
Electrical Characteristics
MPC8535E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5
Freescale Semiconductor
57
2.9.3.4
SGMII AC Timing Specifications
This section describes the SGMII transmit and receive AC timing specifications. Transmitter and receiver characteristics are
measured at the transmitter outputs (SD2_TX[n] and SD2_TX[n]) or at the receiver inputs (SD2_RX[n] and SD2_RX[n]) as
2.9.3.4.1
SGMII Transmit AC Timing Specifications
This table provides the SGMII transmit AC timing targets. A source synchronous clock is not provided.
Receiver differential input impedance
ZRX_DIFF
80
100
120
Ω
—
Receiver common mode input
impedance
ZRX_CM
20
—
35
Ω
—
Common mode input voltage
VCM
—Vxcorevss
—V
6
Notes:
1. Input must be externally AC-coupled.
2. VRX_DIFFp-p is also referred to as peak to peak input differential voltage
3. The concept of this parameter is equivalent to the Electrical Idle Detect Threshold parameter in PCI Express. See
Table 72for further explanation.
4. The LSTS shown in the table refers to the LSTSA or LSTSE bit field of chip’s SerDes 2 control register.
5. VCM_ACp-p is also referred to as peak to peak AC common mode voltage.
6. On-chip termination to S2GND (xcorevss).
Table 41. SGMII Transmit AC Timing Specifications
At recommended operating conditions with X2VDD = 1.0V ± 5%.
Parameter
Symbol
Min
Typ
Max
Unit
Notes
Deterministic Jitter
JD
—
0.17
UI p-p
—
Total Jitter
JT
—
0.35
UI p-p
—
Unit Interval
UI
799.92
800
800.08
ps
1
VOD fall time (80%-20%)
tfall
50
—
120
ps
—
VOD rise time (20%-80%)
trise
50
—
120
ps
—
Notes:
1. Each UI is 800 ps ± 100 ppm.
Table 40. SGMII DC Receiver Electrical Characteristics (continued)
Parameter
Symbol
Min
Typ
Max
Unit
Notes