mpc8641 Freescale Semiconductor, Inc, mpc8641 Datasheet - Page 41

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

At recommended operating conditions with L/TV
8.2.7
This section describes the RMII transmit and receive AC timing specifications.
8.2.7.1
The RMII transmit AC timing specifications are in
Figure 20
Freescale Semiconductor
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%)
REF_CLK to RMII data TXD[1:0], TX_EN delay
Note:
1. 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 transmit AC timing diagram.
RMII AC Timing Specifications
RMII Transmit AC Timing Specifications
Parameter/Condition
(first two letters of functional block)(reference)(state)(signal)(state)
MPC8641 and MPC8641D Integrated Host Processor Hardware Specifications, Rev. 2
REF_CLK
TXD[1:0]
TX_EN
TX_ER
Table 36. RMII Transmit AC Timing Specifications
MTX
Figure 20. RMII Transmit AC Timing Diagram
t
clock reference (K) going high (H) until data outputs (D) are invalid (X). Note that, in
RMTH
DD
MTX
of 3.3 V ± 5%.
t
RMT
represents the MII(M) transmit (TX) clock. For rise and fall times, the latter
t
Symbol
RMTH
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t
Table
t
RMTDX
t
t
RMTR
t
RMTF
RMTJ
RMT
/t
t
t
RMTDX
RMT
RMTF
1
36.
for outputs. For example, t
(first two letters of functional block)(signal)(state) (reference)(state)
Min
1.0
1.0
1.0
t
35
—
—
RMTR
20.0
Typ
50
—
—
—
—
MTKHDX
symbolizes MII
Max
10.0
250
2.0
2.0
65
—
Unit
ns
ps
ns
ns
ns
%
41