STM32F217IGT6 Datasheet, PDF (160/173 Pages) STMicroelectronics – ARM-based 32-bit MCU, 150DMIPs, up to 1 MB Flash/128+4KB RAM

Application block diagrams
STM32F21xxx
A.6
Ethernet interface solutions
Figure 93. MII mode using a 25 MHz crystal
XTAL
25 MHz
MCU
STM32
Ethernet
MAC 10/100
HCLK(1)
IEEE1588 PTP
Timer
input
TIM2
trigger
Timestamp
comparator
MII_TX_CLK
MII_TX_EN
MII_TXD[3:0]
MII_CRS
MII_COL
MII_RX_CLK
MII_RXD[3:0]
MII_RX_DV
MII_RX_ER
MDIO
MDC
PPS_OUT(2)
Ethernet
PHY 10/100
MII
= 15 pins
MII + MDC
= 17 pins
OSC
PLL
HCLK
MCO1/MCO2 ^{PHY_CLK 25 MHz} _XT1
1. f_HCLK must be greater than 25 MHz.
2. Pulse per second when using IEEE1588 PTP optional signal.
Figure 94. RMII with a 50 MHz oscillator
STM32
MCU
HCLK(1)
Ethernet
MAC 10/100
IEEE1588 PTP
Timer
input
TIM2
trigger
Timestamp
comparator
RMII_TX_EN
RMII_TXD[1:0]
RMII_RXD[1:0]
RMII_CRX_DV
RMII_REF_CLK
MDIO
MDC
MS19968V1
Ethernet
PHY 10/100
RMII
= 7 pins
RMII + MDC
= 9 pins
XTAL
/2 or /20
2.5 or 25 MHz _synchronous 50 MHz
OSC
PLL
HCLK
OSC
50 MHz
1. f_HCLK must be greater than 25 MHz.
50MHz _XT1
50 MHz
MS19971V1
160/173
Doc ID 17050 Rev 8