MSC8252 datasheet(34/68 Pages) FREESCALE

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

Electrical Characteristics

Freescale Semiconductor

Table 16 describes the SGMII SerDes receiver AC-coupled DC electrical characteristics.

Table 16. SGMII DC Receiver Electrical Characteristics5

Parameter

Symbol

Min

Typ

Max

Unit

Notes

DC Input voltage range

—

N/A

—

Input

differential

voltage

SRDSnCR4[EICE{12:10}] = 0b001 for SGMII1

SRDSnCR4[EICF{4:2}] = 0b001 for SGMII2

VRX_DIFFp-p

100

—

1200

2, 4

SRDSnCR4[EICE{12:10}] = 0b100 for SGMII1

SRDSnCR4[EICF{4:2}] = 0b100 for SGMII2

175

—

Loss of

signal

threshold

SRDSnCR4[EICE{12:10}] = 0b001 for SGMII1

SRDSnCR4[EICF{4:2}] = 0b001 for SGMII2

VLOS

—

100

3, 4

SRDSnCR4[EICE{12:10}] = 0b100 for SGMII1

SRDSnCR4[EICF{4:2}] = 0b100 for SGMII2

—

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 values for SGMII1 and SGMII2 are selected in the SRDS control registers.

The supply voltage is 1.0 V.

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