SM320C6472-HIREL Datasheet, PDF (137/264 Pages) Texas Instruments – SM320C6472 Fixed-Point Digital Signal Processor

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SM320C6472-HiRel
SPRS696B – SEPTEMBER 2010 – REVISED OCTOBER 2010
7.6.2 NMI Pin-Generated Interrupts
An NMI interrupt may be asserted to individual C64x+ megamodules from the device pins. The NMI
interrupt is initiated by asserting the NMI input (low), selecting the intended C64x+ megamodule(s) with
the CORESEL[2:0] inputs, and then latching it with the rising LRESETNMIEN input. The NMI interrupt
input must be removed (or de-asserted) from the C64x+ megamodule. This is done by the NMI pin being
latched high by the rising LRESETNMIEN input while selecting the intended C64x+ megamodule with the
CORESEL[2:0] inputs. Therefore, to assert and de-assert NMI, two LRESETNMIEN pulses are required
where the first latches NMI low and the second latches NMI high. Timing requirements for NMI can be
found in Table 7-16 and Figure 7-12.
7.6.3 GPIO Pin-Generated Interrupts
The C6472 device has 16 GPIOs. All GPIOs can be configured to generate interrupts. GPIO0-5 provide
interrupts that are assigned one per core. Interrupts from GPIO6-15 are available to all cores. GPIO0-7
are also provided as event inputs to the EDMA. Timing for the GPIO interrupts can be found in
Table 7-152 and Figure 7-65.
7.6.4 Host and Inter-DSP Interrupts
The C64x+ megamodules can assert an event to a host processor using HOUT. Table 7-11 provides the
timing for the HOUT pulses. The external host or any of the six C64x+ megamodules can generate
interrupts to other C64x+ megamodules. For more details, see Section 3.7.
Table 7-11. Switching Characteristics Over Recommended Operating Conditions for HOUT External
Event ⁽¹⁾
(see Figure 7-7)
500/625/700
NO.
UNIT
MIN
TYP
MAX
1
t_w(HOUTH)
2
t_w(HOUTL)
HOUT pulse duration high
HOUT pulse duration low
24P
ns
24P
ns
(1) P = 1/CPU clock frequency in nanoseconds (ns).
HOUT
(output)
1
2
Figure 7-7. HOUT External Event
Copyright © 2010, Texas Instruments Incorporated
C64x+ Peripheral Information and Electrical Specifications 137
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