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AM70PDL127CDH Datasheet(PDF) 43 Page - Advanced Micro Devices |
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AM70PDL127CDH Datasheet(HTML) 43 Page - Advanced Micro Devices |
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43 / 127 page  November 24, 2003 Am70PDL127CDH/Am70PDL129CDH 41 ADV ANCE I N FO RMAT I O N Temporary Sector Unprotect This feature allows temporary unprotection of previ- ously protected sectors to change data in-system. The Sector Unprotect mode is activated by setting the RE- SET# pin to V ID. During this mode, formerly protected sectors can be programmed or erased by selecting the sector addresses. Once V ID is removed from the RE- SET# pin, all the previously protected sectors are protected again. Figure 2 shows the algorithm, and Figure 19 shows the timing diagrams, for this feature. While PPB lock is set, the device cannot enter the Temporary Sector Unprotection Mode. Figure 2. Temporary Sector Unprotect Operation SecSi™ (Secured Silicon) Sector Flash Memory Region The SecSi (Secured Silicon) Sector feature provides a Flash memory region that enables permanent part identification through an Electronic Serial Number (ESN) The 128-word SecSi sector is divided into 64 factory-lockable words that can be programmed and locked by the customer. The SecSi sector is located at addresses 000000h-00007Fh in both Persistent Pro- tection mode and Password Protection mode. It uses i n d i cato r bi ts ( D Q6 , D Q 7 ) to in di ca te the fa c- tory-locked and customer-locked status of the part. The system accesses the SecSi Sector through a command sequence (see “Enter SecSi™ Sector/Exit SecSi Sector Command Sequence”). After the system has written the Enter SecSi Sector command se- quence, it may read the SecSi Sector by using the ad- dresses normally occupied by the boot sectors. This mode of operation continues until the system issues the Exit SecSi Sector command sequence, or until power is removed from the device. On power-up, or following a hardware reset, the device reverts to send- ing commands to the normal address space. Factory-Locked Area (64 words) The fa c t o r y - lo c ked a r ea o f t h e S e c S i S e c t or (00 00 00 h-0 00 03 Fh) is locked wh en the pa r t is shipped, whether or not the area was programmed at the factory. The SecSi Sector Factory-locked Indicator Bit (DQ7) is permanently set to a “1”. AMD offers the ExpressFlash service to program the factory-locked area with a random ESN, a customer-defined code, or any combination of the two. Because only AMD can program and protect the factory-locked area, this method ensures the security of the ESN once the product is shipped to the field. Contact an AMD repre- sentative for details on using AMD’s ExpressFlash ser- vice. Note that the ACC function and unlock bypass modes are not available when the SecSi Sector is en- abled. Customer-Lockable Area (64 words) The customer-lockable area of the SecSi Sector (000040h-00007Fh) is shipped unprotected, which al- lows the customer to program and optionally lock the area as appropriate for the application. The SecSi Sector Customer-locked Indicator Bit (DQ6) is shipped as “0” and can be permanently locked to “1” by issuing the SecSi Protection Bit Program Command. The SecSi Sector can be read any number of times, but can be programmed and locked only once. Note that the accelerated programming (ACC) and unlock by- pass functions are not available when programming the SecSi Sector. The Customer-lockable SecSi Sector area can be pro- tected using one of the following procedures: ■ Follow the SecSi Sector Protection Algorithm as shown in Figure 3. This allows in-system protection of the SecSi Sector without raising any device pin to a high voltage. Note that this method is only appli- cable to the SecSi Sector. Once the SecSi Sector is locked and verified, the sys- tem must write the Exit SecSi Sector Region com- mand sequence to return to reading and writing the remainder of the array. Notes: 1. All protected sectors unprotected (If WP#/ACC = V IL, sectors 0, 1, 268, 269 in PDL 127 or in SA1-133, SA1-134, SA2-0, SA2-1 in PDL 129.will remain protected). 2. All previously protected sectors are protected once again. START Perform Erase or Program Operations RESET# = V IH Temporary Sector Unprotect Completed (Note 2) RESET# = V ID (Note 1) |
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