Now, that is interesting!
I experienced exactly same thing using an ADuC7129 and an AT91RM9200. Doing it the GPIO way worked fine as long as I went slow, using the external bus worked partly and seldom. I tried different PLL clocks, 48MHz atmost if I remember correctly. The conclusion was the same- the S1D13742F01A2 resetted itself, at least it seemed so. Sometimes some registers were left unchanged after a "reset".
Hence, I did not dare post my schematics and gerbers here, since it didn't work (the constant risk of embarrasment
). I mailed Epson about this - about 3 months ago - and of course no reply. This made me lose the interest of going any further so I went on to other projects.
Would you find another suitable LCD controller, please let us know! I for one would gladly design a new pcb that is actually working.
Oh, anyone interested in some S1D13742F01A2 epson lcd driver parts by any chance - I'll sell them cheap