網路上查到的.參考一下: $ H& K0 H" y8 I0 R$ x"Diffusion ROM is based on VT change (using VT implant mask) => Hihg VT transistors not conducting, low VT ones conducting 7 `" U* g7 B- {5 V' k: @
VIA ROM is using via to "connect" or "not connect", resulting 0 and 1 3 j; _% }. P0 o% b. |
VIA ROM may have bigger cell size "