User manual

AM335xStarterKitHardwareUsersGuide

• Note: The Starter Kit EVM PCB does not support external delay for the clock signals on the RGMII interface. The

AR8031A PHY can be setup to use internal clock delay mode once booting is complete. Therefore there may be

problems in function/performance when booting in Gb mode or when running Gb Ethernet Mode before the

AR8031A PHY is configured properly. See the Starter Kit Errata.

For both the PHYs, mode selection pins MODE [3:0] are set as “0000” to operate it in 1000 BASE-T, RGMII mode.

The PHY address for the EMAC1-PHY and EMAC2-PHY are 00100 and 00101 respectively.The interrupts from the

both PHYs are connected to both the Non Maskable Interrupt pin and to the processor GPIO pins.

The Wake On LAN interrupts from the both PHYs are connected to the EXT_WAKEUP signal of the processor as

an option.

Pin No Signal Name Description

1 DGND Ground

2 NC No connect

3 ETHER_D3P MDI 3 POSITIVE

4 ETHER_D3N MDI 3 NEGATIVE

5 ETHER_D2P MDI 2 POSITIVE

6 ETHER_D2N MDI 2 NEGATIVE

7 ETHER_D1P MDI 1 POSITIVE

8 ETHER_D1N MDI 1 NEGATIVE

9 ETHER_D0P MDI 0 POSITIVE

10 ETHER_D0N MDI 0 NEGATIVE

D1 PHY_ LED_ACTn PHY ACTIVITY LED signal

D2 GND Ground

D3 GND Ground

D4 PHY_ LED_1000n 1000 Base-T LINK LED signal

Table 5: 10/100/1000 Ethernet1 Pin Details

USB

USB to UART/JTAG

Micro AB USB port is provided as an upstream port of the USB HUB USB2412. This is used for USB to JTAG and

USB to UART conversion applications through the downstream port 1 of the HUB. FT2232L is used for the USB to

UART and JTAG conversion applications. The Downstream port 2 of the Hub is connected to USB port 0 of the

AM335x.

The USB to UART/JTAG converter (FT2232L) has 32 configurable multifunction pins. A 16 bit, serial EEPROM

93LC56B from MicroChip is used to store the configuration data. Some of the pins from ADBUS [7:0] and ACBUS

[7:0] are configured as JTAG and Reset signals. These JTAG pins from the FT2232 IC are connected to the

dedicated processor JTAG pins and as well to the optional JTAG connector.

The Micro AB USB pin out details are provided below.