Datasheet

MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 3
Freescale Semiconductor 21
Ethernet: Three-Speed Ethernet, MII Management
and RGMII are specified in Section 8.1, “Enhanced Three-Speed Ethernet Controller (eTSEC)
(10/100/1000 Mbps)—MII/RGMII Electrical Characteristics.”
8.3.1 MII Management DC Electrical Characteristics
The MDC and MDIO are defined to operate at a supply voltage of 3.3 V. This table provides the DC
electrical characteristics for MDIO and MDC.
8.3.2 MII Management AC Electrical Specifications
This table provides the MII management AC timing specifications.
Table 26. MII Management DC Electrical Characteristics When Powered at 3.3 V
Parameter Symbol Conditions Min Max Unit
Supply voltage (3.3 V) NV
DD
—3.03.6V
Output high voltage V
OH
I
OH
= –1.0 mA NV
DD
= Min 2.10 NV
DD
+0.3 V
Output low voltage V
OL
I
OL
= 1.0 mA LV
DD
= Min VSS 0.50 V
Input high voltage V
IH
—2.0—V
Input low voltage V
IL
— — 0.80 V
Input high current I
IH
NV
DD
= Max V
IN
1
= 2.1 V — 40 A
Input low current I
IL
NV
DD
= Max V
IN
= 0.5 V –600 — A
Note:
1. V
IN
, in this case, represents the LV
IN
symbol referenced in Table 1 and Ta ble 2.
Table 27. MII Management AC Timing Specifications
At recommended operating conditions with LV
DDA
/LV
DDB
is 3.3 V ± 0.3V
Parameter/Condition Symbol
1
Min Typ Max Unit Notes
MDC frequency f
MDC
—2.5—MHz2
MDC period t
MDC
—400—ns—
MDC clock pulse width high t
MDCH
32 — — ns —
MDC to MDIO delay t
MDKHDX
10 — 170 ns 3
MDIO to MDC setup time t
MDDVKH
5——ns—
MDIO to MDC hold time t
MDDXKH
0——ns—
MDC rise time t
MDCR
——10ns—