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[/] [spacewire_light/] [trunk/] [doc/] [timing_diagram.py] - Blame information for rev 12

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1 3 jorisvr
#!/usr/bin/env python
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# timing_diagram.py, Joris van Rantwijk, Jul 2010.
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"""
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Generate timing diagrams for SpaceWire Light manual.
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"""
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from pyx import *
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riseWidth = 0.15
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clockWidth = 1.0
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lowLevel = 0
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highLevel = 0.5
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midLevel = 0.25
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def drawGrid(x, y1, y2, tstart, nclk):
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    for i in xrange(nclk):
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        x0 = x + clockWidth * (tstart + i)
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        c.stroke(path.line(x0, y1, x0, y2), [ style.linewidth.Thin, color.gray(0.5) ])
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def drawSignal(x, y, events):
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    for i in xrange(len(events)-1):
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        (t, v) = events[i]
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        (tnext, vnext) = events[i+1]
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        firstevt = (i == 0)
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        lastevt  = (i == len(events) - 2)
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        x0 = x + clockWidth * t
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        x1 = x + clockWidth * t + 0.5 * riseWidth
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        x2 = x + clockWidth * tnext - 0.5 * riseWidth
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        x3 = x + clockWidth * tnext
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        # fill
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        if v.lower() == 'x':
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            p = path.path(path.moveto(x1, y + lowLevel))
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            if not firstevt:
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                p.append(path.lineto(x0, y + midLevel))
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            p.append(path.lineto(x1, y + highLevel))
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            p.append(path.lineto(x2, y + highLevel))
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            if not lastevt:
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                p.append(path.lineto(x3, y + midLevel))
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            p.append(path.lineto(x2, y + lowLevel))
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            p.append(path.lineto(x1, y + lowLevel))
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            c.fill(p, [ color.gray(0.5) ])
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        lineStyle = [ ]
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        if v.lower() != 'x':
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            lineStyle.append(style.linewidth.Thick)
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        # draw low part of signal
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        if v.lower() in '0vx':
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            p = path.path()
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            if firstevt:
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                p.append(path.moveto(x1, y + lowLevel))
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            else:
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                p.append(path.moveto(x0, y + midLevel))
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                p.append(path.lineto(x1, y + lowLevel))
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            p.append(path.lineto(x2, y + lowLevel))
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            if not lastevt:
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                p.append(path.lineto(x3, y + midLevel))
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            c.stroke(p, lineStyle)
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        # draw high part of signal
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        if v.lower() in '1vx':
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            p = path.path()
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            if firstevt:
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                p.append(path.moveto(x1, y + highLevel))
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            else:
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                p.append(path.moveto(x0, y + midLevel))
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                p.append(path.lineto(x1, y + highLevel))
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            p.append(path.lineto(x2, y + highLevel))
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            if not lastevt:
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                p.append(path.lineto(x3, y + midLevel))
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            c.stroke(p, lineStyle)
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        # draw center part of signal
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        if v.lower() == 'z':
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            p = path.path()
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            if firstevt:
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                p.append(path.moveto(x1, y + midLevel))
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            else:
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                p.append(path.moveto(x0, y + midLevel))
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            if lastevt:
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                p.append(path.lineto(x2, y + midLevel))
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            else:
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                p.append(path.lineto(x3, y + midLevel))
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            c.stroke(p, lineStyle)
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th = 0.3 # an appearance of "hold time" in diagram
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xstart = 1.2
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text.set(mode='latex')
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#### Read timing
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c = canvas.canvas()
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drawGrid(xstart, 0.9, 5.5, 1, 9)
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c.text(0, 5, '\\textsf{\\textbf{CLK}}')
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drawSignal(xstart, 5,
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  [ (0.5+i/2.0, str(i%2)) for i in range(20) ])
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c.text(0, 4, '\\textsf{\\textbf{RXVALID}}')
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drawSignal(xstart, 4,
