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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AM41DL3234GB40IS 데이터시트(PDF) 22 Page - Advanced Micro Devices |
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AM41DL3234GB40IS 데이터시트(HTML) 22 Page - Advanced Micro Devices |
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22 / 65 page  November 12, 2001 Am41DL32x4G 21 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. This mode is primarily intended for programming equip- ment to automati c al l y matc h a dev i c e to be programmed with its corresponding programming algorithm. The autoselect codes can also be accessed in-system through the command register. The host system can issue the autoselect command via the command regis- ter, as shown in Tables 15 and 17. This method does not require V ID. Refer to the Autoselect Command Se- quence 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 Table 10). Table 10. Top 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. Note that the sector unprotect algorithm un- protects all sectors in parallel. All previously protected sectors must be individually re-protected. To change data in protected sectors efficiently, the temporary sector un protect function is available. See “Temporary Sector/Sector Block Unprotect”. Sector protection and unprotection can be imple- mented as follows. Sector protection and unprotection requires V ID on the RESET# pin only, and can be implemented either 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. 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. If the system asserts V IL on the WP#/ACC pin, the de- vice disables program and erase functions in the two “outermost” 8 Kbyte boot sectors independently of whether those sectors were protected or unprotected using the method described in “Sector/Sector Block Protection and Unprotection”. The two outermost 8 Kbyte boot sectors are the two sectors containing the lowest addresses in a top-boot-configured device, or the two sectors containing the highest addresses in a top-boot-configured device. If the system asserts V IH on the WP#/ACC pin, the de- vice reverts to whether the two outermost 8 Kbyte boot sectors were last set to be protected or unprotected. That is, sector protection or unprotection for these two sectors depends on whether they were last protected or unprotected using the method described in “Sec- tor/Sector Block Protection and Unprotection”. Sector A20–A12 Sector/ Sector Block Size SA0 000000XXX 64 Kbytes SA1-SA3 000001XXX, 000010XXX 000011XXX 192 (3x64) Kbytes SA4-SA7 0001XXXXX 256 (4x64) Kbytes SA8-SA11 0010XXXXX 256 (4x64) Kbytes SA12-SA15 0011XXXXX 256 (4x64) Kbytes SA16-SA19 0100XXXXX 256 (4x64) Kbytes SA20-SA23 0101XXXXX 256 (4x64) Kbytes SA24-SA27 0110XXXXX 256 (4x64) Kbytes SA28-SA31 0111XXXXX 256 (4x64) Kbytes SA32-SA35 1000XXXXX 256 (4x64) Kbytes SA36-SA39 1001XXXXX 256 (4x64) Kbytes SA40-SA43 1010XXXXX 256 (4x64) Kbytes SA44-SA47 1011XXXXX 256 (4x64) Kbytes SA48-SA51 1100XXXXX 256 (4x64) Kbytes SA52-SA55 1101XXXXX 256 (4x64) Kbytes SA56-SA59 1110XXXXX 256 (4x64) Kbytes SA60-SA62 111100XXX, 111101XXX, 111110XXX 192 (4x64) Kbytes SA63 111111000 8 Kbytes SA64 111111001 8 Kbytes SA65 111111010 8 Kbytes SA66 111111011 8 Kbytes SA67 111111100 8 Kbytes SA68 111111101 8 Kbytes SA69 111111110 8 Kbytes SA70 111111111 8 Kbytes Sector A20–A12 Sector/ Sector Block Size |
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