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AM41DL1624DT30IS Datasheet(PDF) 20 Page - Advanced Micro Devices |
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AM41DL1624DT30IS Datasheet(HTML) 20 Page - Advanced Micro Devices |
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20 / 63 page  Am41DL16x4D 19 P R E L IMINARY Autoselect Mode The autoselect mode provides manufacturer and de- vice identification, and sector protection verification, through identifier codes output on DQ7–DQ0. The au- toselect codes can be accessed in-system through the command register. Refer to the Autoselect Command Sequence section for more information.Sector/Sector Block Protection and Unprotection (Note: For the following discussion, the term “sector” applies to both sectors and sector blocks. A sector block consists of two or more adjacent sectors that are protected or unprotected at the same time (see Tables 10 and 11). Table 10. Top Boot Sector/Sector Block Addresses for Protection/Unprotection Table 11. Bottom Boot Sector/Sector Block Addresses for Protection/Unprotection The hardware sector protection feature disables both program and erase operations in any sector. The hard- ware sector unprotection feature re-enables both program and erase operations in previously protected sectors. Sector protection and unprotection can be im- plemented as follows. Sector protection/unprotection requires V ID on the RE- SET# pi n only, and c an be i mplem ented ei th er in-system or via programming equipment. Figure 2 shows the algorithms and Figure 26 shows the timing diagram. This method uses standard microprocessor bus cycle timing. For sector unprotect, all unprotected sectors must first be protected prior to the first sector unprotect write cycle. Note that the sector unprotect algorithm unprotects all sectors in parallel. All previ- o u s l y pr ot e c te d s e c t or s m u s t be i n d i v i du al l y re-protected. To change data in protected sectors effi- ciently, the temporary sector un protect function is available. See “ Temporary Sector/Sector B lock Unprotect”. The device is shipped with all sectors unprotected. It is possible to determine whether a sector is pro- tected or unprotected. See the Autoselect Mode section for details. Write Protect (WP#) The Write Protect function provides a hardware method of protecting certain boot sectors without using V ID. This function is one of two provided by the WP#/ACC pin. Sector / Sector Block A19–A12 Sector / Sector Block Size SA0 00000XXX 64 Kbytes SA1-SA3 00001XXX, 00010XXX, 00011XXX 192 (3x64) Kbytes SA4-SA7 001XXXXX 256 (4x64) Kbytes SA8-SA11 010XXXXX 256 (4x64) Kbytes SA12-SA15 011XXXXX 256 (4x64) Kbytes SA16-SA19 100XXXXX 256 (4x64) Kbytes SA20-SA23 101XXXXX 256 (4x64) Kbytes SA24-SA27 110XXXXX 256 (4x64) Kbytes SA28-SA30 11100XXX, 11101XXX, 11110XXX 192 (3x64) Kbytes SA31 11111000 8 Kbytes SA32 11111001 8 Kbytes SA33 11111010 8 Kbytes SA34 11111011 8 Kbytes SA35 11111100 8 Kbytes SA36 11111101 8 Kbytes SA37 11111110 8 Kbytes SA38 11111111 8 Kbytes Sector / Sector Block A19–A12 Sector / Sector Block Size SA38 11111XXX 64 Kbytes SA37-SA35 11110XXX, 11101XXX, 11100XXX 192 (3x64) Kbytes SA34-SA31 110XXXXX 256 (4x64) Kbytes SA30-SA27 101XXXXX 256 (4x64) Kbytes SA26-SA23 100XXXXX 256 (4x64) Kbytes SA22-SA19 011XXXXX 256 (4x64) Kbytes SA18-SA15 010XXXXX 256 (4x64) Kbytes SA14-SA11 001XXXXX 256 (4x64) Kbytes SA10-SA8 00001XXX, 00010XXX, 00011XXX 192 (3x64) Kbytes SA7 00000111 8 Kbytes SA6 00000110 8 Kbytes SA5 00000101 8 Kbytes SA4 00000100 8 Kbytes SA3 00000011 8 Kbytes SA2 00000010 8 Kbytes SA1 00000001 8 Kbytes SA0 00000000 8 Kbytes |
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