MPC8313ECVRGDDA datasheet(43/100 Pages) FREESCALE

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MPC8313E PowerQUICC™ II Pro Processor Hardware Specifications, Rev. 2.1

Freescale Semiconductor

High-Speed Serial Interfaces (HSSI)

Figure 30 shows the SerDes reference clock connection reference circuits for a single-ended clock driver.

It assumes the DC levels of the clock driver are compatible with the MPC8313E SerDes reference clock

input’s DC requirement.

Figure 30. Single-Ended Connection (Reference Only)

9.2.4

AC Requirements for SerDes Reference Clocks

The clock driver selected should provide a high quality reference clock with low-phase noise and

cycle-to-cycle jitter. Phase noise less than 100 kHz can be tracked by the PLL and data recovery loops and

is less of a problem. Phase noise above 15 MHz is filtered by the PLL. The most problematic phase noise

occurs in the 1–15 MHz range. The source impedance of the clock driver should be 50

Ω to match the

transmission line and reduce reflections which are a source of noise to the system.

Table 40 describes some AC parameters for SGMII protocol.

Table 40. SerDes Reference Clock Common AC Parameters

At recommended operating conditions with XVDD_SRDS1 or XVDD_SRDS2 = 1.0 V ± 5%.

Parameter

Symbol

Min

Max

Unit

Notes

Rising edge rate

Rise edge rate

1.0

4.0

V/ns

2, 3

Falling edge rate

Fall edge rate

1.0

4.0

V/ns

2, 3

Differential input high voltage

VIH

+200

—

Differential input low voltage

VIL

—

–200

n_REF_CLK

100

Ω Differential PWB Trace

Clock Driver

CLK_Out

Single-Ended CLK

Driver Chip

MPC8313E

Total 50

Ω. Assume clock driver’s

output impedance is about 16

Ω.

SerDes Refer.

CLK Receiver

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