本公眾號【讀芯樹:duxinshu_PD】主要介紹數(shù)字集成電路物理設(shè)計(jì)相關(guān)知識,才疏學(xué)淺,如有錯(cuò)誤,歡迎指正交流學(xué)習(xí)。
這是集成電路物理設(shè)計(jì)的第一個(gè)系列【physical cell】的第一篇文章,也是本公眾號的第一篇文章,從boundary cell說起:
1,什么是boundary cell?
2,為什么需要insert boundary cell? 在芯片制造的過程中,最邊界的standard cell最容易受到損傷,為減少standard cell的制造過程中的損傷,需要在邊界放置boundary cell,boundary cell有dummy poly gate,當(dāng)制造過程中的損傷發(fā)生在邊界時(shí),boundary cell的損傷不會影響正常standard cell的功能。 如果沒有在邊界放置boundary cell, 可能會對芯片的功能造成不可逆的損傷。 在well和implant 層之間不能有g(shù)ap,否則會有drc,boundary cell保證了well和implant 層之間沒有g(shù)ap。 boundary cell的poly extension保證了standard cell的source/drain不會出現(xiàn)在邊界。 boundary cell放置在row的邊界同時(shí)保證了邊界的well tie的需求。
3,boundary cell的layout是什么樣的?
boundary cell沒有l(wèi)ogic pin,只有VDD/GND的連接; boundary cell在最左或者右側(cè)擴(kuò)展NWELL來減小well proximity effects (WPE 見5)。 boundary cell有dummy poly用于保護(hù)standard cell 的gate。 boundary cell的poly layer會被切斷 (Poly Cut layer)
4,如何在floor plan階段insert boundary cell?
>set_boundary_cell_rules \ -top_boundary_cells 'BOUNDARYPROW* \ -bottom_boundary_cells 'BOUNDARYPROW* \ -left_boundary_cell 'BOUNDARYLEFT*' \ -right_boundary_cell 'BOUNDARYRIGHT*' \ -top_right_outside_corner_cell 'BOUNDARYPCORNE*' \ -bottom_right_outside_corner_cell 'BOUNDARYPCORNER*' \ -top_left_outside_corner_cell 'BOUNDARYPCORNER*' \ -bottom_left_outside_corner_cell 'BOUNDARYPCORNER*' \ -top_right_inside_corner_cells 'BOUNDARYPINCORNER*' \ -bottom_right_inside_corner_cells 'BOUNDARYPINCORNER*' \ -top_left_inside_corner_cells 'BOUNDARYPINCORNER* \ -bottom_left_inside_corner_cells 'BOUNDARYPINCORNER*' \ -top_left_inside_horizontal_abutment_cells 'BOUNDARYPROWLGAP*' \ -bottom_left_inside_horizontal_abutment_cells 'BOUNDARYPROWLGAP*' \ -top_right_inside_horizontal_abutment_cells 'BOUNDARYPROWRGAP*' \ -bottom_right_inside_horizontal_abutment_cells 'BOUNDARYPROWRGAP*'\ -mirror_left_inside_corner_cell \ -mirror_left_outside_corner_cell \ -segment_parity {horizontal_odd vertical_even} \ -min_vertical_jog 0.042 \ -min_horizontal_jog 0.612 \ -min_vertical_jog 0.042 \ -min_horizontal_jog 0.612 \ -min_vertical_separation 0.21 \ -min_horizontal_separation 2.397-rightEdge BOUNDARYLEFT* \ -leftEdge BOUNDARYRIGHT*\ -leftTopCorner BOUNDARYPCORNER*\ -leftBottomCorner BOUNDARYPCORNER* \ -rightTopCorner BOUNDARYPCORNER*\ -rightBottomCorner BOUNDARYPCORNER* \ -topEdge {BOUNDARYPROW8* BOUNDARYPROW4*BOUNDARYPROW2* BOUNDARYPROW1*}-bottomEdge {BOUNDARYPROW8* BOUNDARYPROW4* BOUNDARYPROW2* BOUNDARYPROW1*} \-rightTopEdge BOUNDARYPINCORNER* \ -rightBottomEdge BOUNDARYPINCORNER* \ -leftTopEdge BOUNDARYPINCORNER* \ -leftBottomEdge BOUNDARYPINCORNER* \ -rightTopEdgeNeighbor BOUNDARYPROWRGAP*\ -rightBottomEdgeNeighbor BOUNDARYPROWRGAP*\ -leftTopEdgeNeighbor BOUNDARYPROWLGAP*\ -leftBottomEdgeNeighbor BOUNDARYPROWLGAP*\ >addEndCap >verifyEndCap -report endcap.rpt 5, 什么是阱臨近效應(yīng)(WPE: Well Proximity Effect) 6,參考文獻(xiàn)
1,F(xiàn)usion Compiler/ IC Compiler user guide
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