NQ41210SL7JE Datasheet, PDF (21/52 Pages) Intel Corporation – Intel® 41210 Serial to Parallel PCI Bridge

Datasheet — 41210 Bridge
3.1.6.2
Table 16.
Differential Receiver (RX) DC Input Specifications
Table 16 defines the DC specifications of parameters for all differential Receivers (RXs). The
parameters are specified at the component pins.
Differential Receiver (RX) DC Input Specifications
Symbol
Parameter
Min Nom Max Units
Comments
Differential Input
V_RX-DIFFp-p Peak to Peak
Voltage
0.17
5
1.20
0
V
V_RX-CM-ACp
AC Peak Common
Mode Input Voltage
150 mV
RL_RX-DIFF
Differential Return
Loss
15
RL_RX-CM
Common Mode
Return Loss
6
Z_RX-DIFF-DC
DC Differential Input
Impedance
80
Z_RX-COM-
DC
DC Input Common
Mode Input
40
Impedance
dB
dB
100 120 W
50 60 W
Z_RX-COM-
Initial DC Input
Common Mode
5
INITIAL-DC _{Input Impedance}
50 60 W
Z_RX-COM-
HIGH-IMP-
DC
V_RX-IDLE-
DET-DIFFp-
p
Powered Down DC
Input Common
Mode Input
Impedance
200 k
Electrical Idle
Detect Threshold
65
W
175 mV
V_RX-DIFFp-p = 2*|V_{RX-D+ -} V_RX-D-|
See Note 1.
V_RX-CM-AC=
|V_RX-D+ + _VRX-D-|/2– V_RX-CM-DC
V_{RX-CM-DC =}
DC_(avg) of |V_RX-D++V_RX-D-|/2 during L0
See Note 1.
Measured over 50 MHz to 1.25 GHz
See Note 2.
Measured over 50 MHz to 1.25 GHz
See Note 2
RX DC Differential Mode impedance.
See Note 3.
RX DC Common Mode impedance 50
?+/-20% tolerance.
See Notes 1 and 3.
RX DC Common Mode impedance
allowed when the receiver terminations
are first powered on.
See Note 4.
RX DC Common Mode impedance when
the receiver terminations are not
powered (i.e., no power).
See Note 5.
V_{RX-IDLE-DET-DIFFp-p} =2*|V_RX-D+ - _VRX-D-|
Measured at the package pins of the
Receiver.
1. Specified at the measurement point and measured over any 250 consecutive UIs. The test load in Figure 2,
“Compliance Test/Measurement Load” on page 23 should be used as the RX device when taking
measurements (also refer to the Receiver Compliance Eye Diagram as shown in Figure 3, “Minimum
Receiver Eye Timing and Voltage Compliance Specification” on page 23). If the clocks to the RX and TX are
not derived from the same clock chip the TX UI must be used as a reference for the eye diagram.
2. The receiver input impedance shall result in a differential return loss greater than or equal to 15 dB and a
common mode return loss greater than or equal to 6 dB over a frequency range of 50 MHz to 1.25 GHz. This
input impedance requirement applies to all valid input levels. The reference impedance for return loss
measurements for is 50 Ω to ground for both the D+ and D- line (i.e., as measured by a Vector Network
Analyzer with 50Ω probes - see Figure 2). Note: that the series capacitors C_TX is optional for the return loss
measurement.
3. Impedance during all operating conditions.
4. The Rx DC Common Mode Impedance that must be present when the receiver terminations are first enabled
to ensure that the Receiver Detect occurs properly. Compensation of this impedance can start immediately
and the (Z_RX-COM-DC)RxDC Common Mode Impedance must be with in the specified range by the time
Detect is entered.
5. The Rx DC Common Mode Impedance that exists when the receiver terminations are disabled or when no
power is present. This helps ensure that the Receiver Detect circuit will not falsely assume a receiver is
powered on when it is not.
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