
Philips Semiconductors
PNX15xx Series
Volume 1 of 1
Chapter 3: System On Chip Resources
PNX15XX_SER_3
Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 3 — 17 March 2006
3-8
3.3 System Module MMIO registers
4.
System Endian Mode
PNX15xx Series supports both big-endian and little-endian modes, allowing it to run
either little-endian or big-endian software, as required by a particular application or
system.
The operating endian mode of the PNX15xx Series system is dened in one unique
location and it is observed by all the modules in the system.
Section 4.1 presents the layout of the system endian mode MMIO register.
Table 2: SYSTEM REGISTERS
Bit
Symbol
Acces
s
Value
Description
System Module Registers
Offset 0x06 3FF4
GLB_REG_POWER_DOWN
31
POWER_DOWN
R/W
0x0000
Power down register for the module
0: Normal operation of the module. This is the reset value.
1: Module is powered down and the module clock can be
removed. At power down, module responds to all reads with
0xDEADABBA (except for reads of powerdown register). Writes
are answered with DCS ERR signal (except for writes to power
down register).
30:0
Unused
-
To ensure software backward compatibility, writes to unused or
reserved bits should be zero and reads must be ignored.
Offset 0x06 3FFC
GLB_REG_MOD _ID
31:16
MODULE_ID
R
0x0126
Unique 16-bit code.
Module ID 0 and -1 are reserved for future use.
0x0126 indicates a the system register module.
15:12
MAJOR_REV
R
0x8
Changed upon functional revision, like new feature added to
previous revision
11:8
MINOR_REV
R
0x1
Changed upon bug x or non functional changes like yield
improvement.
7:0
APERTURE
R
0x0
Encoded as: Aperture size = 4K*(bit_value+1).
The bit value is reset to 0 meaning a 4K aperture for the Global
register 1 module according to the formula above.