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SAA5647HL Datasheet(PDF) 11 Page - NXP Semiconductors |
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SAA5647HL Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 112 page 2001 Dec 13 11 Philips Semiconductors Product specification Enhanced TV microcontrollers with On-Screen Display (OSD) SAA56xx 8.2 ROM protection and verification SAA56xx devices have a set of security bits allied with each section of the device, 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 can be programmed once only and cannot be erased. The SAA56xx security bits are set as shown in Fig.4 for production programmed devices and are set as shown in Fig.5 for production blank devices. handbook, full pagewidth GSA036 PROGRAM ROM (128 or 192 kbytes) MEMORY USER ROM PROGRAMMING VERIFY DISABLED ENABLED DISABLED ENABLED DISABLED ENABLED SECURITY BITS SET CHARACTER ROM (12 kbytes) PACKET 26 ROM (4 kbytes) Fig.4 Security bits for production programmed devices. handbook, full pagewidth GSA037 PROGRAM ROM (128 OR 192 kbytes) MEMORY USER ROM PROGRAMMING VERIFY ENABLED ENABLED ENABLED ENABLED ENABLED ENABLED SECURITY BITS SET CHARACTER ROM (12 kbytes) PACKET 26 ROM (4 kbytes) Fig.5 Security bits for production blank devices. |
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