logika ras a cas i s refresem (CAS before RAS) neni az tak kriticka uz jsem si
ji kdysi psal
RAS <= '0' when MREQ='0' and RFSH='1' else --normalni ras
'0' when MREQ='0' and RFSH='0' and CLK='1' else --refresh
'1';
CAS <= '0' when OLDCAS='0' else --normalni cas
'0' when MREQ='0' and RFSH='0' else
--refresh
'1';
(DL)