Enhanced PCI Bus Multimedia Controller
3.0 PIN DESCRIPTIONS (CONTINUED)
Symbol
SCL
Type
[1]
OD
Direction
I/O
Description
I
2
C bus clock (qualifies for a single master operation only).
General Purpose Programmable Inputs/Outputs (8 pins)
GPIO[7:0]
3-state
I/O
General purpose input/output pins. After hardware or software reset all 8 pins are configured as
inputs. Their logical levels are reflected as register bits. Any of the pins can be configured as
output. In this state its logical level is driven by a register bit. These pins may be used to monitor
or control various board-level functions.
Test Pins (2 pin)
ENID
TEST
Power (80 pins)
GND
VDD
ground
power
Ground (50 pins).
Power supply (5V) (30 pins).
Test
Test
I
I
Used for IDD test. In normal operation must be connected to GND.
Test pin used in test mode only. In normal operation must be connected to GND.
1. I - standard input-only • O - standard active driver • 3-state - bi-directional I/O pin • 3-state* - a special type of 3-state, as defined in the PCI spec. May be driven by
only one PCI agent at any time • OD - open drain, may be shared by multiple drivers, as a wired-or.
4.0 FUNCTIONAL OVERVIEW
The ZR36057 multimedia controller performs the following
functions:
• Interfacing to a YUV 4:2:2 digital video bus (e.g., Phillips
SAA7110 or SAA7111).
• Video DMA channel for burst transfers of video pixels.
• Independent horizontal and vertical downscaling of the input
image, with optional horizontal filtering.
• Optional sync mastering with configurable HSYNC and
VSYNC pulse widths and polarity.
• Conversion of the YUV 4:2:2 digital video input into one of
the following pixel formats: YUV 4:2:2, RGB 5,6,5, RGB
5,5,5 or RGB 8,8,8 (packed or unpacked).
• Overlay support: any number of video pixels can be masked
off, letting the corresponding graphics pixels appear instead
of them.
• Frame grabbing.
• Two display modes: emulation of the interlaced input video,
or a single field display.
• Bidirectional Code DMA transfer with support for fragmented
code buffers.
• Control of the ZR36050/ZR36016 Motion JPEG chip set.
The ZR36057 supports digital video in CCIR 601 or square pixel
formats, following either the NTSC or PAL video standard. Other
non-standard input schemes are supported as well.
The functional description below follows the block diagram.
4.1 Digital Video Path
4.1.1 Digital Video Front End (VFE)
The VFE samples the incoming YUV 4:2:2 video data and sync
signals with a flexible sampling scheme, that makes it compati-
ble with a wide variety of digital video sources. The digital input
video can be cropped. The input resolutions supported by the
VFE range from 32x32 to 1023x1023, in increments of one pixel.
4.1.2 Video Input Processor
The chroma components of the video data are upsampled to
YUV 4:4:4 format. All components are horizontally filtered. Five
filtering schemes are implemented, with different parameters for
chrominance and luminance samples. Horizontal and vertical
downscaling is available if required. The vertical downscaling
can be optimized for live video or Motion JPEG playback, in
which each field is independent, or for the output of an MPEG-1
decoder such as the ZR36100 or ZR36110, which duplicates
fields to produce its interlaced video output.
4.1.3 Pixel Formatting
The filtered and scaled video is converted to the desired color
space and packed according to the selected pixel format. YUV
4:2:2, 24-bit RGB (packed or unpacked) and 15- and 16-bit RGB
are supported. An error diffusion algorithm can be applied to the
RGB 5,5,5 and 5,6,5, in order to eliminate quantization artifacts
on the output image.
4.2 Video DMA Controller
4.2.1 Pixel Bursts
The packed pixels are transferred directly to the display memory
(or to the system memory), using PCI DMA bursts. Both Little
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