mpc8379e Freescale Semiconductor, Inc, mpc8379e Datasheet - Page 29

• Manufacturer Part Number: mpc8379e
• Description: Powerquicc Ii Pro Processor Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

At recommended operating conditions with LV
Figure 12
8.2.3.2
Table 30
At recommended operating conditions with LV
Freescale Semiconductor
Fall time REF_CLK (80%–20%)
REF_CLK to RMII data TXD[1:0], TX_EN delay
Note:
1
Input low voltage at 3.3 LV
Input high voltage at 3.3 LV
REF_CLK clock period
REF_CLK duty cycle
REF_CLK peak-to-peak jitter
Rise time REF_CLK (20%–80%)
Fall time REF_CLK (80%–20%)
The symbols used for timing specifications herein follow the pattern of t
for inputs and t
transmit timing (MT) 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).
shows the RMII receive AC timing specifications.
shows the RMII transmit AC timing diagram.
RMII Receive AC Timing Specifications
REF_CLK
(first two letters of functional block)(reference)(state)(signal)(state)
TXD[1:0]
TX_EN
TX_ER
Parameter/Condition
Parameter
MPC8379E PowerQUICC II Pro Processor Hardware Specifications, Rev. 3
Table 29. RMII Transmit AC Timing Specifications (continued)
DD
DD
Table 30. RMII Receive AC Timing Specifications
MTX
Figure 12. RMII Transmit AC Timing Diagram
t
RMTH
clock reference (K) going high (H) until data outputs (D) are invalid (X). Note that, in
DD
DD
of 3.3 V ± 5%.
of 3.3 V ± 5%.
MTX
t
RMT
represents the MII(M) transmit (TX) clock. For rise and fall times, the latter
Symbol
t
RMTDX
t
RMTF
t
t
RMTDX
RMTF
Symbol
1
t
t
t
t
t
RMRH
RMRR
for outputs. For example, t
RMRF
RMRJ
RMR
V
V
(first two letters of functional block)(signal)(state) (reference)(state)
IH
IL
1
t
Ethernet: Enhanced Three-Speed Ethernet (eTSEC)
RMTR
Min
1.0
2.0
15.0
Min
2.0
1.0
1.0
35
—
—
Typical
—
—
Typical
20.0
MTKHDX
—
—
50
—
—
—
Max
10.0
symbolizes MII
2.0
Max
25.0
250
0.8
2.0
2.0
65
—
Unit
Unit
ns
ns
ns
ps
ns
ns
%
V
V
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