User manual
Hardware Description
11
Slave 7 DDR2 Port 0
Slave 8 DDR2 Port 1
Slave 9 DDR2 Port 2
Slave 10 DDR2 Port 3
Slave 11 Peripheral Bridge 0
Slave 12 Peripheral Bridge 1
Table5.2.Bus Matrix Slaves
5.5. Advanced Interrupt Controller (AIC)
The core features of the Advanced Interrupt Controller are:
• 128 Internal and External Sources
• 8-level Priority Controller
• Level Sensitive or Edge Triggered
• Programmable Polarity for External Sources
Moreover, all PIO lines can be used to generate a PIO interrupt. However, the PIO lines
can only generate level change interrupts, that is, positive as well as negative edges will
generate an interrupt. The PIO interrupt itself (PIO to AIC line) is usually programmed to
be level-sensitive. Otherwise interrupts will be lost if multiple PIO lines source an interrupt
simultaneously.
On the StampA5D3x FIQ, IRQ and GPIO interrupts are available. The list of peripheral
identifiers, which are used to program the AIC can be found in TableB.1, “Peripheral
Identifiers”
5.6. Battery Backup
The following parts of the AT91SAMA5D3x Processor can be backed-up by a battery:
• RC Oscillator
• Slow Clock Oscillator
• Reset Controller
• Shutdown Controller
• RTC
• General Purpose Backup Registers
• Boot Select Control Register
It is recommended to always use a backup power supply (normally a battery) in order to
speed up the boot-up time and to avoid reset problems.