mpc8544e Freescale Semiconductor, Inc, mpc8544e Datasheet - Page 40

• Manufacturer Part Number: mpc8544e
• Description: Mpc8544e Powerquicc Iii Integrated Processor
• Manufacturer: Freescale Semiconductor, Inc

Enhanced Three-Speed Ethernet (eTSEC), MII Management
8.7.5
This section describes the RMII transmit and receive AC timing specifications.
8.7.5.1
The RMII transmit AC timing specifications are in
Figure 23
40
At recommended operating conditions with L/TV
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 follow the pattern of t
inputs and t
timing (MT) for the time t
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
used with the appropriate letter: R (rise) or F (fall).
shows the RMII transmit AC timing diagram.
RMII AC Timing Specifications
(first two letters of functional block)(reference)(state)(signal)(state)
RMII Transmit AC Timing Specifications
Parameter/Condition
REF_CLK
MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 4
TXD[1:0]
TX_EN
TX_ER
MTX
clock reference (K) going high (H) until data outputs (D) are invalid (X). Note that, in general,
MTX
Table 38. RMII Transmit AC Timing Specifications
Figure 23. RMII Transmit AC Timing Diagram
represents the MII(M) transmit (TX) clock. For rise and fall times, the latter convention is
Preliminary—Subject to Change Without Notice
t
RMTH
DD
of 3.3 V ± 5% or 2.5 V ± 5%.
Freescale Confidential Proprietary
t
RMT
Symbol
t
t
t
RMTDX
t
t
RMTH
RMTR
t
RMTF
RMTJ
Table
RMT
t
t
RMTDX
RMTF
(first two letters of functional block)(signal)(state)(reference)(state)
1
for outputs. For example, t
38.
15.0
Min
1.0
1.0
1.0
35
—
t
RMTR
20.0
Typ
50
—
—
—
—
MTKHDX
Max
25.0
10.0
250
2.0
2.0
65
Freescale Semiconductor
symbolizes MII transmit
Unit
ns
ps
ns
ns
ns
%
Notes
for
—
—
—
—
—
—