BECKHOFF ET1100 - Manual (Page 60)

MII Interface
III-46 Slave Controller – ET1100 Hardware Description
4.4 Timing specifications
Table 51: MII timing characteristics
Parameter Min Typ Max Comment
t
RX_CLK
40 ns ± 100 ppm RX_CLK period (100 ppm with maximum FIFO
Size only)
t
RX_setup
9 ns RX_DV/RX_DATA/RX_D[3:0] valid before rising
edge of RX_CLK
t
RX_hold
3 ns RX_DV/RX_DATA/RX_D[3:0] valid after rising
edge of RX_CLK
t
Clk
~ 1.44 µs MI_CLK period (f
Clk
≈ 700 kHz)
t
Write
~ 92.16 µs MI Write access time
t
Read
~ 91.44 us MI Read access time
NOTE: For MI timing diagrams refer to Section I.
RX_DV
RX_D[3:0]
RX_ERR
RX_CLK
t RX_setup t RX_hold
RX signals valid
t
RX_CLK
Figure 7: MII timing RX signals