參數資料
型號： TDA938X
廠商： NXP Semiconductors N.V.
英文描述： TV signal processor-Teletext decoder with embedded m-Controller
中文描述： 電視信號處理器與嵌入式米圖文電視解碼器控制器
文件頁數： 13/140頁
文件大小： 570K
代理商： TDA938X
Philips Semiconductors
Preliminary specification
1999 Sep 28
13
TV signal processor-Teletext decoder with
embedded
μ
-Controller
TDA 935X/6X/8X series
Security Bits - Program and Verify
TDA935X/6X/8X devices have three sets of security bits, one set for each of the three One Time Programmable
memories, i.e. Program ROM, Character ROM and Packet 26 ROM. The security bits are used to prevent the
ROM from being overwritten once programmed, and also the contents being verified once programmed. The
security bits are one-time programmable and
cannot
be erased.
The TDA935X/6X/8X memory and security bits are structured as shown in Figure 6. The security bits are set as
shown in Figure 7 for production programmed devices and are set as shown in Figure 8 for production blank
devices.
Figure 6 Memory and security bit structures
Figure 7 Security bits for production devices
handbook, full pagewidth
MBK953
PROGRAM ROM
MEMORY
USER ROM PROGRAMMING
(ENABLE/DISABLE)
VERIFY
(ENABLE/DISABLE)
SECURITY BITS INTERACTION
(128K x 8-Bit)
CHARACTER ROM
(9K x 12-Bit)
PACKET 26 ROM
(4K x 8-Bit)
USER ROM PROGRAMMING
(ENABLE/DISABLE)
VERIFY
(ENABLE/DISABLE)
USER ROM PROGRAMMING
(ENABLE/DISABLE)
VERIFY
(ENABLE/DISABLE)
User Rom
User Rom
User Rom
handbook, full pagewidth
MBK954
PROGRAM ROM
MEMORY
USER ROM PROGRAMMING
(ENABLE/DISABLE)
VERIFY
(ENABLE/DISABLE)
DISABLED
ENABLED
DISABLED
ENABLED
DISABLED
ENABLED
SECURITY BITS SET
CHARACTER ROM
PACKET 26 ROM
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