HD3SS2521 Datasheet, PDF (13/18 Pages) Texas Instruments – DockPort Controller

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TEST TIMING DIAGRAMS
50%
HS_SEL_IN/SS_SEL_IN
HD3SS2521
SLAS941A – APRIL 2013 – REVISED MAY 2013
90%
VOUT
10%
Ton
Toff
Figure 4. Select to Switch T_on and T_off
Vcc
Ax(p)
Bx/Cx(p)
50 Ω
50 Ω
Ax(n)
Bx/Cx(n)
50 Ω
Cx/Bx (p)
50%
SEL
50%
50 Ω
Cx/Bx (n)
Ax (p)
Ax (n)
50%
tP1
50%
tP2
Inter-pair skew
tPD = Max(tp1, t p2)
tSK(O) = Difference between t _PD for any
two pairs of outputs
Bx/Cx(p)
Ax(p)
Bx/Cx(n)
Ax(n)
t1
t2
t3
t4
DCx/DBx/DAx (p)
50%
Cx/Bx/Ax (n)
Cx/Bx/Ax (p)
tSK(O)
Cx/Bx/Ax (n)
Intra-pair skew
tSK(b-b) = 0.5 X |(t 4 – t 3) + (t 1 – t 2)|
NOTES:
1. Measurements based on an ideal input with zero intra-pair skew on
the input, i.e. the input at A to B/C or the input at B/C to A
2. Inter-pair skew is measured from lane to lane on the same channel,
e.g. C0 to C1
3. Intra-pair skew is defined as the relative difference from the p and n
signals of a single lane
Figure 5. Propagation Delay and Skew
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