Freescale Semiconductor MPC8358E Hardware Specificftion page 35

8.2.3.2 RMII Receive AC Timing Specifications
Table 32 provides the RMII receive AC timing specifications.
At recommended operating conditions with LV
Parameter/Condition
REF_CLK clock period
REF_CLK duty cycle
RXD[1:0], CRS_DV, RX_ER setup time to REF_CLK
RXD[1:0], CRS_DV, RX_ER hold time to REF_CLK
REF_CLK clock rise time
REF_CLK clock fall time
Note:
1. The symbols used for timing specifications follow the pattern of t
inputs and t
(first two letters of functional block)(reference)(state)(signal)(state)
receive timing (RMR) with respect to the time data input signals (D) reach the valid state (V) relative to the t
reference (K) going to the high (H) state or setup time. Also, t
the time data input signals (D) went invalid (X) relative to the t
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
convention is used with the appropriate letter: R (rise) or F (fall).
Figure 16 provides the AC test load.
Figure 17 shows the RMII receive AC timing diagram.
REF_CLK
RXD[1:0]
CRS_DV
RX_ER
MPC8360E/MPC8358E PowerQUICC II Pro Processor Revision 2.x TBGA Silicon Hardware Specifications, Rev. 4
Freescale Semiconductor
Table 32. RMII Receive AC Timing Specifications
/OV of 3.3 V ± 10%.
DD DD
represents the RMII (RM) reference (X) clock. For rise and fall times, the latter
RMX
= 50 Ω
Output
Z
0
Figure 16. AC Test Load
t
RMX
t
RMXH
t
RMRDVKH
Figure 17. RMII Receive AC Timing Diagram
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Symbol Min
t
RMX
t /t
RMXH RMX
t
RMRDVKH
t
RMRDXKH
t
RMXR
t
RMXF
(first three letters of functional block)(signal)(state)(reference)(state)
for outputs. For example, t
symbolizes RMII receive timing (RMR) with respect to
RMRDXKL
clock reference (K) going to the low (L) state or hold time.
RMX
= 50 Ω
R
L
t
RMXR
t
RMXF
Valid Data
t
RMRDXKH
Typ Max
— 20 —
35 — 65
4.0 — —
2.0 — —
1.0 — 4.0
1.0 — 4.0
symbolizes RMII
RMRDVKH
RMX
LV /2
DD
Unit
ns
%
ns
ns
ns
ns
for
clock
35