MPC5125 datasheet(64/92 Pages) FREESCALE

64 / 92 page

MPC5125 Microcontroller Data Sheet, Rev. 3

Electrical and Thermal Characteristics

Freescale Semiconductor

Figure 27. Ethernet Timing Diagram — MII and RMII Rx Signal

Table 28. RMII Rx Signal Timing

Sym

Description

Min

Max

Unit

SpecID

RXD[1:0], RX_DV, RX_ER to TX_CLK setup

—

A11.5

TX_CLK to RXD[1:0], RX_DV, RX_ER hold

—

A11.6

TX_CLK pulse width high

35%

65%

TX_CLK period1

NOTES:

1 TX_CLK frequency shall be 50 MHz regardless of the data rate. See the RMII specification.

A11.7

TX_CLK pulse width low

35%

65%

TX_CLK period1

A11.8

Table 29. MII Tx Signal Timing

Sym

Description

Min

Max

Unit

SpecID

TX_CLK rising edge to TXD[3:0], TX_EN, TX_ER invalid

—

A11.9

t10

TX_CLK rising edge to TXD[3:0], TX_EN, TX_ER valid

—

A11.10

t11

TX_CLK pulse width high

35%

65%

TX_CLK Period1

NOTES:

1 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.

A11.11

t12

TX_CLK pulse width low

35%

65%

TX_CLK Period1

A11.12

Table 30. RMII Tx Signal Timing

Sym

Description

Min

Max

Unit

SpecID

t13

TX_CLK rising edge to TXD[1:0], TX_EN, TX_ER invalid

—

A11.13

t14

TX_CLK rising edge to TXD[1:0], TX_EN, TX_ER valid

—

A11.14

t15

TX_CLK pulse width high

35%

65%

TX_CLK Period1

NOTES:

1 TX_CLK frequency shall be 50 MHz regardless of the data rate. See the RMII specification.

A11.15

t16

TX_CLK pulse width low

35%

65%

TX_CLK Period1

A11.16

t4, t8

t3, t7

t1. t5

t2. t6

REF_CLK (Input)

RXD[3:0] (inputs)

RX_DV

RX_ER

REF_CLK is TX_CLK in RMII mode, and is RX_CLK in non-RMII mode

MPC5125 Scheda tecnica(PDF) 64 Page - Freescale Semiconductor, Inc

MPC5125 Scheda tecnica(HTML) 64 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92

Scheda tecnica Scarica

Link URL