Ethernet Management Interface Electrical Characteristics
Table 41. eTSEC IEEE 1588 AC Timing Specifications (continued)
At recommended operating conditions with LVDD/TVDD of 3.3 V ± 5% or 2.5 V ± 5%
Parameter/Condition
Symbol
Min
Typ
Max
Unit
Note
TSEC_1588_CLK_OUT duty cycle
t
30
50
70
%
—
T1588CLKOTH
/t
T1588CLKOUT
TSEC_1588_PULSE_OUT
TSEC_1588_TRIG_IN pulse width
Note:
t
0.5
—
—
3.0
—
ns
ns
—
2
T1588OV
t
2*t
T1588CLK_MAX
T1588TRIGH
1.When TMR_CTRL[CKSEL] is set as ‘00’, the external TSEC_1588_CLK input is selected as the 1588 timer reference clock
source, with the timing defined in Table 41, “eTSEC IEEE 1588 AC Timing Specifications.” The maximum value of t
T1588CLK
is defined in terms of T
, that is the maximum clock cycle period of the equivalent interface speed that the eTSEC1
TX_CLK
port is running at. When eTSEC1 is configured to operate in the parallel mode, the T
is the maximum clock period
TX_CLK
of the TSEC1_TX_CLK. When eTSEC1 operates in SGMII mode, the maximum value of t
is defined in terms of
T1588CLK
the recovered clock from SGMII SerDes. For example, for SGMII 10/100/1000 Mbps modes, the maximum value of
is 3600, 360, 72 ns respectively. See the MPC8572E PowerQUICC™ III Integrated Communications Processor
t
T1588CLK
Reference Manual for detailed description of TMR_CTRL registers.
2. It needs to be at least two times of the clock period of the clock selected by TMR_CTRL[CKSEL].
9 Ethernet Management Interface Electrical
Characteristics
The electrical characteristics specified here apply to MII management interface signals ECn_MDIO
(management data input/output) and ECn_MDC (management data clock). The electrical characteristics
for GMII, SGMII, RGMII, RMII, TBI and RTBI are specified in “Section 8, “Ethernet: Enhanced
Three-Speed Ethernet (eTSEC).”
9.1
MII Management DC Electrical Characteristics
The ECn_MDC and ECn_MDIO are defined to operate at a supply voltage of 3.3 V or 2.5 V. The DC
electrical characteristics for ECn_MDIO and ECn_MDC are provided in Table 42 and Table 43.
Table 42. MII Management DC Electrical Characteristics(LV /TV =3.3 V)
DD
DD
Parameter
Symbol
LV /TV
Min
Max
Unit
Notes
Supply voltage (3.3 V)
Output high voltage
3.13
2.10
3.47
V
V
1, 2
—
DD
DD
V
OV + 0.3
OH
DD
(LV /TV = Min, I = –1.0 mA)
DD
DD
OH
Output low voltage
(LV /TV =Min, I = 1.0 mA)
V
GND
0.50
V
—
OL
DD
DD
OL
Input high voltage
Input low voltage
Input high current
V
2.0
—
—
0.90
40
V
V
—
—
—
IH
V
I
IL
—
μA
IH
3
(LV /TV = Max, V
= 2.1 V)
DD
DD
IN
MPC8572E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 4
Freescale Semiconductor
50
FREESCALE [ Freescale ]
