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DIMM.AM335x (Rev3) 12/24

The control signals and the lower 4 data lines of interface MMC2 are routed to the SDC1 interface of

the SODIMM connector. Since the interface SDC2 of the SODIMM connector is unused the upper 4

data lines of the MMC2 interface are routed its data pins.

An SDC socket with 4 data pins can be directly connected at the SDC1 interface. If an interface like

MMCplus with 8 data lines shall be realized the upper 4 data bits can be taken from the SDC2

interface.

The write protect input SDC1_WP of the SDC interface is connected to GPIO pin GPIO1_26 of the

processor. The card detect input SDC1_CD# is connected to GPIO pin GPIO1_27 of the processor.

3.13 Serial Ports

The processor AM335x incorporates 6 TL16C750 compatible UARTs. The TL16C750 has 64 Byte

FIFOs. The baud rates are generated internally by dividing a 48 MHz input clock.

The signals of 4 UARTs are available at the SODIMM connector.

UART0 is used as terminal interface and the signals are connected by an RS232 transceiver like

MAX3221E is to UART0 on the DIMM module.

The signals of UART1, UART3 and UART4 are connected directly as LVTTL signals to the SODIMM

connector. The modem control signals RTS and CTS of UART3 are connected to the pins of UARTE.

UART1 provides all 6 modem control signals. They are routed to the GPIO[9:4] pins of the SODIMM

connector.

SODIMM interface

AM335x interface

Signal level

UART_A

UART0, TxD, RxD, RTS and CTS

RS232

UART_B

UART1, with all modem control

signals at GPIO[9:4]

LVTTL

UART_C

UART4, TxD and RxD

LVTTL

UART_D

UART3, TxD and RxD

LVTTL

UART_E

UART3, RTS and CTS

LVTTL

3.14 I²C- Bus

The I²C bus interface I2C0 of the processor AM335x is used on the module DIMM-335x. It supports

baud rates from 100 Kbits/s up to 3.4 Mb/s. 32 byte FIFOs are incorporated to buffer transmit and

receive telegrams.

The PMIC TPS65910A3 and the RTC RX-8025 are connected to the I²C bus on the module. The PMIC

uses the two 7-bit addresses, 0x2D and 0x12. The RTC uses the address 0x32.

The I²C bus is available at the SODIMM connector for external devices. The SCL and SDA lines are

pulled up to 3.3V with 2.2 k resistors.

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 23 24

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Epson Powerspan Manuale Utente Pagina 12

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