Ethernet and MII management
The following figure provides the AC test load.
Output
Z 0 = 50 Ω
R L = 50 Ω
OV DD /2
Figure 11. AC test load
The following figure shows the MII transmit AC timing diagram.
TX_CLK
t MTXH
t MTX
t MTXF
t MTXR
TXD[3:0]
TX_EN
TX_ER
t MTKHDX
Figure 12. MII transmit AC timing diagram
8.2.1.2
MII receive AC timing specifications
The following table provides the MII receive AC timing specifications.
Table 21. MII receive AC timing specifications
At recommended operating conditions with OV DD of 3.3 V ± 300mV.
Parameter/Condition
RX_CLK clock period 10 Mbps
RX_CLK clock period 100 Mbps
RX_CLK duty cycle
RXD[3:0], RX_DV, RX_ER setup time to RX_CLK
RXD[3:0], RX_DV, RX_ER hold time to RX_CLK
RX_CLK clock rise V IL (min) to V IH (max)
RX_CLK clock fall time V IH (max) to V IL (min)
Symbol 1
t MRX
t MRX
t MRXH /t MRX
t MRDVKH
t MRDXKH
t MRXR
t MRXF
Min
35
10.0
10.0
1.0
1.0
Typical
400
40
Max
65
4.0
4.0
Unit
ns
ns
%
ns
ns
ns
ns
Note:
1. The symbols used for timing specifications follow the pattern of t (first two letters of functional block)(signal)(state)(reference)(state) for
inputs and t (first two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, t MRDVKH symbolizes MII receive
timing (MR) with respect to the time data input signals (D) reach the valid state (V) relative to the t MRX clock reference (K)
going to the high (H) state or setup time. Also, t MRDXKL symbolizes MII receive timing (GR) with respect to the time data input
signals (D) went invalid (X) relative to the t MRX clock reference (K) going to the low (L) state or hold time. Note that, in general,
the clock reference symbol representation is based on three letters representing the clock of a particular functional. For
example, the subscript of t MRX represents the MII (M) receive (RX) clock. For rise and fall times, the latter convention is used
with the appropriate letter: R (rise) or F (fall).
MPC8309 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 3
24
Freescale Semiconductor
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