mpc8309 Freescale Semiconductor, Inc, mpc8309 Datasheet - Page 27

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

Figure 15
8.2.2.2
Table 21
Freescale Semiconductor
At recommended operating conditions with OV
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 V
REF_CLK clock fall time V
Note:
1. The symbols used for timing specifications follow the pattern of t
inputs and t
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
to the time data input signals (D) went invalid (X) relative to the t
time. 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
the latter 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 receive AC timing specifications.
shows the RMII transmit AC timing diagram.
(first two letters of functional block)(reference)(state)(signal)(state)
RMII Receive AC Timing Specifications
Parameter/Condition
REF_CLK
TXD[1:0]
TX_EN
IL
(min) to V
IH
(max) to V
Table 23. RMII Receive AC Timing Specifications
IH
(max)
Figure 15. RMII Transmit AC Timing Diagram
t
IL
RMXH
(min)
DD
of 3.3 V ± 300mV.
t
RMX
RMX
represents the RMII (RM) reference (X) clock. For rise and fall times,
t
t
RMXH
t
t
Symbol
RMRDXKL
RMTKHDX
RMRDVKH
RMRDXKH
t
RMXF
t
t
t
RMXR
RMXF
RMX
(first three letters of functional block)(signal)(state)(reference)(state)
RMX
for outputs. For example, t
/t
RMX
clock reference (K) going to the low (L) state or hold
1
symbolizes RMII receive timing (RMR) with respect
t
RMXR
Min
4.0
2.0
1.0
1.0
35
—
Typical
RMRDVKH
20
—
—
—
—
—
Ethernet and MII Management
symbolizes RMII
Max
4.0
4.0
65
—
—
—
RMX
clock
Unit
ns
ns
ns
ns
ns
%
for
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