MSC8252 datasheet(33/68 Pages) FREESCALE

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Electrical Characteristics

MSC8252 Dual-Core Digital Signal Processor Data Sheet, Rev. 3

Freescale Semiconductor

2.5.3.4

DC-Level Requirements for SGMII Configurations

Note:

Specifications are valid at the recommended operating conditions listed in Table 3

Table 15 describes the SGMII SerDes transmitter AC-coupled DC electrical characteristics. Transmitter DC characteristics are

measured at the transmitter outputs (SR[1–2]_TX[n] and SR[1–2]_TX[n]) as shown in Figure 10.

Table 14. Serial RapidIO Receiver DC Specifications

Parameter

Symbol

Min

Typical

Max

Units

Notes

Differential input voltage

VIN

200

—

1600

mVp-p

Notes:

Measured at receiver.

Table 15. SGMII DC Transmitter Electrical Characteristics5

Parameter

Symbol

Min

Typ

Max

Unit

Notes

DC Input voltage range

—

N/A

—

Input differential voltage

LSTS = 0

VRX_DIFFp-p

100

—

1200

2, 4

LSTS = 1

175

—

Loss of signal threshold

LSTS = 0

VLOS

—

100

3, 4

LSTS = 1

—

175

Receiver differential input impedance

ZRX_DIFF

—

120

—

Notes:

Input must be externally AC-coupled.

VRX_DIFFp-p is also referred to as peak-to-peak input differential voltage.

The concept of this parameter is equivalent to the Electrical Idle Detect Threshold parameter in the PCI Express interface.

Refer to the PCI Express Differential Receiver (RX) Input Specifications section of the PCI Express Specification document. for

details.

The LSTS shown in the table refers to the LSTSAB or LSTSEF bit fields of the SerDes Control Register.

The supply voltage is 1.0 V.

Figure 10. SGMII Transmitter DC Measurement Circuit

Transmitter

SR[1–2]_TXn

Vos

VOD

SGMII SerDes

Interface

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