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  [ (0.5, '0'), (2+th, '1'), (7+th, '0'), (10, '') ])
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c.text(0, 3, '\\textsf{\\textbf{RXFLAG}}')
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drawSignal(xstart, 3,
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  [ (0.5, 'x'), (2+th, 'v'), (4+th, 'v'), (6+th, 'v'), (7+th, 'x'), (10, '') ])
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c.text(0, 2, '\\textsf{\\textbf{RXDATA}}')
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drawSignal(xstart, 2,
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  [ (0.5, 'x'), (2+th, 'v'), (4+th, 'v'), (6+th, 'v'), (7+th, 'x'), (10, '') ])
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c.text(0, 1, '\\textsf{\\textbf{RXREAD}}')
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drawSignal(xstart, 1,
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  [ (0.5, '0'), (3+th, '1'), (4+th, '0'), (5+th, '1'), (8+th, '0'), (10, '') ])
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c.stroke(path.line(xstart+4*clockWidth, 0.4, xstart+4*clockWidth, 0.8), [ deco.arrow() ])
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c.stroke(path.line(xstart+6*clockWidth, 0.4, xstart+6*clockWidth, 0.8), [ deco.arrow() ])
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c.stroke(path.line(xstart+7*clockWidth, 0.4, xstart+7*clockWidth, 0.8), [ deco.arrow() ])
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c.writeEPSfile('timing_read.eps')
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#### Write timing
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c = canvas.canvas()
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drawGrid(xstart, 0.9, 5.5, 1, 9)
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c.text(0, 5, '\\textsf{\\textbf{CLK}}')
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drawSignal(xstart, 5,
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  [ (0.5+i/2.0, str(i%2)) for i in range(20) ])
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c.text(0, 4, '\\textsf{\\textbf{TXRDY}}')
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drawSignal(xstart, 4,
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  [ (0.5, '1'), (5+th, '0'), (6+th, '1'), (9+th, '0'), (10, '') ])
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c.text(0, 3, '\\textsf{\\textbf{TXWRITE}}')
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drawSignal(xstart, 3,
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  [ (0.5, '0'), (2+th, '1'), (3+th, '0'), (4+th, '1'), (8+th, '0'), (10, '') ])
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c.text(0, 2, '\\textsf{\\textbf{TXFLAG}}')
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drawSignal(xstart, 2,
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  [ (0.5, 'x'), (2+th, 'v'), (3+th, 'x'), (4+th, 'v'), (5+th, 'v'),
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    (7+th, 'v'), (8+th, 'x'), (10, '') ])
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c.text(0, 1, '\\textsf{\\textbf{TXDATA}}')
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drawSignal(xstart, 1,
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  [ (0.5, 'x'), (2+th, 'v'), (3+th, 'x'), (4+th, 'v'), (5+th, 'v'),
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    (7+th, 'v'), (8+th, 'x'), (10, '') ])
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c.stroke(path.line(xstart+3*clockWidth, 0.4, xstart+3*clockWidth, 0.8), [ deco.arrow() ])
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c.stroke(path.line(xstart+5*clockWidth, 0.4, xstart+5*clockWidth, 0.8), [ deco.arrow() ])
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c.stroke(path.line(xstart+7*clockWidth, 0.4, xstart+7*clockWidth, 0.8), [ deco.arrow() ])
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c.stroke(path.line(xstart+8*clockWidth, 0.4, xstart+8*clockWidth, 0.8), [ deco.arrow() ])
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c.writeEPSfile('timing_write.eps')
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#### Time codes
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c = canvas.canvas()
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xstart = 1.4
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drawGrid(xstart, 0, 6.5, 1, 9)
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c.text(0, 6, '\\textsf{\\textbf{CLK}}')
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drawSignal(xstart, 6,
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  [ (0.5+i/2.0, str(i%2)) for i in range(20) ])
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c.text(0, 5, '\\textsf{\\textbf{TICK\_OUT}}')
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drawSignal(xstart, 5,
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  [ (0.5, '0'), (2+th, '1'), (3+th, '0'), (5+th, '1'), (6+th, '0'), (10, '') ])
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c.text(0, 4, '\\textsf{\\textbf{CTRL\_OUT}}')
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drawSignal(xstart, 4, [ (0.5, 'x'), (2+th, 'v'), (5+th, 'v'), (10, '') ])
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c.text(0, 3, '\\textsf{\\textbf{TIME\_OUT}}')
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drawSignal(xstart, 3, [ (0.5, 'x'), (2+th, 'v'), (5+th, 'v'), (10, '') ])
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c.text(0, 2, '\\textsf{\\textbf{TICK\_IN}}')
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drawSignal(xstart, 2, [ (0.5, '0'), (7+th, '1'), (8+th, '0'), (10, '') ])
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c.text(0, 1, '\\textsf{\\textbf{CTRL\_IN}}')
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drawSignal(xstart, 1, [ (0.5, 'x'), (7+th, 'v'), (8+th, 'x'), (10, '') ])
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c.text(0, 0, '\\textsf{\\textbf{TIME\_IN}}')
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drawSignal(xstart, 0, [ (0.5, 'x'), (7+th, 'v'), (8+th, 'x'), (10, '') ])
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c.writeEPSfile('timing_timecode.eps')
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#### Link status
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c = canvas.canvas()
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clockWidth = 0.8
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xstart = 1.6
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c.text(0, 5, '\\textsf{\\textbf{LINKSTART}}')
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drawSignal(xstart, 5, [ (1, '0'), (2, '1'), (10, '0'), (19, '') ])
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c.text(0, 4, '\\textsf{\\textbf{STARTED}}')
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drawSignal(xstart, 4, [ (1, '0'), (4, '1'), (6, '0'), (19, '') ])
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c.text(0, 3, '\\textsf{\\textbf{CONNECTING}}')
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drawSignal(xstart, 3, [ (1, '0'), (6, '1'), (8, '0'), (19, '') ])
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c.text(0, 2, '\\textsf{\\textbf{RUNNING}}')
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drawSignal(xstart, 2, [ (1, '0'), (8, '1'), (16, '0'), (19, '') ])
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c.text(0, 1, '\\textsf{\\textbf{ERRPAR}}')
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drawSignal(xstart, 1, [ (1, '0'), (15.5, '1'), (16.5, '0'), (19, '') ])
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c.stroke(path.line(xstart+6*clockWidth, 4.8, xstart+6*clockWidth, 2.6), [ style.linewidth.Thin ])
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c.stroke(path.line(xstart+8*clockWidth, 3.8, xstart+8*clockWidth, 1.6), [ style.linewidth.Thin ])
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c.writeEPSfile('timing_link.eps')
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