mpc8378e Freescale Semiconductor, Inc, mpc8378e Datasheet - Page 27

• Manufacturer Part Number: mpc8378e
• Description: Powerquicc Ii Pro Processor Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

8.2.3
See
8.3
The AC timing specifications for SGMII, MII, RGMII, RMII, and RTBI are presented in this section.
Freescale Semiconductor
Input differential voltage
Loss of signal threshold
Input AC common mode voltage
Receiver differential input
impedance
Receiver common mode input
impedance
Common mode input voltage
Note:
1
2
3
4
5
6
Input must be externally AC-coupled.
V
The concept of this parameter is equivalent to the Electrical Idle Detect Threshold parameter in PCI Express. Refer to PCI
Express Differential Receiver (RX) Input Specifications section for further explanation.
The SEIC x shown in the table refers to SRDS n CR[SEICA] for lane A and SRDS n CR[SEICE] for lane E.
V
On-chip termination to SGND_SRDS n (xcorevss).
RX_DIFFp-p
CM_ACp-p
Section 20.2.2, “DC Level Requirement for SerDes Reference Clocks.”
SGMII, MII, RGMII, RMII, and RTBI AC Timing Specifications
Parameter
is also referred to as peak to peak AC common mode voltage.
DC Requirements for SGMII SD_REF_CLK and SD_REF_CLK_B
is also referred to as peak to peak input differential voltage.
Table 27. SGMII DC Receiver Electrical Characteristics (continued)
MPC8378E PowerQUICC II Pro Processor Hardware Specifications, Rev. 3
SEIC x = 01
SEIC x = 00
SEIC x = 01
SEIC x = 00
MPC8378E SGMII
SerDes Interface
Transmitter
Figure 8. SGMII Transmitter DC Measurement Circuit
V
V
50 Ω
50 Ω
Z
RX_DIFFp-p
Symbol
Z
CM_ACp-p
RX_DIFF
V
RX_CM
V
LOS
CM
L1_SD_TX n
L1_SD_TX n
Min
100
175
30
65
80
20
—
V
50 Ω
50 Ω
Typical
xcorevss
100
—
—
—
—
Ethernet: Enhanced Three-Speed Ethernet (eTSEC)
V
1200
os
Max
100
175
100
120
35
—
V
OD
Unit
mV
mV
mV
Ω
Ω
V
Notes
2, 4
3, 4
—
—
5
6
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