DSPIC33EP64GS708 datasheet(41/484 Pages) MICROCHIP

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DS70005258C-page 41

dsPIC33EPXXXGS70X/80X FAMILY

4.3.5

X AND Y DATA SPACES

The dsPIC33EPXXXGS70X/80X core has two Data

Spaces, X and Y. These Data Spaces can be considered

either separate (for some DSP instructions) or as one

unified linear address range (for MCU instructions). The

Data Spaces are accessed using two Address Genera-

tion Units (AGUs) and separate data paths. This feature

allows certain instructions to concurrently fetch two

words from RAM, thereby enabling efficient execution of

DSP algorithms, such as Finite Impulse Response (FIR)

filtering and Fast Fourier Transform (FFT).

The X Data Space is used by all instructions and

supports all addressing modes. X Data Space has

separate read and write data buses. The X read data

bus is the read data path for all instructions that view

Data Space as combined X and Y address space. It is

also the X data prefetch path for the dual operand DSP

instructions (MAC class).

The Y Data Space is used in concert with the X Data

Space by the MAC class of instructions (CLR, ED,

EDAC, MAC, MOVSAC, MPY, MPY.N and MSC) to provide

two concurrent data read paths.

Both the X and Y Data Spaces support Modulo Address-

ing mode for all instructions, subject to addressing mode

restrictions. Bit-Reversed Addressing mode is only

supported for writes to X Data Space.

All data memory writes, including in DSP instructions,

view Data Space as combined X and Y address space.

The boundary between the X and Y Data Spaces is

device-dependent and is not user-programmable.

4.4

Memory Resources

Many useful resources are provided on the main

product page of the Microchip website for the devices

listed in this data sheet. This product page contains the

latest updates and additional information.

4.4.1

KEY RESOURCES

• “dsPIC33E/PIC24E Program Memory”

(DS70000613) in the “dsPIC33/PIC24 Family

Reference Manual”

• Code Samples

• Application Notes

• Software Libraries

• Webinars

• All Related “dsPIC33/PIC24 Family Reference

Manual” Sections

• Development Tools

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