Give priority for a program in mac
- GIVE PRIORITY FOR A PROGRAM IN MAC GENERATOR
- GIVE PRIORITY FOR A PROGRAM IN MAC UPDATE
- GIVE PRIORITY FOR A PROGRAM IN MAC REGISTRATION
- GIVE PRIORITY FOR A PROGRAM IN MAC CODE
- GIVE PRIORITY FOR A PROGRAM IN MAC PC
Levels 0 (lowest level), 1, and 2 are maskable. Interrupts have a flexible priority structure with levels that can range from zero to three.
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The PIC receives all interrupt requests, arbitrates among them, and generates the interrupt vector address. A single-instruction DO loop can be used in place of a REP instruction if interrupts must be allowed.
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Interruptible since they are fetched only once. The instruction to be repeated is only fetched once, so throughput is increased by reducing external bus contention. The repeat (REP) instruction loads the LC with the number of times the next instruction is to be repeated. More information about the LA and LC appears in Section 5.3.4 Instruction Pipeline Format.
GIVE PRIORITY FOR A PROGRAM IN MAC PC
If the LC is equal to one, then the LC, LA, and the loop flag in the SR are restored with the stack contents, while instruction fetches continue at the incremented PC value (LA + 1).
GIVE PRIORITY FOR A PROGRAM IN MAC UPDATE
If LC is not equal to one, then it is decremented, and the SS is read to update the PC with the address of the first instruction in the loop, effectively executing an automatic branch. If the last word was fetched, the LC contents are tested for one. While the loop flag in the SR is asserted, the loop state machine (in the PDC) will compare the PC contents to the contents of the LA to determine if the last instruction word in the loop was fetched. Under control of the PAG, the address of the first instruction in the loop is also stacked so the loop can be repeated with no overhead. The DO instruction also supports nested loops by stacking the contents of the LA, LC, and SR prior to the execution of the instruction. A DO instruction loads the LC register with the number of times the loop should be executed, loads the LA register with the address of the last instruction word in the loop (fetched during one loop pass), and asserts the loop flag in the SR. The PAG provides hardware dedicated to support loops, which are frequent constructs in DSP algorithms. The PAG contains the PC, the SP, the SS, the operating mode register (OMR), the SR, the LC register, and the LA register (see Figure 5-1). The backup instruction latch stores a duplicate of the prefetched instruction to optimize execution of the repeat (REP) and jump (JMP) instructions. The PDC decodes the 24-bit instruction loaded into the instruction latch and generates all signals necessary for pipeline control.
GIVE PRIORITY FOR A PROGRAM IN MAC CODE
The PDC contains the program logic array decoders, the register address bus generator, the loop state machine, the repeat state machine, the condition code generator, the interrupt state machine, the instruction latch, and the backup instruction latch.
GIVE PRIORITY FOR A PROGRAM IN MAC GENERATOR
The PCU consists of three hardware blocks: the program decode controller (PDC), the program address generator (PAG), and the program interrupt controller (PIC). The program control unit implements a three-stage (prefetch, decode, execute) pipeline and controls the five processing states of the DSP: normal, exception, reset, wait, and stop.ĥ.3 PROGRAM CONTROL UNIT (PCU) ARCHITECTURE When they are written, only the appropriate LSBs are significant, and the MSBs are written as don’t care. When they are read, the least significant bits (LSBs) are significant, and the most significant bits (MSBs) are zeroed as appropriate. Although none of the registers are 24 bits, they are read or written over 24-bit buses. The stack pointer (SP) points to the SS locations.Īll of the PCU registers are read/write to facilitate system debugging.
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Each location in the SS is addressable as a 16-bit register, system stack high (SSH) and system stack low (SSL). The SS also stores the LC and LA registers. The SS is a 15-level by 32-bit separate internal memory which stores the PC and SR for subroutine calls, long interrupts, and program looping. In addition to the standard program flow-control resources, such as a program counter (PC), complete status register (SR), and SS, the program control unit features registers (loop address (LA) and loop counter (LC)) dedicated to supporting the hardware DO loop instruction. The programmer sees the program control unit as six registers and a hardware system stack (SS) as shown in Figure 5-1.
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It performs program address generation (instruction prefetch), instruction decoding, hardware DO loop control, and exception (interrupt) processing. The program control unit is one of the three execution units in the central processing module (see Figure 5-2). The instruction pipeline description is also included since understanding the pipeline is particularly important in understanding the DSP56K family of processors. This section describes the hardware of the program control unit (PCU) and concludes with a description of the programming model.
GIVE PRIORITY FOR A PROGRAM IN MAC REGISTRATION
ĥ.4.5.4 Reserved Stack Pointer Registration (Bits 6–23). ĥ.4.2.13 Double Precision Multiply Mode (Bit 14). SECTION 5.3 PROGRAM CONTROL UNIT (PCU) ARCHITECTURE.