PNX1702EH/G,557 NXP Semiconductors, PNX1702EH/G,557 Datasheet - Page 808
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PNX1702EH/G,557
Manufacturer Part Number
PNX1702EH/G,557
Description
IC MEDIA PROC 500MHZ 456-BGA
Manufacturer
NXP Semiconductors
Datasheet
1.PNX1702EHG557.pdf
(832 pages)
Specifications of PNX1702EH/G,557
Applications
Multimedia
Core Processor
TriMedia
Controller Series
Nexperia
Ram Size
208K x 8
Interface
I²C, 2-Wire Serial
Number Of I /o
61
Voltage - Supply
1.33 V ~ 1.47 V
Operating Temperature
0°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
456-HBGA
Operating Temperature (min)
0C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Program Memory Type
-
Lead Free Status / Rohs Status
Compliant
Other names
935281647557
PNX1702EH/G
PNX1702EH/G
PNX1702EH/G
PNX1702EH/G
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Philips Semiconductors
Volume 1 of 1
3. Endian Mode Theory
PNX17XX_SER_1
Preliminary data sheet
3.1 Law 1: The “CPU Rule”
There are two basic laws of endian mode: one imposed by CPU history, and one by
convention. Both must be met by any system architecture that implements dual-
endian operation capability. In addition, there are some implementation choices for a
system architecture.
Series on-chip buses. These choices are somewhat arbitrary, but they must be
followed to ensure future compatibility.
This section is intended to explain CPU endian modes in detail. For those familiar
with CPUs and endian modes, it is optional reading.
The following summarizes how CPUs and byte-addressable memory operate:
Consider the following example a (hypothetical) C struct:
} DMA_Descriptor;
Remark: This is based on an example in the Apple
Cards and Drivers for Power Macintosh Computers,” Appendix A.
A compiler would assign byte offsets as follows: C:0, F:1, L:2, A:4. This assignment is
independent of system endian mode.
Figure 2
Figure 2:
•
•
•
When storing an “n byte” size item from a CPU register to memory at address “A,”
the bytes modified are always the bytes with byte address “A”..”A+n-1.”
In little-endian mode, the byte at address “A” receives the least significant bits of
the multi-byte item.
In big-endian mode, the byte at address “A” receives the most significant bits.
struct {
UInt8C;//"command" byte
UInt8F;//"flags" byte
UInt16L;//"length" 16 bit value
UInt32A;//"address" 32 bit value
and
0
Big-Endian Layout of DMA_Descriptor
C
Figure 3
1
Rev. 1 — 17 March 2006
Section 6.
F
show the two layout views.
Word 1
2
explains the choices that were made for the PNX17xx
L
4
Word 2
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
publication, ”Designing PCI
PNX17xx Series
Chapter 29: Endian Mode
A
29-4
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