DSPIC30F2010 datasheet(27/236 Pages) MICROCHIP

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DS70150C-page 25

dsPIC30F6010A/6015

FIGURE 3-5:

DATA SPACE WINDOW INTO PROGRAM SPACE OPERATION

3.2

Data Address Space

The core has two data spaces. The data spaces can be

considered either separate (for some DSP instruc-

tions), or as one unified linear address range (for MCU

instructions). The data spaces are accessed using two

Address Generation Units (AGUs) and separate data

paths.

3.2.1

DATA SPACE MEMORY MAP

The data space memory is split into two blocks, X and

Y data space. A key element of this architecture is that

Y space is a subset of X space, and is fully contained

within X space. In order to provide an apparent Linear

Addressing space, X and Y spaces have contiguous

addresses.

When executing any instruction other than one of the

MAC

class of instructions, the X block consists of the

64 Kbyte

data

address

space

(including

all

addresses). When executing one of the MAC class of

instructions, the X block consists of the 64 Kbyte data

address space excluding the Y address block (for data

reads only). In other words, all other instructions regard

the entire data memory as one composite address

space. The MAC class instructions extract the Y

address space from data space and address it using

EAs sourced from W10 and W11. The remaining X data

space is addressed using W8 and W9. Both address

spaces are concurrently accessed only with the MAC

class instructions.

A data space memory map is shown in Figure 3-6.

Figure 3-7 shows a graphical summary of how X and Y

data spaces are accessed for MCU and DSP

instructions.

PSVPAG(1)

EA<15> = 0

EA<15> = 1

Data

Space

Data Space

Program Space

0x0000

0x8000

0xFFFF

0x00

0x017FFE

Data Read

Upper half of Data

Space is mapped

into Program Space

Note: PSVPAG is an 8-bit register, containing bits <22:15> of the program space address

(i.e., it defines the page in program space to which the upper half of data space is being mapped).

0x001200

Address

Concatenation

BSET

CORCON,#2

; PSV bit set

MOV

#0x00, W0

; Set PSVPAG register

MOV

W0, PSVPAG

MOV

0x9200, W0

; Access program memory location

; using a data space access

0x000100

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