Datasheet
SAM9G20
DS60001516A-page 774 2017 Microchip Technology Inc.
44. Errata
Errata is gathered in two sections:
Section 44.1 “SAM9G20 Errata - Revision A Parts”
Section 44.2 “SAM9G20 Errata - Revision B Parts”
44.1 SAM9G20 Errata - Revision A Parts
44.1.1 Analog-to-digital Converter (ADC)
44.1.1.1 ADC: Sleep Mode
If Sleep mode is activated while there is no activity (no conversion is being performed), it will take effect only after a conversion occurs.
Problem Fix/Workaround
To activate sleep mode as soon as possible, it is recommended to write successively, ADC Mode Register (SLEEP) then ADC Control
Register (START bit field); to start an analog-to-digital conversion, in order put ADC into sleep mode at the end of this conversion.
44.1.2 Boot ROM
44.1.2.1 Boot ROM: ROM Code, Internal RC Usage with SAM-BA Boot through USB
Booting from the internal RC oscillator (OSCSEL = 0) prevents using SAM-BA Boot through the USB device interface.
Problem Fix/Workaround
Use SAM-BA Boot through DBGU (or AT91SAM-ICE JTAG-ICE interface with SAM-BA GUI) if the internal RC oscillator must be used.
Boot from the 32 kHz external oscillator (OSCEL = 1) to use SAM-BA Boot through the USB.
44.1.2.2 Boot ROM: MCCK Remains Active
The ROM boot sequence is as follows:
- DataFlash on SPI0 NPCS0
- DataFlash on SPI0 NPCS1
- NAND FLash
- SDCard
-TWI
- SAM-BA Boot
MCCK is not disabled after SDCard boot program. This does not affect the TWI boot program but must be considered by any applications
using SAM-BA boot.
Problem Fix/Workaround
None.
44.1.3 Error Correction Code Controller (ECC)
44.1.3.1 ECC: 1-bit ECC per 512 Words
1-bit ECC per 512 words is not functional.
Problem Fix/Workaround
Perform the ECC computation by software.
44.1.3.2 ECC: Incomplete parity status when error in ECC parity
When a single correctable error is detected in ECC value, the error is located in ECC Parity register's field which contains a 1 in the 24
least significant bits except when the error is located in the 12th or the 24th bit. In this case these bits are always stuck at 0.
A Single correctable error is detected but it is impossible to correct it.
Problem Fix/Workaround
None.