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5.1 Physical Interface
C141-E203-01EN 5-7
Table 5.1 Physical Layer Electrical Requirements (2/2)
Nom Min Max Units Comments
Rx single-ended
impedance
40 Ohm As seen by TDR with 100 ps (max) edge
looking into connector (20%-80%).
TDR set to produce simultaneous positive
pulses on both signals of the Rx pair.
C
ACcoupling
12 nF Coupling capacitance value for AC
coupled TX and RX pairs
TX DC clock
frequency skew
-350 +350 ppm Specifies the allowed ppm tolerance for
TX DC frequency variations around the
nominal 1.5GHz
TX AC clock
frequency skew
-5000 +0 ppm Specifies the allowed ppm tolerance for
TX AC frequency variations around the
nominal 1.5GHz
TX differential
skew
20 ps Nominal value architecture specific
Squelch
detector
threshold
100 50 200 mV
p-p
Minimum differential signal amplitude
COMRESET/C
OMINIT
detector off
threshold
175 525 ns Detector shall reject all bursts with
spacings outside this spec
COMRESET/C
OMINIT
detector on
threshold
320 304 336 ns Detector shall detect all bursts with
spacings meeting this period
COMRESET/C
OMINIT
transmit
spacing
320.0 310.4 329.6 ns Differential crosspoints of last and first
edges of bursts
COMWAKE
detector off
threshold
55 175 ns Detector shall reject all bursts with
spacings outside this spec
COMWAKE
detector on
threshold
106.7 101.3 112 ns Detector shall detect all burst spacings
meeting this period
COMWAKE
transmit
spacing
106.7 103.5 109.9 ns Differential crosspoints from last to first
edges of bursts
UI
OOB
646.67
686.67
ps Operating data period during OOB burst
transmission