Ethernet: Enhanced Three-Speed Ethernet (eTSEC)
8.3.4
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 depicted in Figure 25, respectively.
8.3.4.1
SGMII Transmit AC Timing Specifications
Table 39 provides the SGMII transmit AC timing targets. A source synchronous clock is not provided.
Table 39. SGMII Transmit AC Timing Specifications
At recommended operating conditions with XVDD_SRDS2 = 1.1V ± 5%.
Parameter
Symbol
Min
Typ
Max
Unit
Notes
Deterministic Jitter
Total Jitter
JD
JT
—
—
—
—
0.17
0.35
UI p-p
UI p-p
ps
—
—
1
Unit Interval
UI
799.92
50
800
—
800.08
120
V
V
fall time (80%-20%)
rise time (20%-80%)
tfall
ps
—
—
OD
OD
t
50
—
120
ps
rise
Notes:
1. Each UI is 800 ps ± 100 ppm.
8.3.4.2
SGMII Receive AC Timing Specifications
Table 40 provides the SGMII receive AC timing specifications. Source synchronous clocking is not
supported. Clock is recovered from the data. Figure 24 shows the SGMII receiver input compliance mask
eye diagram.
Table 40. SGMII Receive AC Timing Specifications
At recommended operating conditions with XVDD_SRDS2 = 1.1V ± 5%.
Parameter
Deterministic Jitter Tolerance
Symbol
Min
Typ
Max
Unit
Notes
JD
JDR
JSIN
JT
0.37
0.55
0.1
—
—
—
—
—
—
UI p-p
UI p-p
UI p-p
UI p-p
—
1
1
Combined Deterministic and Random Jitter Tolerance
Sinusoidal Jitter Tolerance
Total Jitter Tolerance
—
1
0.65
—
—
1
-12
Bit Error Ratio
BER
UI
—
10
—
2
Unit Interval
799.92
5
800
—
800.08
200
ps
AC Coupling Capacitor
C
nF
3
TX
Notes:
1. Measured at receiver.
2. Each UI is 800 ps ± 100 ppm.
3. The external AC coupling capacitor is required. It is recommended to be placed near the device transmitter outputs.
™
4. Refer to RapidIO 1x/4x LP Serial Physical Layer Specification for interpretation of jitter specifications.
MPC8572E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 4
Freescale Semiconductor
47
FREESCALE [ Freescale ]
