PNX1700EH,557 NXP Semiconductors, PNX1700EH,557 Datasheet - Page 810
PNX1700EH,557
Manufacturer Part Number
PNX1700EH,557
Description
Manufacturer
NXP Semiconductors
Datasheet
1.PNX1700EH557.pdf
(832 pages)
Specifications of PNX1700EH,557
Operating Temperature (min)
0C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Lead Free Status / RoHS Status
Not Compliant
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Philips Semiconductors
Volume 1 of 1
Table 3: Register Result of a (Signed) Load Instruction
PNX17XX_SER_1
Preliminary data sheet
Memory Content
m[a] = 0xAA; m[a+1] = 0xBB; m[a+2] = 0xCC; m[a+3] = 0xDD
m[a] = 0xAA; m[a+1] = 0xBB; m[a+2] = 0xCC; m[a+3] = 0xDD
m[a] = 0xAA; m[a+1] = 0xBB; m[a+2] = 0xCC; m[a+3] = 0xDD
m[a] = 0xAA; m[a+1] = 0xBB; m[a+2] = 0xCC; m[a+3] = 0xDD
m[a] = 0xAA; m[a+1] = 0xBB; m[a+2] = 0xCC; m[a+3] = 0xDD
m[a] = 0xAA; m[a+1] = 0xBB; m[a+2] = 0xCC; m[a+3] = 0xDD
Figure 4:
int w = 0x04050607;
char *a = (char *)&w;
Memory Content Created by the C Program
3.2 Law 2: The “DMA Convention Rule”
An interesting example is the small C program below that determines whether the
program runs on a big-endian or little-endian mode machine.
The DMA convention rule says that “when a stream of items enters the system, items
should be placed in memory such that an item that arrived later has a higher address
value.” On output, a similar convention holds—items sent first are those with the
lowest addresses.
A variant of this rule relates to the storage of images. Pixels from left to right have
increasing addresses. Lines from top to bottom have increasing addresses.
This is a convention that keeps programmers sane. It may also be seen as arbitrary,
but obviously the best choice between two alternatives.
A more precise version of this rule is:
If item ’0’ of a DMA item stream is placed at address “A,” item “i” of a DMA stream
should be placed at byte address “A+i*s,” where “s” is the item size in bytes.
For an example of this rule, refer to
int w = 0x04050607;
char *a = (char *) &w;
if (*a == 0x04) printf("big-endian"); else printf("little-endian");
Big-Endian Mode Memory Content
a+0
04
a+1
05
31
CPU Register Content
04
Rev. 1 — 17 March 2006
a+2
06
05
a+3
07
06
Endian
Mode
little
little
little
big
big
big
Section 5.
a+3
04
07
Little-Endian Mode Memory Content
Data Size
8 bits
16 bits
32 bits
8 bits
16 bits
32 bits
0
a+2
05
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
PNX17xx Series
Chapter 29: Endian Mode
Register Value Result of
Load
0xFFFFFFAA
0xFFFFBBAA
0xDDCCBBAA
0xFFFFFFAA
0xFFFFAABB
0xAABBCCDD
a+1
06
size
(address a)
a+0
07
29-6
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