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AM41PDS3224D 데이터시트(PDF) 25 Page - Advanced Micro Devices |
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AM41PDS3224D 데이터시트(HTML) 25 Page - Advanced Micro Devices |
25 / 59 page 24 Am41PDS3224D May 13, 2002 P R E L IMINARY Figure 3. Unlock Bypass Algorithm The device offers accelerated program operations through the WP#/ACC pin. When the system asserts V HH on the WP#/ACC pin, the device automatically en- ters the Unlock Bypass mode. The system may then write the two-cycle Unlock Bypass program command sequence. The device uses the higher voltage on the WP#/ACC pin to accelerate the operation. Note that the WP#/ACC pin must not be at V HH any operation other than accelerated programming, or device dam- age may result. In addition, the WP#/ACC pin must not be left floating or unconnected; inconsistent behavior of the device may result. Figure 4 illustrates the algorithm for the program oper- ation. Refer to the Flash Erase and Program Opera- tions table in the AC Characteristics section for parameters, and Figure 18 for timing diagrams. Note: See Table 10 for program command sequence. Figure 4. Program Operation Chip Erase Command Sequence Chip erase is a six bus cycle operation. The chip erase command sequence is initiated by writing two unlock cycles, followed by a set-up command. Two additional unlock write cycles are then followed by the chip erase command, which in turn invokes the Embedded Erase algorithm. The device does not require the system to preprogram prior to erase. The Embedded Erase algo- rithm automatically preprograms and verifies the entire memory for an all zero data pattern prior to electrical erase. The system is not required to provide any con- trols or timings during these operations. Table 10 shows the address and data requirements for the chip erase command sequence. Start 555h/AAh 2AAh/55h XXXh/A0h 555h/20h Verify Byte? No Program Address/Program Data Data# Polling Device Last Address ? Programming Completed (BA) XXXh/90h XXXh/00h Increment Address No Yes Yes Set Unlock Bypass Mode In Unlock Bypass Program Reset Unlock Bypass Mode START Write Program Command Sequence Data Poll from System Verify Data? No Yes Last Address? No Yes Programming Completed Increment Address Embedded Program algorithm in progress |
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