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