Vizio VW42L HDTV10A, Service Manual

Page: 50 / 98

CONFIDENTIAL – DO NOT COPY Page 7-19
File No. SG-0211
3. Mode selection
In the L32 LCD TV TDA8946AJ has two functional modes, which can be selected by
applying the proper DC voltage to pin MODE.
1. Mute — In this mode the amplifier is DC-biased but not operational (no audio
output).
This allows the input coupling capacitors to be charged to avoid pop-noise. The device
is in mute mode when 3.5 V < VMODE < (VCC
 1.5 V).
2. Operating — In this mode the amplifier is operating normally. The operating mode is
activated at VMODE<1.0V.
Flash: MX29LV320BTTC
The MX29LV320AT/B is a 32-mega bit Flash memory organized as 4M bytes of 8 bits
and 2M words of 16 bits. MXIC's Flash memories offer the most cost-effective and
reliable read/write non-volatile random access memory.
The MX29LV320AT/B is packaged in 48-pin TSOP and 48-ball CSP. It is designed to
be reprogrammed and erased in system or in standard EPROM programmers. The
standard MX29LV320AT/B offers access time as fast as 70ns, allowing operation of
high-speed microprocessors without wait states. To eliminate bus contention, the
MX29LV320AT/B has separate chip enable (CE) and output enable (OE) controls.
MXIC's Flash memories augment EPROM functionality with in-circuit electrical erasure
and programming. The MX29LV320AT/B uses a command register to manage this
functionality. MXIC Flash technology reliably stores memory contents even after
100,000 erase and program cycles. The MXIC cell is designed to optimize the erase
and program mechanisms. In addition, the combination of advanced tunnel oxide
processing and low internal electric fields for erase and programming operations
produces reliable cycling.