Datasheet

Ethernet
FRDM-K64F Freedom Module User’s Guide, User's Guide, Rev. 1, 08/2016
12 NXP Semiconductors
Table 4. Micro SD card socket connection
Pin
Function
TWR-K64120M connection
4
VDD
3.3 V board supply (V_BRD)
5
CLK
PTE2/LLWU_P1/ADC0_DP2/ADC1_SE6A/SPI1_SCK/UART1_CTS/SDHC0_DCLK/TRACE
_D2
6
VSS
Ground
7
DAT0
PTE1/LLWU_P0/ADC1_SE5A/SPI1_SOUT/UART1_RX/SDHC0_D0/TRACE_D3/I2C1_S
CL/SPI1_ SIN
8
DAT1
PTE0/ADC1_SE4A/SPI1_PCS1/UART1_TX/SDHC0_D1/TRACE_CLKOUT/I2C1_SDA/RT
C_CLKO UT
G1
SWITCH
PTE6/SPI1_PCS3/UART3_CTS_b/I2S0_MCLK/FTM3_CH1/USB0_SOF_OUT
S1-S4
S1, S2, S3, S4
Shield ground
8. Ethernet
The MK64FN1M0VLL12 MCU features a 10/100 MB/s Ethernet MAC with MII and RMII interfaces.
The FRDM-K64F board routes RMII interface signals from the K64 MCU to the onboard Micrel 32-pin
Ethernet PHY.
When the K64 Ethernet MAC is operating in RMII mode, synchronization of MCU clock and 50 MHz
RMII transfer clock is important. The MCU input clock must be kept in phase with external PHY. The
32-pin Micrel Ethernet PHY has the ability to provide 50 MHz clock to MK64FN1M0VLL12 MCU
EXTAL0 and Ethernet PHY itself.
Figure 12. RMII to Ethernet PHY
No external pullup is available on MDIO signal when MK64FN1M0VLL12 MCU is requests status of
the Ethernet link connection. Internal pullup is required when port configuration for MDIO signal is
enabled.