Installation Instructions

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Contribution to Technology · ZLG Electronics

A6G2C Series Core Board

MiniARM Core Board

Product Data Manual

Table 3.10 SPI4

Pin number

Chip corresponding pin

Default firmware

function

Reusable function

Remarks

A12

ENET2_TX_DATA1

ENET2_TXD1

SPI4_SCK

The SPI4 supports a

maximum of one chip

select. The

SPI4_SS1/2/3 have

been used by Nand

Flash signal cables

A16

ENET2_TX_EN

ENET2_TXEN

SPI4_MOSI

A18

ENET2_TX_CLK

SPI4_MISO

A10

ENET2_RX_ER

ENET2_RXER

SPI4_SS0

Note 1: All A6G2C core boards support this SPI4 interface.

Note 2: The A6G2C core board cannot multiplex the yellow ENET signal, but can be multiplexed into the

SPI4 signal.

Note 3: The SPI4 is not the default function of the firmware, and it is in a multiplexing relationship with the

ENET2 interface. It should be allocated reasonably before use.

3.5.2 uSDHC

The A6G2C series core board supports one Ultra Secured Digital Host Controller (uSDHC), which provides

a corresponding interface for the communication between the system and SD/SDIO/MMC card. The uSDHC has

the following features:

 Compatible with SD specification V3.0;

 Compatible with SDIO specification V3.0;

 Compatible with MMC specification V4.2 / 4.3 / 4.4 / 4.41;

 Card bus clock frequency up to 208 MHz;

 Support the write operation of the write protection switch;

 Support 1-bit and 4-bit SD/SDIO mode, and 1-bit and 4-bit MMC mode.

The A6G2C series core board firmware has one SD interface by default, as shown in the following figure.

Table 3.11 SD1

Pin number

Chip corresponding pin

Default firmware

function

Reusable function

Remarks

A58

UART1_RTS_B

SD1_CD

SD1_CD is the card

inserted

Detection signal, valid

at low level; SD1_WP

is card write protection

detection, high

Active level, low level

Indicates no write

protection

A60

UART1_CTS_B

SD1_WP

A62

SD1_CLK

A64

SD1_CMD

A66

SD1_DATA0

A68

SD1_DATA1

A70

SD1_DATA2

A72

SD1_DATA3

Note 1: This SD interface is the default configuration of the system factory firmware.

3.5.3 UART

The universal asynchronous receiver/transmitter (UART) can use the RS-232 communication cable to realize

serial communication with external equipment by using the level converter; or by using an external circuit that

converts infrared signals into electrical signals (for reception), or low-speed IrDA communication is achieved by

an external circuit that converts the signal to drive the infrared LED (for transmission). The UART supports NRZ