OMAP-L137
SPRS563G – SEPTEMBER 2008 – REVISED JUNE 2014
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6.7.1.3
AINTC Hardware Interrupt Nesting Support
Interrupt nesting occurs when an interrupt service routine re-enables interrupts, to allow the CPU to
interrupt the ISR if a higher priority event occurs. The AINTC provides hardware support to facilitate
interrupt nesting. It supports both global and per host interrupt (FIQ and IRQ in this case) automatic
nesting. If enabled, the AINTC will automatically update an internal nesting register that temporarily masks
interrupts at and below the priority of the current interrupt channel. Then if the ISR re-enables interrupts;
only higher priority channels will be able to interrupt it. The nesting level is restored by the ISR by writing
to the nesting level register on completion. Support for nesting can be enabled/disabled by software, with
the option of automatic nesting on a global or per host interrupt basis; or manual nesting.
6.7.1.4
AINTC System Interrupt Assignments on OMAP-L137
System Interrupt assignments for the OMAP-L137 are listed in
Table 6-6
Table 6-6. AINTC System Interrupt Assignments
SYSTEM INTERRUPT
INTERRUPT NAME
SOURCE
0
COMMTX
ARM
1
COMMRX
ARM
2
NINT
ARM
3
PRU_EVTOUT0
PRUSS Interrupt
4
PRU_EVTOUT1
PRUSS Interrupt
5
PRU_EVTOUT2
PRUSS Interrupt
6
PRU_EVTOUT3
PRUSS Interrupt
7
PRU_EVTOUT4
PRUSS Interrupt
8
PRU_EVTOUT5
PRUSS Interrupt
9
PRU_EVTOUT6
PRUSS Interrupt
10
PRU_EVTOUT7
PRUSS Interrupt
11
EDMA3_CC0_CCINT
EDMA Channel Controller Region 0
12
EDMA3_CC0_CCERRINT
EDMA Channel Controller
13
EDMA3_TC0_TCERRINT
EDMA Transfer Controller 0
14
EMIFA_INT
EMIFA
15
IIC0_INT
I2C0
16
MMCSD_INT0
MMCSD
17
MMCSD_INT1
MMCSD
18
PSC0_ALLINT
PSC0
19
RTC_IRQS[1:0]
RTC
20
SPI0_INT
SPI0
21
T64P0_TINT12
Timer64P0 Interrupt 12
22
T64P0_TINT34
Timer64P0 Interrupt 34
23
T64P1_TINT12
Timer64P1 Interrupt 12
24
T64P1_TINT34
Timer64P1 Interrupt 34
25
UART0_INT
UART0
26
-
Reserved
27
MPU_BOOTCFG_ERR
Shared MPU and SYSCFG Address/Protection Error
Interrupt
28
SYSCFG_CHIPINT0
SYSCFG CHIPSIG Register
29
SYSCFG_CHIPINT1
SYSCFG CHIPSIG Register
30
SYSCFG_CHIPINT2
SYSCFG CHIPSIG Register
31
SYSCFG_CHIPINT3
SYSCFG CHIPSIG Register
32
EDMA3_TC1_TCERRINT
EDMA Transfer Controller 1
33
EMAC_C0RXTHRESH
EMAC - Core 0 Receive Threshold Interrupt
68
Peripheral Information and Electrical Specifications
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