mpc8568e Freescale Semiconductor, Inc, mpc8568e Datasheet - Page 40

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mpc8568e

Manufacturer Part Number
mpc8568e
Description
Mpc8568e Powerquicc Iii Processor
Manufacturer
Freescale Semiconductor, Inc
Datasheet

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Ethernet Interface and MII Management
Figure 19
8.2.7.2
40
At recommended operating conditions with LV
At recommended operating conditions with L/TV
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
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%)
RXD[1:0], CRS_DV, RX_ER setup time to REF_CLK
rising edge
(reference)(state)
t
(D) are invalid (X). Note that, in 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
(TX) clock. For rise and fall times, the latter convention is used with the appropriate letter: R (rise) or F (fall).
MTKHDX
shows the RMII transmit AC timing diagram.
MPC8568E/MPC8567E PowerQUICC III™ Integrated Processor Hardware Specifications, Rev. 0
RMII Receive AC Timing Specifications
symbolizes MII transmit timing (MT) for the time t
REF_CLK
TXD[1:0]
Parameter/Condition
Parameter/Condition
for inputs and t
TX_EN
TX_ER
Table 35. RMII Transmit AC Timing Specifications (continued)
Table 36. RMII Receive AC Timing Specifications
Figure 19. RMII Transmit AC Timing Diagram
(first two letters of functional block)(reference)(state)(signal)(state)
t
RMTH
DD
DD
of 3.3 V ± 5%.
of 3.3 V ± 5%.
t
RMT
Symbol
Symbol
MTX
t
t
t
t
t
RMTDX
t
t
t
RMRDV
RMTDX
t
RMRH
RMRR
RMTF
RMRJ
RMRF
RMR
clock reference (K) going high (H) until data outputs
1
1
(first two letters of functional block)(signal)(state)
t
RMTR
15.0
Min
Min
1.0
1.0
1.0
4.0
35
MTX
for outputs. For example,
represents the MII(M) transmit
20.0
Typ
Typ
50
Freescale Semiconductor
Max
10.0
Max
25.0
250
2.0
2.0
65
Unit
Unit
ns
ns
ps
ns
ns
ns
%

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