PNX1302EH NXP Semiconductors, PNX1302EH Datasheet - Page 211

• Manufacturer Part Number: PNX1302EH
• Manufacturer: NXP Semiconductors

Specifications of PNX1302EH

• Lead Free Status / RoHS Status: Not Compliant

Image Coprocessor
14.1
In this document, the generic PNX1300 name refers
to the PNX1300 Series, or the PNX1300/01/02/11
products.
The Image Coprocessor (ICP) connects to the PNX1300
on-chip data highway to perform SDRAM block read and
write actions. It also connects to the PCI interface to al-
low block write transactions across PCI.
The major functions of the ICP are:
• Filter an image by reading the image from SDRAM
• Filter an image by reading the image from SDRAM
• Filter an image and convert it from planar to RGB or
• Move an image by reading the image from SDRAM
All of the ICP functions move and transform data from
memory to memory or memory to the PCI bus. Hence,
the DSPCPU can use the ICP in a time-sharing fashion
to simultaneously achieve:
1. Vertical and horizontal resizing/subsampling on the
2. Vertical and horizontal resizing/upsampling on the im-
3. Presentation of a collection of live video windows with
1.
and writing the image back to SDRAM, while apply-
ing a user-defined polyphase filter with optional hori-
zontal up- or down-scaling.
and writing the image back to SDRAM, while apply-
ing a user defined polyphase filter with optional verti-
cal up- or down-scaling.
YUV composite by reading the image from SDRAM
and writing the image out to PCI bus memory (graph-
ics card) or SDRAM, while performing horizontal
scaling and conversion to one of a several RGB or
YUV formats. The programmer can add optional bit-
map masking to selectively enable/disable pixel
writes to PCI (to refresh only the exposed part of a
video window) and an optional image overlay with
alpha blending and optional chroma keying (PCI out-
put only).
and writing it back to SDRAM.
image stream from the Video In (VI) unit.
age stream sent to the Video Out (VO) unit.
programmable up and down scaling and arbitrary
overlap configuration on PCI graphics cards.
Note that function 2 and 3 don’t normally occur simulta-
neously, and if an application attempts both simulta-
neously, some performance limitations are incurred.
IMAGE COPROCESSOR OVERVIEW
1
Full 2D scaling and filtering requires two passes over the
data: one for horizontal scaling and filtering and one for
vertical scaling and filtering.
Figure 14-1
the ICP.
nal structure of the ICP. The ICP contains a 5-tap filter,
YUV to RGB converter, an overlay and alpha blending
unit, and an output formatter. These blocks communicate
with each other through FIFOs that also buffer the block
data to and from the PNX1300 Data Highway. The ICP
uses a microprogram-controlled sequencer to control its
internal timing. The program for this sequencer is in a ta-
ble in SDRAM. The ICP reads the appropriate portion
from the SDRAM each time the ICP is commanded to
perform a function. Microprogram control simplifies and
minimizes the ICP hardware and increases the flexibility
of the ICP to perform additional tasks without adding
hardware.
14.2
14.2.1
The major functions of the ICP include:
1. Read an image from SDRAM and write the image
2. Read an image from SDRAM and write the image
3. Read an image from SDRAM and write the image out
14.2.2
ICP bandwidth can be estimated from the worst-case im-
age processing bandwidth. If the worst case image is
1024 x 768 at 30 Hz in YUV 4:2:2 format, the pixel rate is
1024 x 768 x 30 = 23.59 Mpix/sec. For YUV 4:2:2 image
coding at 2 bytes per pixel, this is 23.59 x 2 = 47.19 MB/
PRELIMINARY SPECIFICATION
back to SDRAM, while applying a user defined
polyphase filter with optional up or down scaling in
horizontal direction.
back to SDRAM, while applying a user defined
polyphase filter with optional up or down scaling in
vertical direction.
to PCI bus memory (graphics card) or SDRAM, while
performing horizontal scaling and conversion to one
of a several RGB and YUV formats. The PCI output
mode includes optional bitmap masking to selectively
enable/disable pixel writes to PCI (to refresh only the
exposed part of a video window) and optional RGB
overlay with alpha blending and optional chroma key-
ing.
REQUIREMENTS
Figure 14-2
Functions
Bandwidth
shows a block diagram of the PNX1300 with
shows a block diagram of the inter-
Chapter 14
14-1