CD00237391 Datasheet, PDF (113/177 Pages) STMicroelectronics – ARM-based 32-bit MCU, 150DMIPs, up to 1 MB Flash/128+4KB RAM

STM32F20xxx
Electrical characteristics
Figure 46. Ethernet SMI timing diagram
ETH_MDC
ETH_MDIO(O)
ETH_MDIO(I)
tMDC
td(MDIO)
tsu(MDIO)
th(MDIO)
Table 61. Dynamics characteristics: Ethernet MAC signals for SMI
Symbol
Rating
Min
Typ
Max
t_MDC
MDC cycle time (2.38 MHz)
t_d(MDIO) MDIO write data valid time
t_su(MDIO) Read data setup time
t_h(MDIO) Read data hold time
411
420
425
6
10
13
12
-
-
0
-
-
ai15666d
Unit
ns
ns
ns
ns
Table 62 gives the list of Ethernet MAC signals for the RMII and Figure 47 shows the
corresponding timing diagram.
Figure 47. Ethernet RMII timing diagram
RMII_REF_CLK
RMII_TX_EN
RMII_TXD[1:0]
t_su(RXD)
t_su(CRS)
RMII_RXD[1:0]
RMII_CRS_DV
t_d(TXEN)
t_d(TXD)
t_ih(RXD)
t_ih(CRS)
ai15667
Table 62. Dynamics characteristics: Ethernet MAC signals for RMII
Symbol
Rating
Min
Typ
Max
t_su(RXD)
t_ih(RXD)
t_su(CRS)
t_ih(CRS)
t_d(TXEN)
t_d(TXD)
Receive data setup time
Receive data hold time
Carrier sense set-up time
Carrier sense hold time
Transmit enable valid delay time
Transmit data valid delay time
1
-
-
1.5
-
-
0
-
-
2
-
-
9
11
13
9
11.5
14
Unit
ns
Doc ID 15818 Rev 9
113/177