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Digital Signal Processors (DSP)
C6000 Single Core DSP
C64x Single Core DSP Forum
C6457 SRIO DOORBELL packet
In the TMS320C6457 DSP Serial RapidIO (SRIO) Users Guide SPRUGK4D March 2009-Revised February 2011, on Page 90, Figure 42 RapidIO DOORBELL Packet for Interrupt Use:
The format of the doorbell packet, describes the 16 info bits as: 9 bits Reserved, 2 bits Doorbel Reg #, 1 bit Reserved, and 4 bits Doorbell bit. Here is my question: Can this described operation of the DOORBELL on the C6457 be switched off, so that the info bits can be used for any purpose? or is the chip hard-wired for this operation only?
In the paragraph above Figure 42, it says "The DOORBELL functionality is user-defined. This packet type is commonly used to initiate CPU interrupts."
The TI implementation uses the two defined fields to set status bits in one of 4 Doorbell registers. These can be routed to interrupts, but it is up to you to decide which of those status bits should be routed to which interrupt signal, or to none.
If a status bit of a Doorbell register is not routed to an interrupt, then you can use it any way you want to. The sections following Figure 42 explain how the status and interrupt routing registers work. If you have any questions on those explanations, please let us know.
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