BBK Dk960S, Service Manual

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MT1379
PRELIMINARY, SUBJECT TO CHANGE WITHOUT NOTICE MTK CONFIDENTIAL, NO DISCLOSURE
This is a hardware sub-picture decoder. It decodes the compressed SPU image bitstream and CHG_COLCON commands
according to SPU header information previously decoded by system controller. The SPU module also allows two SPU
objects to be displayed at the same time. SPU image is blended with main video stream.
OSD
The OSD module can operate with 2/4/16/256 -color bitmap format (1/2/4/8 bits), and 16/256 color RLC format, all have 16
levels of transparency. In addition, it accepts an special WARP mode, which inserts one programmable RLC code in the
bitmap to reduce the image size stored in DRAM. It also features automatic shadow/outline generation in 2-color mode, 2
Hilight areas, 1 ChangeColor area and 1 OSDVoid area. One OSD area can occupy the full or a partial screen, or multiple
OSDs can occur in a screen at the same time, only if they don't occupy the same horizontal line. The output image is
blended with the video-SPU mixed stream.
Cursor
A hardware cursor generator is integrated in Video Ou tput Unit. The cursor image is a 32x32 4-color bitmap image, each
colors are programmable. Cursor can be enlarged by 2 in both vertical and horizontal directions. Cursor image is multiplexed
with video-SPU-OSD mixed stream.
Audio Interface
Audio interface consists of Audio Output Interface and Microphone Input Interface.
Audio Output Interface
The MT1379 can support up to 8 channel audio outputs. The output formats can be 16, 24, or 32-bit frames. Left alignment,
right alignment, or I
2
S formats are all supported.
With built-in PLL, MT1379 can provide the audio clock (ACLK) for external audio DAC at 384Fs, where Fs is usually 32KHz,
44.1KHz, 48KHz, 96KHz, or 192KHz. ACLK can also be programmed to be from outside MT1379. When ACLK is input to
MT1379, the frequency could be 128*
n
Fs, where
n
is from 1 to 7.
Audio raw (encoded) data or cooked (decoded) data can be output on a single line using S/PDIF interface. The output slew
rate and driving force of this pad are programmable.
Microphone Input Interface
The MT1379 provides a microphone input interface. Two independent microphones’ data could be input to the MT1379.
There are two independent digital volume control for these two input channels. The input data formats can also be left
alignment, right alignment, or I
2
S formats.
System Controller
MT1379 uses an embedded Turbo-8032 as System Controller and provide ICE interface to increase the feasibility of F/W
development. Also, MT1379 includes an build-in internal 373 to latch lower byte address from 8032 Port 0 and provide a
glue-logic free solution. MT1379 supports up to 1M X 16 bits Flash ROM to store 8032 code, H/W related data, User data, etc.
F/W upgrade can be achieved either by debug interface or by disk.