Hardware Documentation efus™A9X+ efus™A9Xr2
| 24
4.14 MISC
10
V33-Enable
3.3V/100mA Vout, use as enable for main board 3.3V
regulator if more current is required
11
ACOK
USB OTG charge detect, future use
12
!RESET_IN
3.3V 100k pull-up on module drives with OC/OD to GND.
Leave open if not used.
14
!RESET_OUT
4.7k pull down, active low reset for baseboard logic
25
PWM_A
3.3V TTL level PWM output
5
Flash
5.1 NAND Flash
By default, boot mode of efusA9 is configured for NAND boot.
efusA9X implements the following to get reliable boot over long time:
Use of SLC NAND flash memory
Boot loader stored two times in flash memory
Flash data protected by 32 bit ECC
Algorithm for block refresh
Operating system Linux uses UBI as file system
Operating system Windows can use F3S to be robust against power failures
5.2 eMMC
If mounted a eMMC v4.41 or higher with 4GB or more is mounted from several manufacturer.
This component is optional and not mounted in all configurations. Please contact sales to get
more information.
If eMMC is mounted, SD_A port is not available on goldfinger.
The eMMC Flash is based on “multi level cell” (MLC) technology. This technology has limited
erase cycles and data retention depends on temperature. It is important to know, that high
temperature impacts data retention of SLC or MLC flash. Independent if the device is powered
or not. Please contact us, if your device is constantly in an environment where temperature is
higher than 50°C.
5.3 SPI NOR Flash
This device can be used for booting. Means you can store boot-loader and boot from this
memory. Because selection of boot-medium is done with eFuse you have to order the efusA9
with the desired boot mode.
This component is optional and not mounted in all configurations. Please contact sales to get
more information.
