OCuLink Riser for the Supermicro AIOM Slot

@@ -1,33 +0,0 @@-#!/usr/bin/env python3-"""Delay of each differential pair: trace length per layer times sqrt(eeff_odd)/c, plus via barrels."""-import json, math, os-HERE = os.path.dirname(__file__)-Z = json.load(open(os.path.join(HERE, "..", "design", "zfinal.json")))-C_MM_PS = 0.299792458   # mm per ps-EEFF = {"L1": Z["L1"]["eeff_odd"], "L6": Z["L1"]["eeff_odd"], "L3": Z["L3"]["eeff_odd"], "L5": Z["L5"]["eeff_odd"]}-# JLC06161H-3313 z of each signal layer (mm from the top surface)-ZL = {"L1": 0.0, "L3": 0.035 + 0.0994 + 0.0152 + 0.55 + 0.0152, "L5": None, "L6": 1.6}-ZL["L5"] = ZL["L3"] + 0.1088 + 0.0152 + 0.55 + 0.0152-ER_VIA = 4.4   # barrel delay approximated through the laminate---def pair_delay(p):-    """ps for the n trace (equal to p: intra-pair skew is zero by construction)."""-    t = 0.0-    for (lay, net, x1, y1, x2, y2, w) in p.tracks:-        if net == p.nnet:-            t += math.hypot(x2 - x1, y2 - y1) * math.sqrt(EEFF[lay]) / C_MM_PS-    # via barrels along the signal path-    layers = []-    for nd in p.nodes:-        if not layers or layers[-1] != nd[2]:-            layers.append(nd[2])-    for a, b in zip(layers, layers[1:]):-        t += abs(ZL[a] - ZL[b]) * math.sqrt(ER_VIA) / C_MM_PS-    if p.end is not None and p.end[3]:    # via-in-pad up to the L1 pad-        t += ZL[p.end[2]] * math.sqrt(ER_VIA) / C_MM_PS-    return t---def per_mm(layer):-    return math.sqrt(EEFF[layer]) / C_MM_PS