mpc5125 Freescale Semiconductor, Inc, mpc5125 Datasheet - Page 64

• Manufacturer Part Number: mpc5125
• Description: Mpc5125 Microcontroller Data Sheet
• Manufacturer: Freescale Semiconductor, Inc

Electrical and Thermal Characteristics
NOTES:
1
NOTES:
1
NOTES:
1
64
Sym
Sym
Sym
TX_CLK frequency shall be 50 MHz regardless of the data rate. See the RMII specification.
The TX_CLK frequency shall be 25% of the nominal transmit frequency, for example, a PHY operating at 100 Mb/s must
provide a TX_CLK frequency of 25 MHz and a PHY operating at 10 Mb/s must provide a TX_CLK frequency of 2.5 MHz. See
the IEEE 802.3 specification.
TX_CLK frequency shall be 50 MHz regardless of the data rate. See the RMII specification.
t
t
t
t
t
t
t
t
13
14
15
16
t
t
t
t
10
11
12
9
5
6
7
8
TX_CLK rising edge to TXD [ 1 : 0 ], TX_EN, TX_ER invalid
TX_CLK rising edge to TXD [ 1 : 0 ], TX_EN, TX_ER valid
TX_CLK pulse width high
TX_CLK pulse width low
TX_CLK rising edge to TXD [ 3 : 0 ], TX_EN, TX_ER invalid
TX_CLK rising edge to TXD [ 3 : 0 ], TX_EN, TX_ER valid
TX_CLK pulse width high
TX_CLK pulse width low
RXD [ 1 : 0 ], RX_DV, RX_ER to TX_CLK setup
TX_CLK to RXD [ 1 : 0 ], RX_DV, RX_ER hold
TX_CLK pulse width high
TX_CLK pulse width low
RXD[3:0] (inputs)
REF_CLK is TX_CLK in RMII mode, and is RX_CLK in non-RMII mode
REF_CLK (Input)
RX_ER
RX_DV
Figure 27. Ethernet Timing Diagram — MII and RMII Rx Signal
Description
Description
Description
MPC5125 Microcontroller Data Sheet, Rev. 3
Table 28. RMII Rx Signal Timing
Table 30. RMII Tx Signal Timing
Table 29. MII Tx Signal Timing
t
1
. t
5
t
2
. t
t
6
3
, t
7
35%
35%
Min
4
2
35%
35%
Min
—
35%
35%
Min
3
—
3
t
4
, t
65%
65%
Max
—
—
8
65%
65%
Max
Max
65%
65%
25
—
—
14
TX_CLK period
TX_CLK period
TX_CLK Period
TX_CLK Period
TX_CLK Period
TX_CLK Period
Unit
Freescale Semiconductor
ns
ns
Unit
Unit
ns
ns
ns
ns
1
1
1
1
1
1
SpecID
SpecID
SpecID
A11.11
A11.12
A11.10
A11.13
A11.14
A11.15
A11.16
A11.5
A11.6
A11.7
A11.8
A11.9