mpc8641 Freescale Semiconductor, Inc, mpc8641 Datasheet - Page 44

• Manufacturer Part Number: mpc8641
• Description: Integrated Host Processor Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

Ethernet Management Interface Electrical Characteristics
Figure 23
Figure 24
44
At recommended operating conditions with OV
MDIO to MDC hold time
MDC rise time
MDC fall time
Notes:
1. The symbols used for timing specifications herein follow the pattern of t
2. This parameter is dependent on the system clock speed. (The maximum frequency is the maximum platform frequency
3. This parameter is dependent on the system clock speed. (That is, for a system clock of 267 MHz, the maximum frequency
4. Guaranteed by design.
5. t
(reference)(state)
symbolizes management data timing (MD) for the time t
invalid (X) or data hold time. Also, t
signals (D) reach the valid state (V) relative to the t
rise and fall times, the latter convention is used with the appropriate letter: R (rise) or F (fall).
divided by 64.)
is 8.3 MHz and the minimum frequency is 1.2 MHz; for a system clock of 375 MHz, the maximum frequency is 11.7 MHz
and the minimum frequency is 1.7 MHz.)
MPXCLK
Parameter/Condition
provides the AC test load for eTSEC.
shows the MII management AC timing diagram.
is the platform (MPX) clock
MPC8641 and MPC8641D Integrated Host Processor Hardware Specifications, Rev. 2
Output will see a 50-Ω load since what it sees is the transmission line.
for inputs and t
(Output)
(Input)
MDIO
MDIO
MDC
Table 39. MII Management AC Timing Specifications (continued)
Output
Figure 24. MII Management Interface Timing Diagram
(first two letters of functional block)(reference)(state)(signal)(state)
t
MDDVKH
MDCH
DD
Symbol
t
MDDXKH
t
t
t
MDDVKH
is 3.3 V ± 5%.
MDCR
MDHF
Figure 23. eTSEC AC Test Load
t
MDC
symbolizes management data timing (MD) with respect to the time data input
Z
t
MDKHDX
0
1
= 50 Ω
MDC
NOTE
MDC
clock reference (K) going to the high (H) state or setup time. For
Min
—
—
0
from clock reference (K) high (H) until data outputs (D) are
t
MDCF
t
MDDXKH
(first two letters of functional block)(signal)(state)
R
Typ
—
—
—
t
L
MDCR
= 50 Ω
for outputs. For example, t
OV
Max
10
10
—
DD
/2
Freescale Semiconductor
Unit
ns
ns
ns
MDKHDX
Notes
—
4
4