Do MOSIS design rules permit features drawn at a 45-degree angle (non-Manhattan features)?
It’s best to avoid non-Manhattan layout. If a design requirement demands a violation of this rule, make sure that non-orthogonal features are very large, never approaching minimum width, spacing, or overlap. Contacts and vias must be orthogonal. For additional information, please see the MOSIS technical note, “Mask Data Prep and Manhattan Layout”. 6.0 How can I convert an SCMOS design from SCN4M_SUBM (TSMC 0.35 micron) to SCN5M_SUBM (TSMC 0.25 micron)? For single-poly TSMC 0.35 micron designs, lambda must be redefined from 0.2 (for TSMC 0.35) to 0.15 (for TSMC 0.25). Pads should not be directly scaled, so the pad ring may need special attention. This includes adding via4 and metal5 to the TSMC 0.25 pad stacks. Note that TSMC 0.25 might permit smaller lambda values for Rule 22 (metal4) than the original TSMC 0.35 design. TSMC 0.35 Poly2-Poly1 capacitors should be converted to TSMC_025 M4_Prime-M4 capacitors. 7.0 What are the requirements for metal fill for CMP (chemical mechanical polis
