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AM29F017B-70EC Scheda tecnica(PDF) 10 Page - Advanced Micro Devices |
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AM29F017B-70EC Scheda tecnica(HTML) 10 Page - Advanced Micro Devices |
10 / 35 page 10 Am29F017B P R E L I M I NARY 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 equipment to automatically match a device to be programmed with its corresponding programming algorithm. However, the autoselect codes can also be accessed in-system through the command register. When using programming equipment, the autoselect mode requires VID (11.5 V to 12.5 V) on address pin A9. Address pins A6, A1, and A0 must be as shown in Autoselect Codes (High Voltage Method) table. In addi- tion, when verifying sector protection, the sector ad- dress must appear on the appropriate highest order address bits. Refer to the corresponding Sector Ad- dress Tables. The Command Definitions table shows the remaining address bits that are don’t care. When all necessary bits have been set as required, the program- ming equipment may then read the corresponding identifier code on DQ7–DQ0. To access the autoselect codes in-system, the host system can issue the autoselect command via the command register, as shown in the Command Defini- tions table. This method does not require VID. See “Command Definitions” for details on using the autose- lect mode. Table 3. Am29F017B Autoselect Codes (High Voltage Method) L = Logic Low = VIL, H = Logic High = VIH, SA = Sector Address, X = Don’t care. Sector Group Protection/Unprotection The hardware sector group protection feature dis- ables both program and erase operations in any sec- tor. Each sector group consists of four adjacent sectors. Table 4 shows how the sectors are goruped, and the address range that each sector group con- tains. The hardware sector group unprotection fea- ture re-enables both program and erase operations in previously protected sectors. Sector group protection/unprotection must be imple- mented using programming equipment. The procedure requires a high voltage (VID) on address pin A9 and the control pins. Details on this method are provided in a supplement, publication number 21544. Contact an AMD representative to obtain a copy of the appropriate document. The device is shipped with all sector groups unpro- tected. AMD offers the option of programming and pro- tecting sectors at its factory prior to shipping the device through AMD’s ExpressFlash™ Service. Contact an AMD representative for details. It is possible to determine whether a sector group is protected or unprotected. See “Autoselect Mode” for details. Table 4. Sector Group Addresses Temporary Sector Group Unprotect This feature allows temporary unprotection of previ- ously protected sectors groups to change data in-sys- tem. The Sector Group Unprotect mode is activated by setting the RESET# pin to VID. During this mode, formerly protected sector groups can be programmed or erased by selecting the sector group addresses. Once VID is removed from the RESET# pin, all the pre v io us l y pr ote c t ed s e c t or g r oups are protected again. Figure 1 shows the algorithm, and the Temporary Sector/Sector Group Unprotect dia- gram shows the timing waveforms, for this feature. Description CE# OE# WE# A20-A18 A17-A10 A9 A8-A7 A6 A5-A2 A1 A0 DQ7-DQ0 Manufacturer ID: AMD LL H X X VID XVIL XVIL VIL 01h Device ID: Am29F017B LL H X X VID XVIL XVIL VIH 3Dh Sector Group Protection Verification LL H Sector Group Address XVID XVIL XVIH VIL 01h (protected) 00h (unprotected) Sector Group A20 A19 A18 Sectors SGA0 0 0 0 SA0 –SA3 SGA1 0 0 1 SA4 –SA7 SGA2 0 1 0 SA8 –SA11 SGA3 0 1 1 SA12 –SA15 SGA4 1 0 0 SA16 –SA19 SGA5 1 0 1 SA20 –SA23 SGA6 1 1 0 SA24 –SA27 SGA7 1 1 1 SA28 –SA31 |
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