MPC8535ECVTATH datasheet(101/126 Pages) FREESCALE

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TTX-IDLE-SET-TO-IDLE

Maximum time to

transition to a valid

electrical idle after

sending an

electrical Idle

ordered set

—

After sending an Electrical Idle ordered set, the

Transmitter must meet all Electrical Idle Specifications

within this time. This is considered a debounce time

for the Transmitter to meet Electrical Idle after

transitioning from L0.

TTX-IDLE-TO-DIFF-DATA Maximum time to

transition to valid

TX specifications

after leaving an

electrical idle

condition

—

Maximum time to meet all TX specifications when

transitioning from Electrical Idle to sending differential

data. This is considered a debounce time for the TX to

meet all TX specifications after leaving Electrical Idle

RLTX-DIFF

Differential Return

Loss

—

Measured over 50 MHz to 1.25 GHz. See Note 4

RLTX-CM

Common Mode

Return Loss

—

Measured over 50 MHz to 1.25 GHz. See Note 4

ZTX-DIFF-DC

DC Differential TX

Impedance

100

120

TX DC Differential mode Low Impedance

ZTX-DC

Transmitter DC

Impedance

—

Required TX D+ as well as D- DC Impedance during

all states

LTX-SKEW

Lane-to-Lane

Output Skew

—

500 +

2 UI

Static skew between any two Transmitter Lanes within

a single Link

CTX

AC Coupling

Capacitor

—

200

All Transmitters shall be AC coupled. The AC coupling

is required either within the media or within the

transmitting component itself. See Note 8.

Tcrosslink

Crosslink Random

Timeout

—

This random timeout helps resolve conflicts in

crosslink configuration by eventually resulting in only

one Downstream and one Upstream Port. See Note 7.

Notes:

1. No test load is necessarily associated with this value.

2. Specified at the measurement point into a timing and voltage compliance test load as shown in Figure 52 and measured over

any 250 consecutive TX UIs. (Also refer to the transmitter compliance eye diagram shown in Figure 50)

3. A TTX-EYE = 0.70 UI provides for a total sum of deterministic and random jitter budget of TTX-JITTER-MAX = 0.30 UI for the

Transmitter collected over any 250 consecutive TX UIs. The TTX-EYE-MEDIAN-to-MAX-JITTER median is less than half of the total

TX jitter budget collected over any 250 consecutive TX UIs. It should be noted that the median is not the same as the mean.

The jitter median describes the point in time where the number of jitter points on either side is approximately equal as opposed

to the averaged time value.

4. The Transmitter input impedance shall result in a differential return loss greater than or equal to 12 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 is 50 ohms to ground for both the D+

and D- line (that is, as measured by a Vector Network Analyzer with 50 ohm probes—see Figure 52). Note that the series

capacitors CTX is optional for the return loss measurement.

5. Measured between 20-80% at transmitter package pins into a test load as shown in Figure 52 for both VTX-D+ and VTX-D-.

6. See Section 4.3.1.8 of the PCI Express Base Specifications Rev 1.0a

7. See Section 4.2.6.3 of the PCI Express Base Specifications Rev 1.0a

8. SerDes transmitter does not have CTX built-in. An external AC Coupling capacitor is required.

Table 71. Differential Transmitter (TX) Output Specifications (continued)

Symbol

Parameter

Min

Nom

Max

Units

Comments

MPC8535ECVTATH Datasheet(PDF) 101 Page - Freescale Semiconductor, Inc

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