Enhanced Three-Speed Ethernet (eTSEC)
8 Enhanced Three-Speed Ethernet (eTSEC)
This section provides the AC and DC electrical characteristics for the enhanced three-speed Ethernet
controller. The electrical characteristics for MDIO and MDC are specified in Section 9, “Ethernet
Management Interface Electrical Characteristics.”
8.1
Enhanced Three-Speed Ethernet Controller (eTSEC)
(10/100/1Gb Mbps)—GMII/MII/TBI/RGMII/RTBI/RMII Electrical
Characteristics
The electrical characteristics specified here apply to all gigabit media independent interface (GMII), media
independent interface (MII), ten-bit interface (TBI), reduced gigabit media independent interface
(RGMII), reduced ten-bit interface (RTBI), and reduced media independent interface (RMII) signals
except management data input/output (MDIO) and management data clock (MDC). The RGMII and RTBI
interfaces are defined for 2.5 V, while the GMII, MII, and TBI interfaces can be operated at 3.3 or 2.5 V.
The GMII, MII, or TBI interface timing is compliant with the IEEE 802.3. The RGMII and RTBI interfaces
follow the Reduced Gigabit Media-Independent Interface (RGMII) Specification Version 1.3
(12/10/2000). The RMII interface follows the RMII Consortium RMII Specification Version 1.2
(3/20/1998). The electrical characteristics for MDIO and MDC are specified in Section 9, “Ethernet
Management Interface Electrical Characteristics.”
8.1.1
eTSEC DC Electrical Characteristics
All GMII, MII, TBI, RGMII, RMII, and RTBI drivers and receivers comply with the DC parametric
attributes specified in Table 22 and Table 23. The RGMII and RTBI signals are based on a 2.5-V CMOS
interface voltage as defined by JEDEC EIA/JESD8-5.
Table 22. GMII, MII, RMII, and TBI DC Electrical Characteristics
Parameter
Symbol
LV
Min
Max
Unit
Notes
Supply voltage 3.3 V
3.13
3.47
V
1, 2
DD
TV
DD
Output high voltage (LV /TV = min, I = –4.0 mA)
V
2.40
GND
2.0
LV /TV + 0.3
V
V
—
—
DD
DD
OH
OH
DD
DD
Output low voltage (LV /TV = min, I = 4.0 mA)
V
OL
0.50
DD
DD
OL
Input high voltage
Input low voltage
V
LV /TV + 0.3
V
—
IH
DD
DD
V
I
–0.3
—
0.90
V
—
IL
Input high current (V = LV , V = TV
)
40
—
μA
μA
1, 2, 3
—
IN
DD IN
DD
IH
Input low current (V = GND)
I
–600
IN
IL
Notes:
1. LV supports eTSECs 1 and 2.
DD
2. TV supports eTSECs 3 and 4.
DD
3. The symbol V , in this case, represents the LV and TV symbols referenced in Table 1 and Table 2.
IN
IN
IN
MPC8548E PowerQUICC™ III Integrated Processor Hardware Specifications, Rev. 6
Freescale Semiconductor
26
FREESCALE [ Freescale ]
