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TMS320C6678

Multicore Fixed and Floating-Point Digital Signal Processor

3.3.9 Boot Complete (BOOTCOMPLETE) Register

The BOOTCOMPLETE register controls the BOOTCOMPLETE pin status. The purpose is to indicate the completion of the ROM booting process. The Boot Complete Register is shown in Figure 3-8 and described in Table 3-10.

Figure 3-8 Boot Complete Register (BOOTCOMPLETE)

The BCx bit indicates the boot complete status of the corresponding core. All BCx bits will be sticky bits — that is they can be set only once by the software after device reset and they will be cleared to 0 on all device resets.

Boot ROM code will be implemented such that each core will set its corresponding BCx bit immediately before branching to the predefined location in memory.

TMS320C6678

Multicore Fixed and Floating-Point Digital Signal Processor

3.3.10 Power State Control (PWRSTATECTL) Register

The PWRSTATECTL register is controlled by the software to indicate the power-saving mode. ROM code reads this register to differentiate between the various power saving modes. This register is cleared only by POR and will survive all other device resets. See the Hardware Design Guide for KeyStone Devices in ‘‘Related Documentation from Texas Instruments’’ on page 59 for more information. The Power State Control Register is shown in Figure 3-9 and described in Table 3-11.

Figure 3-9 Power State Control Register (PWRSTATECTL)

3.3.11 NMI Even Generation to CorePac (NMIGRx) Register

NMIGRx registers are used for generating NMI events to the corresponding CorePac. The C6678 has

eight NMIGRx registers (NMIGR0 through NMIGR7). The NMIGR0 register generates an NMI event to CorePac0, the NMIGR1 register generates an NMI event to CorePac1, and so on. Writing a 1 to the NMIG field generates a NMI pulse. Writing a 0 has no effect and Reads return 0 and have no other effect. The NMI Even Generation to CorePac Register is shown in Figure 3-10 and described in Table 3-12.

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Writes:

0 = No effect

1 = Creates NMI pulse to the corresponding CorePac — CorePac0 for NMIGR0, etc.

End of Table 3-12

3.3.12 IPC Generation (IPCGRx) Registers

IPCGRx are the IPC interrupt generation registers to facilitate inter CorePac interrupts.

The C6678 has eight IPCGRx registers (IPCGR0 through IPCGR7) registers. This can be used by external hosts or CorePacs to generate interrupts to other CorePacs. A write of 1 to IPCG field of IPCGRx register will generate an interrupt pulse to CorePacx (0 <= x <= 7).

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 given 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 Generation Register is shown in Figure 3-11 and described in Table 3-13.

Figure 3-11 IPC Generation Registers (IPCGRx)

End of Table 3-13

3.3.13 IPC Acknowledgement (IPCARx) Registers

IPCARx are the IPC interrupt-acknowledgement registers to facilitate inter-CorePac core interrupts.

TMS320C6678

Multicore Fixed and Floating-Point Digital Signal Processor

The C6678 has eight IPCARx (IPCAR0 through IPCAR7) registers. 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 given 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 3-12 and described in Table 3-14.

Figure 3-12 IPC Acknowledgement Registers (IPCARx)

3.3.14 IPC Generation Host (IPCGRH) Register

IPCGRH register is provided to facilitate host DSP interrupt. Operation and use of IPCGRH is the same as other IPCGR registers. Interrupt output pulse created by IPCGRH is driven on a device pin, host interrupt/event output (HOUT).

The host interrupt output pulse should be stretched. It should be asserted for 4 bootcfg clock cycles (DSP/6) followed by a deassertion of 4 bootcfg clock cycles. Generating the pulse will result in 8 DSP/6 cycle pulse blocking window. Write to IPCGRH with IPCG bit (bit 0) set will only generate a pulse if they are beyond 8 DSP/6 cycle period. The IPC Generation Host Register is shown in Figure 3-13 and described in Table 3-15.

Figure 3-13 IPC Generation Registers (IPCGRH)

Legend: R = Read only; RW = Read/Write; -n = value after reset

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