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TMS28F008AST Datasheet(PDF) 12 Page - Texas Instruments |
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TMS28F008AST Datasheet(HTML) 12 Page - Texas Instruments |
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12 / 52 page  TMS28F008Axy,TMS28F800Axy 1048576 BY 8BIT/524288 BY 16BIT AUTOSELECT BOOT BLOCK FLASH MEMORIES SMJS851A − NOVEMBER 1997 − REVISED MARCH 1998 12 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 block memory maps (continued) Main Block 128K Addresses Parameter Block 8K Addresses Boot Block 16K Addresses FFFFFh E0000h DFFFFh C0000h BFFFFh A0000h 9FFFFh 80000h 7FFFFh 60000h 5FFFFh 40000h 3FFFFh 20000h 1FFFFh 08000h 7FFFh 06000h 5FFFh 04000h 3FFFh 00000h Address Range 8-bit Configuration DQ15/A −1 Is LSB Address 7FFFFh 70000h 6FFFFh 60000h 5FFFFh 50000h 4FFFFh 40000h 3FFFFh 30000h 2FFFFh 20000h 1FFFFh 10000h 0FFFFh 04000h 03FFFh 03000h 02FFFh 02000h 01FFFh 00000h Address Range 16-bit Configuration A0 Is LSB Address Main Block 96K Addresses Main Block 128K Addresses Main Block 128K Addresses Main Block 128K Addresses Main Block 128K Addresses Main Block 128K Addresses Main Block 128K Addresses Parameter Block 8K Addresses Boot Block 8K Addresses Parameter Block 4K Addresses Parameter Block 4K Addresses Main Block 48K Addresses Main Block 64K Addresses Main Block 64K Addresses Main Block 64K Addresses Main Block 64K Addresses Main Block 64K Addresses Main Block 64K Addresses Main Block 64K Addresses NOTE A: ’28F008Axy is offered in a 40-pin TSOP package, 8-bit configuration only, and A0 is LSB adddress. Figure 2. TMS28F008AxB and TMS28F800AxB (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. Data in this block can be secured by using different combinations of the reset/deep power-down pin (RP), the write protect pin (WP) and VPP supply levels. Table 2 provides a list of these combinations. 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 must be exercised because the parameter block does not have the boot-block data-protection safety feature. main block Primary memory on the TMS28F800Axy is located in eight main blocks. Seven of the blocks have storage capacity for 128K bytes and the eighth block has storage capacity for 96K bytes. |
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