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MSC8113 Reference Manual, Rev. 0
17-8
Freescale Semiconductor
Interrupt Processing
supports Dual-Edge mode, which may detect a second virtual interrupt while the first one is not
yet serviced.
17.1.1.4 Virtual NMI Generation
The GIC Virtual
NMI
System generates three
NMI
signals, with one
NMI
to each SC140 core.
NMI
is
generated by a write access of each SC140 core or by external host CPU. The Virtual
NMI
goes to
the PIC (
NMI0
). The Virtual
NMI
System does not have a status register; the status register is in the
PIC (see the discussion of the IPRB register on page 17-44).
17.1.1.5 GIC Stop Mode
To put the GIC into Low-Power Stop mode, assert the SCR[GIC_STC] bit in the IPBus master.
The GIC has two conditions for entering Low-Power Stop mode:
IPBus Master block asserts the GIC stop request line.
Both GCIER and GEIER disable all interrupts (hold zero).
When these conditions are both met, the GIC responds with a stop acknowledgment and shuts
down most of its internal clocks, as described in the following paragraphs.
The GIC has the following functionality in Low-Power Stop mode:
Registers. GCIER, GEIER and GISR are write protected. All the rest of the registers are
accessible for both read and write. The GISR read value is meaningless.
Regular Interrupts. No new regular interrupts are captured. Output interrupt lines to the
SC140 cores and
INT_OUT
are deasserted.
Virtual interrupts. You can generate virtual interrupts to all the cores as in normal mode.
VISR can be used to monitor and/or clear the pending status bits. Virtual interrupt sources
24, 16, 8, and 0 are not captured in GISR and do not assert
INT_OUT
.
Regular NMIs. Internal and external
NMI
sources are handled the same way as in normal
mode.
Virtual
NMI
s. You can generate virtual
NMI
s to all the SC140 cores as in normal mode.
The following sequence is required for a smooth exit from GIC Low-Power Stop mode:
Deassert GIC stop request by clearing SCR[GIC_STC] in the IPBus master.
Clear all pending interrupts in the GISR by writing 0xFFFFFFFF to the register.
Re-enable interrupt sources in GEIER or GCIER as required.
Summary of Contents for MSC8113
Page 1: ...MSC8113 Reference Manual Tri Core 16 Bit Digital Signal Processor MSC8113RM Rev 0 May 2008 ...
Page 20: ...MSC8113 Reference Manual Rev 0 xx Freescale Semiconductor Contents ...
Page 28: ...MSC8113 Reference Manual Rev 0 xxviii Freescale Semiconductor ...
Page 56: ...MSC8113 Reference Manual Rev 0 1 28 Freescale Semiconductor MSC8113 Overview ...
Page 76: ...MSC8113 Reference Manual Rev 0 2 20 Freescale Semiconductor SC140 Core Overview ...
Page 134: ...MSC8113 Reference Manual Rev 0 4 30 Freescale Semiconductor System Interface Unit SIU ...
Page 168: ...MSC8113 Reference Manual Rev 0 6 18 Freescale Semiconductor Boot Program ...
Page 180: ...MSC8113 Reference Manual Rev 0 7 12 Freescale Semiconductor Clocks ...
Page 260: ...MSC8113 Reference Manual Rev 0 8 80 Freescale Semiconductor Memory Map ...
Page 300: ...MSC8113 Reference Manual Rev 0 9 40 Freescale Semiconductor Extended Core ...
Page 304: ...MSC8113 Reference Manual Rev 0 10 4 Freescale Semiconductor MQBus and M2 Memory ...
Page 308: ...MSC8113 Reference Manual Rev 0 11 4 Freescale Semiconductor SQBus ...
Page 590: ...MSC8113 Reference Manual Rev 0 17 46 Freescale Semiconductor Interrupt Processing ...
Page 614: ...MSC8113 Reference Manual Rev 0 18 24 Freescale Semiconductor Debugging ...
Page 622: ...MSC8113 Reference Manual Rev 0 19 8 Freescale Semiconductor Internal Peripheral Bus IPBus ...
Page 724: ...MSC8113 Reference Manual Rev 0 21 32 Freescale Semiconductor UART ...
Page 920: ...MSC8113 Reference Manual Rev 0 25 150 Freescale Semiconductor Ethernet Controller ...
Page 1171: ...MSC8113 Reference Manual Rev 0 Freescale Semiconductor C 61 EF wait_rts P 01077FFC 9F rts 71 ...
Page 1172: ...MSC8113 Reference Manual Rev 0 C 62 Freescale Semiconductor MSC8113 Boot Code ...
Page 1202: ...MSC8113 Reference Manual Rev 0 Index 30 Freescale Semiconductor Index ...