PD Lec 20- Macro Channel Spacing Estimation & Floor-planning [part-6] | VLSI | Physical Design

[@jays3590]

Different metal layers will have different pitch values....Which one to consider ??

[@EEBGURRAMVENKATATARUNKUMAR]

How did we get the min distace formula btw the marcos?

[@JagatK_]

Here you have mentioned the horizontal spacing between the macros. Are there any rules or formulas used to find out the vertical spacing between them as well ? And if possible could you please mention the logical reason behind the development of this formula to calculate spacing between the macros ?

[@JagatK_]

@@VLSIAcademyhub Got it. Thanks.

[@naveengadiparthi7544]

which metal layer width you are taking & how can we specify the distance b/w 2 metal layers?

[@EngineerVijitaaDas]

Each metal layer can have different width... which metal layer width to consider?

[@VLSIAcademyhub]

Depends on what is your requirement you can choose any metal layer. For power routing generally the top two metal leaders chosen and for clock routing generally next 3-4 layers are chosen

[@premsagar-gj8pw]

We take pitch value of higher or lower metal layer and why?

[@nikitavarfolomeev6732]

Is channel length the distance between the 2 macros or the width of one macro?

[@VLSIAcademyhub]

Distance between 2 macros

[@nikitavarfolomeev6732]

Why do we use 360 pins in the calculation? Wouldn't the 110 pins of one micro connect to 250 pins of another micro, leading to 250 traces instead of 360?

[@VLSIAcademyhub]

No it's the sum of the two

[@nitismanmishra550]

Hi, Is the formula like for each macro and std cell atleast 1 vdd and 1 gnd is required, so effective pins become 110+250+2, so channel length = 0.1*362/3 ~ 12.1 extimated to be 13um? Can you please reply

[@niyazuddin6443]

If the metal layers are odd numbers thwn how can we calculate that effective routing layers u said no if its even 6/2=3 what if its in our design if it has 7 metal layers how can we do that

[@VLSIAcademyhub]

It's done the same way as earlier, and considered as lower value. In your example it becomes 3 (lower value of 3.5)

[@ANUSHA-hl8nt]

How to fix the macros pls mention it's command?

[@ANUSHA-hl8nt]

@@VLSIAcademyhub Thank you so much for your response

[@darshanbp7054]

Icc2 commonds for spacing of macros..?

[@sridharkommineni6330]

No.of pins × pitch / Total no.of available metal layers