mpc8309 Freescale Semiconductor, Inc, mpc8309 Datasheet - Page 26

• Manufacturer Part Number: mpc8309
• Description: Powerquicc Ii Pro Integrated Communications Processor Family Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

Ethernet and MII Management
Figure 13
8.2.2
This section describes the RMII transmit and receive AC timing specifications.
8.2.2.1
Table 20
Figure 14
26
At recommended operating conditions with OV
REF_CLK clock
REF_CLK duty cycle
REF_CLK to RMII data TXD[1:0], TX_EN delay
REF_CLK data clock rise V
REF_CLK data clock fall V
Note:
1. The symbols used for timing specifications follow the pattern of t
inputs and t
transmit timing (RMT) for the time t
general, the clock reference symbol representation is based on two to three letters representing the clock of a particular
functional. For example, the subscript of t
convention is used with the appropriate letter: R (rise) or F (fall).
MPC8309 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 0
provides the RMII transmit AC timing specifications.
provides the AC test load.
shows the MII receive AC timing diagram.
RMII AC Timing Specifications
(first two letters of functional block)(reference)(state)(signal)(state)
RMII Transmit AC Timing Specifications
Parameter/Condition
RXD[3:0]
RX_CLK
RX_DV
RX_ER
IH
IL
Output
(max) to V
(min) to V
Table 22. RMII Transmit AC Timing Specifications
RMX
Figure 13. MII Receive AC Timing Diagram
t
t
IH
MRXH
IL
MRDVKH
(min)
(max)
DD
clock reference (K) going high (H) until data outputs (D) are invalid (X). Note that, in
RMX
of 3.3 V ± 300mV.
t
MRX
represents the RMII(RM) reference (X) clock. For rise and fall times, the latter
Figure 14. AC Test Load
Z
0
= 50 
Valid Data
t
RMXH
t
Symbol
t
RMTKHDX
MRXF
t
t
t
RMXR
RMXF
RMX
(first three letters of functional block)(signal)(state)(reference)(state)
for outputs. For example, t
/t
RMX
1
R
t
MRDXKH
L
t
MRXR
= 50 
Min
1.0
1.0
35
—
2
OV
Typical
DD
RMTKHDX
20
—
—
—
—
/2
Freescale Semiconductor
symbolizes RMII
Max
4.0
4.0
65
13
—
Unit
ns
ns
ns
ns
%
for