Ti c66x DSP system events and Its Application-5.7 (IST)

When the CPU starts to process an interrupt (int4 ~ 15), it will reference the interrupt service table (IST ). Ist is a table that obtains the package containing the interrupted service code. The ist contains 16 consecutive packages. Each ISFP contains up to 14 commands (8 32bit nonheader-based commands or 14Header-basedCommand ). OneSimpleThe interrupt service program can be put into an independent get package (that is, there is no need to jump to ISR, 14 instructions are enough). If an ISFP is insufficient to accommodate ISR, you need to set the jump command in ISFP to redirect to ISR.

Indicates the address and content of the IST. Each get package contains 32-bit commands (32 bytes ). Each ISFP address is increased by 32 bytes (20 h. InThe starting address (ISTP) of the in-use ist can be set on the starting address of the L2 memory. Each ISFP can also be called a vector. The right figure shows the list of cpu3, the starting address of L2 in cpu3 is 0x12800000 (the same physical address as 0x00800000 in cpu3 ).