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TMS28F200BZT80BDBJE Datasheet(PDF) 4 Page - Texas Instruments |
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TMS28F200BZT80BDBJE Datasheet(HTML) 4 Page - Texas Instruments |
4 / 29 page TMS28F200BZT, TMS28F200BZB 262144 BY 8-BIT/131072 BY 16-BIT BOOT-BLOCK FLASH MEMORIES SMJS200E – JUNE 1994 – REVISED JANUARY 1998 4 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 block memory maps (continued) 3FFFFh 3C000h 3BFFFh 3A000h 39FFFh 38000h 37FFFh 20000h 1FFFFh 00000h Address Range Boot Block 16K Addresses Parameter Block 8K Addresses Parameter Block 8K Addresses Main Block 96K Addresses Main Block 128K Addresses ×8 Configuration DQ15/A –1 Is LSB Address 1FFFFh 1E000h 1DFFFh 1D000h 1CFFFh 1C000h 1BFFFh 10000h 0FFFFh 00000h Address Range Boot Block 8K Addresses Parameter Block 4K Addresses Parameter Block 4K Addresses Main Block 48K Addresses Main Block 64K Addresses ×16 Configuration A0 Is LSB Address Figure 1. TMS28F200BZT ( Top Boot Block ) Memory Map 3FFFFh 20000h 1FFFFh 08000h 07FFFh 06000h 05FFFh 04000h 03FFFh 00000h Address Range Main Block 128K Addresses Main Block 96K Addresses Parameter Block 8K Addresses Parameter Block 8K Addresses Boot Block 16K Addresses ×8 Configuration DQ15/A –1 Is LSB Address 1FFFFh 10000h 0FFFFh 04000h 03FFFh 03000h 02FFFh 02000h 01FFFh 00000h Address Range Main Block 64K Addresses Main Block 48K Addresses Parameter Block 4K Addresses Parameter Block 4K Addresses Boot Block 8K Addresses ×16 Configuration A0 Is LSB Address Figure 2. TMS28F200BZB (Bottom Boot Block ) Memory Map boot-block data protection The 16K-byte boot block can be used to store key system data that is seldom changed in normal operation. To protect data within this memory sector, the RP pin can be used to provide a lockout to eliminate either accidental erase or program operations. When RP is operated with normal TTL / CMOS logic levels, the contents of the boot block cannot be erased or reprogrammed. Changes to the contents of the boot block can be made only when RP is at VHH (nominally 12 V) during normal write/erase operations. parameter block Two parameter blocks of 8K bytes each can be used like a scratch pad to store frequently updated data. Alternatively, the parameter blocks can be used for additional boot- or main-block data. If a parameter block is used to store additional boot-block data, caution should be exercised because the parameter block does not have the boot-block data-protection safety feature. |
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