's how I hand-routed the board but it took me 10 minutes and I don't want to spend 10 minutes per complete routing attempt.
This is how eagle routes it:
It didn't finish.
In every auto-routing attempt I made, there was not one time that eagle would start a track horizontally from an IC pin (such as what I did with my ground pin of the 74HC574), and this is even after I set the preferred track direction to horizontal.
How do I configure eagle to auto-route these tracks properly (or at least how do I configure eagle to make tracks run horizontally out of the ground and VCC pins of digital IC's)?