PCIMX258CJM4A datasheet(88/144 Pages) FREESCALE

Part #	PCIMX258CJM4A

Description	i.MX25 Applications Processor for Consumer and Industrial Products

PDF	144 Pages

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Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

Direct Link	http://www.freescale.com

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i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 3

Freescale Semiconductor

3.7.9.3

RMII Mode Timing

In RMII mode, FEC_TX_CLK is used as the REF_CLK, which is a 50 MHz ± 50 ppm continuous

reference clock. FEC_RX_DV is used as the CRS_DV in RMII. Other signals under RMII mode include

FEC_TX_EN, FEC_TXD[1:0], FEC_RXD[1:0] and FEC_RX_ER.

Figure 59 shows RMII mode timings. Table 64 describes the timing parameters (M16–M21) shown in the

figure.

Figure 59. RMII Mode Signal Timing Diagram

Table 64. RMII Signal Timing

Characteristic

Min.

Max.

Unit

M16

REF_CLK(FEC_TX_CLK) pulse width high

35%

65%

REF_CLK period

M17

REF_CLK(FEC_TX_CLK) pulse width low

35%

65%

REF_CLK period

M18

REF_CLK to FEC_TXD[1:0], FEC_TX_EN invalid

—

M19

REF_CLK to FEC_TXD[1:0], FEC_TX_EN valid

—

M20

FEC_RXD[1:0], CRS_DV(FEC_RX_DV), FEC_RX_ER to REF_CLK setup

—

M21

REF_CLK to FEC_RXD[1:0], FEC_RX_DV, FEC_RX_ER hold

—

REF_CLK (input)

FEC_TX_EN

M16

M17

M18

M19

M20

M21

FEC_RXD[1:0]

FEC_TXD[1:0] (output)

FEC_RX_ER

CRS_DV (input)

PCIMX258CJM4A Datasheet(PDF) 88 Page - Freescale Semiconductor, Inc

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