ADSP-BF531/ADSP-BF532/ADSP-BF533
Each event type has an associated register to hold the return
address and an associated return-from-event instruction. When
an event is triggered, the state of the processor is saved on the
supervisor stack.
The ADSP-BF531/ADSP-BF532/ADSP-BF533 processor event
controller consists of two stages, the core event controller (CEC)
and the system interrupt controller (SIC). The core event con
troller works with the system interrupt controller to prioritize
and control all system events. Conceptually, interrupts from the
peripherals enter into the SIC, and are then routed directly into
the general-purpose interrupts of the CEC.
Table 3. System Interrupt Controller (SIC)
Peripheral Interrupt Event
PLL Wakeup
DMA Error
PPI Error
SPORT 0 Error
SPORT 1 Error
SPI Error
UART Error
Real-Time Clock
DMA Channel 0 (PPI)
DMA Channel 1 (SPORT 0 Receive)
DMA Channel 2 (SPORT 0 Transmit)
DMA Channel 3 (SPORT 1 Receive)
DMA Channel 4 (SPORT 1 Transmit)
DMA Channel 5 (SPI)
DMA Channel 6 (UART Receive)
DMA Channel 7 (UART Transmit)
Timer 0
Timer 1
Timer 2
Port F GPIO Interrupt A
Port F GPIO Interrupt B
Memory DMA Stream 0
Memory DMA Stream 1
Software Watchdog Timer
Default Mapping
IVG7
IVG7
IVG7
IVG7
IVG7
IVG7
IVG7
IVG8
IVG8
IVG9
IVG9
IVG9
IVG9
IVG10
IVG10
IVG10
IVG11
IVG11
IVG11
IVG12
IVG12
IVG13
IVG13
IVG13
Core Event Controller (CEC)
The CEC supports nine general-purpose interrupts (IVG15–7),
in addition to the dedicated interrupt and exception events. Of
these general-purpose interrupts, the two lowest priority inter
rupts (IVG15–14) are recommended to be reserved for software
interrupt handlers, leaving seven prioritized interrupt inputs to
support the peripherals of the processor.
describes the
inputs to the CEC, identifies their names in the event vector
table (EVT), and lists their priorities.
Table 2. Core Event Controller (CEC)
Priority
(0 is Highest)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Event Class
Emulation/Test Control
Reset
Nonmaskable Interrupt
Exception
Reserved
Hardware Error
Core Timer
General Interrupt 7
General Interrupt 8
General Interrupt 9
General Interrupt 10
General Interrupt 11
General Interrupt 12
General Interrupt 13
General Interrupt 14
General Interrupt 15
EVT Entry
EMU
RST
NMI
EVX
IVHW
IVTMR
IVG7
IVG8
IVG9
IVG10
IVG11
IVG12
IVG13
IVG14
IVG15
Event Control
The ADSP-BF531/ADSP-BF532/ADSP-BF533 processor pro
vides the user with a very flexible mechanism to control the
processing of events. In the CEC, three registers are used to
coordinate and control events. Each register is 32 bits wide:
• CEC interrupt latch register (ILAT) – The ILAT register
indicates when events have been latched. The appropriate
bit is set when the processor has latched the event and
cleared when the event has been accepted into the system.
This register is updated automatically by the controller, but
it may also be written to clear (cancel) latched events. This
register may be read while in supervisor mode and may
only be written while in supervisor mode when the corre
sponding IMASK bit is cleared.
• CEC interrupt mask register (IMASK) – The IMASK regis
ter controls the masking and unmasking of individual
events. When a bit is set in the IMASK register, that event is
unmasked and will be processed by the CEC when asserted.
A cleared bit in the IMASK register masks the event,
preventing the processor from servicing the event even
though the event may be latched in the ILAT register. This
register may be read or written while in supervisor mode.
System Interrupt Controller (SIC)
The system interrupt controller provides the mapping and rout
ing of events from the many peripheral interrupt sources to the
prioritized general-purpose interrupt inputs of the CEC.
Although the ADSP-BF531/ADSP-BF532/ADSP-BF533 proces
sor provides a default mapping, the user can alter the mappings
and priorities of interrupt events by writing the appropriate val
ues into the interrupt assignment registers (SIC_IARx).
describes the inputs into the SIC and the default mappings into
the CEC.
Rev. E |
Page 7 of 60 |
July 2007
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