Datasheet

i.MX 6Dual/6Quad Applications Processors for Industrial Products, Rev. 6, 11/2018
80 NXP Semiconductors
Electrical Characteristics
4.12.5.1.2 MII Transmit Signal Timing
(ENET_TX_DATA3,2,1,0, ENET_TX_EN, ENET_TX_ER, and ENET_TX_CLK)
The transmitter functions correctly up to an ENET_TX_CLK maximum frequency of 25 MHz + 1%.
There is no minimum frequency requirement. Additionally, the processor clock frequency must exceed
twice the ENET_TX_CLK frequency.
Figure 41 shows MII transmit signal timings. Table 50 describes the timing parameters (M5–M8) shown
in the figure.
Figure 41. MII Transmit Signal Timing Diagram
1
ENET_TX_EN, ENET_TX_CLK, and ENET0_TXD0 have the same timing in 10-Mbps 7-wire interface mode.
4.12.5.1.3 MII Asynchronous Inputs Signal Timing (ENET_CRS and ENET_COL)
Figure 42 shows MII asynchronous input timings. Table 51 describes the timing parameter (M9) shown in
the figure.
Figure 42. MII Async Inputs Timing Diagram
Table 50. MII Transmit Signal Timing
ID Characteristic
1
Min Max Unit
M5 ENET_TX_CLK to ENET_TX_DATA3,2,1,0, ENET_TX_EN,
ENET_TX_ER invalid
5— ns
M6 ENET_TX_CLK to ENET_TX_DATA3,2,1,0, ENET_TX_EN,
ENET_TX_ER valid
—20 ns
M7 ENET_TX_CLK pulse width high 35% 65% ENET_TX_CLK period
M8 ENET_TX_CLK pulse width low 35% 65% ENET_TX_CLK period
ENET_TX_CLK (input)
ENET_TX_DATA3,2,1,0
M7
M8
M5
M6
ENET_TX_ER
ENET_TX_EN
(outputs)
ENET_CRS, ENET_COL
M9