pnx1500 NXP Semiconductors, pnx1500 Datasheet - Page 816

• Manufacturer Part Number: pnx1500
• Description: Pnx15xx Series Connected Media Processor
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Volume 1 of 1
PNX15XX_SER_3
Product data sheet
Figure 7:
AD31
msb
P2.g P2.B
P2.g P2.B
P1.R
P1.R
A+3
A+3
Big-Endian External CPU Drawing Two RGB-565 Pixels
A
A
P1.G
P1.G
P2.R P1.g
P2.R P1.g
A+2
A+1
A+1
A+2
P1.B
P1.B
Note that the Power Macintosh architecture contains a PCI bridge that maintains byte
address invariance. Since all stages inside the PNX15xx Series maintain byte
addresses, the end-to-end result of the complex sequence of actions is a successfully
rendered pair of RGB565 pixels.
It is recommended to use only external big-endian CPU/PCI bridge combinations that
implement the Power Macintosh style byte-invariant address model with the PNX15xx
Series. Some external CPU PCI bridges may only contain a static, transaction-size
CPU unaware swapper. The use of such external components is not recommended
and will require special care in software.
P1.g P1.B
P1.g P1.B
P1.g P1.B
P2.R
P2.R
P1.R
A+1
A+2
A+2
A+1
A+1
A
P2.G
P2.G
P1.G
P1.R P1.g
P1.R P1.g
P1.R P1.g
A+3
A+3
A+1
A
A
A
P2.B
P2.B
P1.B
Rev. 3 — 17 March 2006
lsb
AD00
PowerPC CPU data byte address association
‘GIB Endian’ RGB565 transport across PCI bus, as described in
PCI Multimedia Design Guide, Revision 1.0
Data byte address association
“g”represents partial bits from the “G” pixel
PowerPC CPU Register content create by software
‘swap’ as performed by Power Mac PCI bridge
(for 32-bit CPU store operations)
Big-Endian View of resulting SDRAM content
32 lsbits (or msbits) of 64-bit QVCP read across MTL Bus
Data byte address association
Data byte address association
QVCP view after unit unpack
Data byte address association
QVCP view after big-endian mode swap
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
PNX15xx Series
Chapter 29: Endian Mode
29-16