TMS320C6678
Multicore Fixed and Floating-Point Digital Signal Processor
SPRS691D—April 2013
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3.3.14 IPC Acknowledgement (IPCARx) Registers
IPCARx are the IPC interrupt-acknowledgement registers to facilitate inter-CorePac core interrupts.
The C6678 has eight IPCARx registers (IPCAR0 through IPCAR7). These registers also provide a Source ID facility
by which up to 28 different sources of interrupts can be identified. Allocation of source bits to source processor and
meaning is entirely based on software convention. The register field descriptions are shown in the following tables.
Virtually anything can be a source for these registers as this is completely controlled by software. Any master that
has access to BOOTCFG module space can write to these registers. The IPC Acknowledgement Register is shown in
Figure 3-13 and described in Table 3-15.
Figure 3-13
IPC Acknowledgement Registers (IPCARx)
31
30
29
28
27
8
7
6
5
4
3
0
SRCC27 SRCC26 SRCC25 SRCC24
RW +0 RW +0 RW +0 RW +0
SRCC23 – SRCC4
SRCC3
RW +0
SRCC2
RW +0
SRCC1
RW +0
SRCC0
RW +0
Reserved
R, +0000
RW +0 (per bit field)
Legend: R = Read only; RW = Read/Write; -n = value after reset
Table 3-15
IPC Acknowledgement Registers (IPCARx) Field Descriptions
Bit
Field
SRCCx
Description
31-4
Interrupt source acknowledgement.
Reads return current value of internal register bit.
Writes:
0 = No effect
1 = Clears both SRCCx and the corresponding SRCSx
3-0
Reserved
Reserved
End of Table 3-15
3.3.15 IPC Generation Host (IPCGRH) Register
The IPCGRH register facilitates interrupts to external hosts. Operation and use of the IPCGRH register is the same
as for other IPCGR registers. The interrupt output pulse created by the IPCGRH register appears on device pin
HOUT.
The host interrupt output pulse is stretched so that it is asserted for four bootcfg clock (CPU/6) cycles followed by a
deassertion of four bootcfg clock cycles. Generating the pulse results in a pulse-blocking window that is eight
CPU/6-cycles long. Back to back writes to the IPCRGH register with the IPCG bit (bit 0) set, generates only one pulse
if the back-to-back writes to IPCGRH are less than the eight CPU/6 cycle window -- the pulse blocking window. In
order to generate back-to-back pulses, the back-to-back writes to the IPCGRH register must be greater than eight
CPU/6 cycle window. The IPC Generation Host Register is shown in Figure 3-14 and described in Table 3-16.
Figure 3-14
IPC Generation Registers (IPCGRH)
31
30
29
28
27
8
7
6
5
4
3
1
0
SRCS27 SRCS26 SRCS25 SRCS24
RW +0 RW +0 RW +0 RW +0
SRCS23 – SRCS4
SRCS3
RW +0
SRCS2
RW +0
SRCS1
RW +0
SRCS0
RW +0
Reserved
R, +000
IPCG
RW +0
RW +0 (per bit field)
Legend: R = Read only; RW = Read/Write; -n = value after reset
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Device Configuration 89
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