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5-6 C141-E203-01EN
5.1.3 Electrical specifications
Table 5.1 Physical Layer Electrical Requirements (1/2)
Nom Min Max Units Comments
T,UI 666.43 670.12
ps Operating data period (nominal value
architecture specific)
t
rise
0.3 0.15 0.41 UI 20%-80% at transmitter
t
fall
0.3 0.15 0.41 UI 80%-20% at transmitter
V
cm,dc
250 200 450 mV Common mode DC level measured at
receiver connector
V
cm,ac coupled TX
0 2.0 V Transmitter common mode DC level
measured at TX pins
V
cm,ac coupled RX
0 2.0 V Receiver common mode DC level
measured at RX pins
F
CM
2 200 MHz Sinusoidal common-mode noise
components inside this frequency range
with an amplitude of Vcm,ac.
T
settle,CM
10 ns Maximum time for common-mode
transients to and from the idle bus
condition
V
diff,tx
500 400 600
mV
p-p
+/- 250 mV differential nominal.
Measured at Serial ATA connector on
transmit side
V
diff,rx
400 325 600
mV
p-p
+/- 200 mV differential nominal.
Measured at Serial ATA connector on
receive side
Tx pair
differential
impedance
100 85 115 Ohm As seen by a differential TDR with 100 ps
(max) edge looking into connector
(20%-80%). Measured with TDR in
differential mode.
Rx pair
differential
impedance
100 85 115 Ohm As seen by a differential TDR with 100 ps
(max) edge looking into connector
(20%-80%). Measured with TDR in
differential mode.
Tx 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 Tx pair.