Rolsen RDV-750, Руководство по обслуживанию

Страница: 13 / 44

12
CIRCUIT OPERATIONAL DESCRIPTION
3. Flash Memory : A29800UV-70(A29800TV-70/AT49F8192AT/HY29F800ABT-70)
This stores every program required for the operation of DVD player and holds the
data of OSD languages and LOGO and send them upon request from u-COM. This
allows the update of firmware by CD-R/RW. For DVD module.
Description
The A29800UV-70 is a 5.0 volt only Flash memory organized as 1048,576 bytes
of 8 bits or 524,288 words of 16 bits each. The A29800UV-70 offers the RESET
function. The 1024 Kbytes of data are further divided into nineteen sectors for
flexible sector erase capability. The 8 bits of data appear on I/O
0
- I/O
7
while the
addresses are input on A1 to A18; the 16 bits of data appear on I/O
0
~I/O
15
. . The
A29800UV-70 is offered in 44-pin SOP and 48-Pin TSOP packages. This device is
designed to be programmed in-system with the standard system 5.0 volt VCC
supply. Additional 12.0 volt VPP is not required for in-system write or erase
operations. However, the A29800UV-70 can also be programmed in standard
EPROM programmers.
A29800UV-70 Block Diagram