It accepts a bit input and can place it anywhere in the bit output field, from off-scale right to off-scale left, in a single cycle. The output of the next address multiplexer is fed back to the PC, which normally reloads it at the end of each processor cycle. The processor synchronizes such signals before recognizing them. The processor must be reset to clear the stack overflow status. Aside from the completion of an instruction requiring multiple cycles, the automatic transfer of individual data words has the highest priority of any operation short of RESET, including all interrupts. A parallel-resonant, fundamental frequency, microprocessor-grade crystal should be used. The SPORT outputs an internally generated transmit framing signal after data is loaded into the transmit TXO or TXl register, at the time needed to ensure continuous data transmission, after the last bit of the current word is transmitted the exact time depends on the framing mode being used; see “Normal and Alternate Framing Modes,” the next section.

There is a single the frame sync signal that occurs only at the start of the first word, either one SCLK before the first bit normal or at the same time as the first bit alternate. Syntax Status Condition True If: Search the history of over billion web pages on the Internet. True if the ALU overflows. The two status registers provide status information to both the host and the ADSP- 21xx core. A bit accumulator provides eight bits of protection against overflow in successive additions to ensure that no loss of data or range occurs; overflows would have to occur before any data is lost. As described earlier, however, there is a delay from when the host writes data to when the status is synchronized to the ADSPxx.

Always select the arithmetic shift for the higher half HI of the twos- complement input or logical for unsigned.


This is true even during a multicycle transfer from the host. These registers are memory mapped in data memory space.

When a JUMP instruction is decoded, the jump address is input directly to the next address mux of the program sequencer. With the automatic post-modify of the DAGs, you could execute the second of these instructions in a loop and continuously advance through the buffer.

The program sequencer in the ADSP family asp looped code with zero overhead, combining excellent performance with adwp clearest program structure. The modified valued stored back after post-update remains in normal order.

The HIP write interrupt vector is location 0x The host polls the HSR bits to see when anv new data is available. Program booting is described in Chapter 10, “Memory Interface. Casel If the last instruction in the loop is not a jump, call, return, or idle, the next address circuit will select the next address based on the termination condition stored on the top of the loop stack. The cse inputs should be ac-coupled.

If the ADSPxx is reading the register that is being overwritten, the result is unpredictable. This read-only path does not use the bus exchange circuit; it is the path shown on the individual computational unit block diagrams.

case study and overview of adsp 21xx processor

The second stage uses the NORM instruction. This mode allows more efficient implementation of bit-specified algorithms that use biased rounding, for example the GSM speech compression routines.

The count register is automatically reloaded from a bit assp register and the count resumes immediately. In non-nesting mode, all interrupt requests are automatically masked out when an interrupt service routine is entered. The rounded output is directed to either MR or MF.

The following table summarizes the MR saturation operation. The framing signal is not checked again until the adps has been transmitted or received. An interrupt is generated when an entire block transfer is complete i. Timer interrupts can be masked, cleared and forced in software if desired.


For linear addressing, the modulus logic is disabled by setting the corresponding L register to zero. The data can also be autobuffered into and from on-chip memory where data is automatically transferred to or from the data stusy.

X input Y input signed x signed unsigned x signed signed x unsigned unsigned x unsigned The input formats are specified as part of the instruction.

case study and overview of adsp 21xx processor

This manual provides the information necessary to understand and evaluate the processors’ architecture, and to determine which device best meets your needs for a particular application. The ogerview registers, which are memory-mapped, are shown in Figure 6. If a bit host writes bit data, the upper byte of the data must be 0x The modulator noise-shapes the signal such that errors inherent to the process are minimized in the passband of the converter.

The SE register is loaded with oveview output of the exponent detector only if SE contains In this case, the second operation will load a value into SE.

Full text of “analogDevices :: ADSP Users Manual 3ed Sep95”

The APWD bits must be cleared to zeros at least three processor cycles before putting the processor in powerdown. This results in shorter booting times for shorter loads. The HIP is made up of proceasor data pins and 11 control pins.