41210 datasheet(21/52 Pages) INTEL

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Datasheet — 41210 Bridge

3.1.6.2

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.

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 50

Ω 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 (ZRX-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.

Table 16.

Differential Receiver (RX) DC Input Specifications

Symbol

Parameter

Min

Nom

Max

Units

Comments

VRX-DIFFp-p

Differential Input

Peak to Peak

Voltage

0.17

1.20

VRX-DIFFp-p = 2*|VRX-D+ - VRX-D-|

See Note 1.

VRX-CM-ACp

AC Peak Common

Mode Input Voltage

150

VRX-CM-AC=

|VRX-D+ + VRX-D-|/2– VRX-CM-DC

VRX-CM-DC =

DC(avg) of |VRX-D++VRX-D-|/2 during L0

See Note 1.

RLRX-DIFF

Differential Return

Loss

Measured over 50 MHz to 1.25 GHz

See Note 2.

RLRX-CM

Common Mode

Return Loss

6dB

Measured over 50 MHz to 1.25 GHz

See Note 2

ZRX-DIFF-DC

DC Differential Input

Impedance

100

120

RX DC Differential Mode impedance.

See Note 3.

ZRX-COM-

DC Input Common

Mode Input

Impedance

RX DC Common Mode impedance 50

?+/-20% tolerance.

See Notes 1 and 3.

ZRX-COM-

INITIAL-DC

Initial DC Input

Common Mode

Input Impedance

550

RX DC Common Mode impedance

allowed when the receiver terminations

are first powered on.

See Note 4.

ZRX-COM-

HIGH-IMP-

Powered Down DC

Input Common

Mode Input

Impedance

200 k

RX DC Common Mode impedance when

the receiver terminations are not

powered (i.e., no power).

See Note 5.

VRX-IDLE-

DET-DIFFp-

Electrical Idle

Detect Threshold

175

VRX-IDLE-DET-DIFFp-p =2*|VRX-D+ - VRX-D-|

Measured at the package pins of the

Receiver.

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