DSPIC30F6010 MICROCHIP [Microchip Technology], DSPIC30F6010 Datasheet - Page 25

• Manufacturer Part Number: DSPIC30F6010
• Description: High-Performance Digital Signal Controllers
• Manufacturer: MICROCHIP [Microchip Technology]

FIGURE 3-5:
3.2
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
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.
 2004 Microchip Technology Inc.
Note: PSVPAG is an 8-bit register, containing bits <22:15> of the program space address
BSET
MOV
MOV
MOV
Space
Data
EA
Upper half of Data
Space is mapped
into Program Space
(i.e., it defines the page in program space to which the upper half of data space is being mapped).
Data Address Space
CORCON,#2
#0x00, W0
W0, PSVPAG
0x9200, W0
DATA SPACE MEMORY MAP
16
EA<15> = 0
EA<15> = 1
DATA SPACE WINDOW INTO PROGRAM SPACE OPERATION
15
15
; PSV bit set
; Set PSVPAG register
; Access program memory location
; using a data space access
Data Space
0x8000
15
0xFFFF
0x0000
Preliminary
Concatenation
Address
PSVPAG
0x00
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 Y 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.
8
(1)
23
23
dsPIC30F6010
Program Space
15
Data Read
DS70119D-page 23
0
0x000100
0x017FFE
0x001200