Toshiba 29VH27E, Service Manual

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data outputs prior to applying input data. If a LATE WRITE or READ-MODIFY-WRITE is attempted
while keeping OE# LOW, no write will occur, and the data outputs will drive read data from the
accessed location. The four data inputs and the four data outputs are routed through four pins using
common I/O, and pin direction is controlled by WE# and OE#.
14.5.2.Features
• Industry-standard x4 pin out, timing, functions and packages
• State-of-the-art, high-performance, low-power CMOS silicon-gate process
• Single power supply (+3.3V ±0.3V or +5V ±10%)
• All inputs, outputs and clocks are TTL-compatible
• Refresh modes: RAS#-ONLY, HIDDEN and CAS#-BEFORE - RAS# (CBR)
• Optional Self Refresh (S) for low-power data retention
• 11 row, 11 column addresses (2K refresh) or 12 row, 10 column addresses (4K refresh)
• Extended Data-Out (EDO) PAGE MODE access cycle
• 5V-tolerant inputs and I/Os on 3.3V devices
14.5.3.Pin Assignment
Top View
*NC on 2K refresh and A11 on 4K refresh options.
Note:
The “#” symbol indicates signal is active LOW.
14.6.SDA9400
14.6.1.General Description
The SDA9400 is a new component of the Micronas MEGAVISION ® IC set in a 0.35µm embedded
DRAM technology (frame memory embedded). The SDA9400 is pin compatible to the SDA9401 (field
memory embedded). The SDA9400 comprises all main functionalities of a digital feature box in one
monolithic IC. The scan rate conversion to 100/120 Hz interlaced (50/60 Hz progressive) is based on a
motion adaptive algorithm. The scan rate converted picture can be vertically expanded. The SDA9400
has a free running mode, therefore features like scan rate conversion to e.g. 70, 75 Hz with joint lines or
multiple picture display (e.g. tuner scan) are possible. Due to the frame based signal processing, the
noise reduction has been greatly improved. Furthermore separate motion detectors for luminance and
chrominance have been implemented. For automatic controlling of the noise reduction parameters a
noise measurement algorithm is included, which measures the noise level in the picture or in the
blanking period. In addition a spatial noise reduction is implemented, which reduces the noise even in
the case of motion. The input signal can be compressed horizontally and vertically with a certain
number of factors. Therefore split screen is supported. Beside these additional functions like coloured
background, windowing and flashing are implemented.
14.6.2.Features
• Two input data formats
- 4:2:2 luminance and chrominance parallel (2 x 8 wires)
- ITU-R 656 data format (8 wires)