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EX29BDS320-70TCI Datasheet(PDF) 8 Page - Excel Semiconductor Inc. |
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EX29BDS320-70TCI Datasheet(HTML) 8 Page - Excel Semiconductor Inc. |
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8 / 59 page  ES I ES I 8 Rev. 0E May 25, 2006 ES29DL320 Excel Semiconductor inc. ADVANCED INFORMATION If the system writes the autoselect command sequence, the device enters the Autoselect mode. The system can then read some useful codes such as manufacturer and device ID from the internal reg- isters on DQ7 - DQ0. Standard read cycle timings apply in this mode. In the Autoselect mode, the fol- lowing four informations can be accessed through either autoselect command method or A9 high-volt- age autoselect method. Refer to the Table 2. - Manufacturer ID - Device ID - Security sector lock-indicator - Sector protection verify Hardware Device Reset ( RESET# ) The RESET# pin provides a hardware method of resetting the device to read array data. When the RESET# pin is driven low for at least a period of tRP , the device immediately terminates any operation in progress, tristates all output pins, and ignores all read/write commands for the duration of the RESET# pulse The device also resets the internal state machine to reading array data. The operation that was interrupted should be reinitiated once after the device is ready to accept another command sequence, to ensure data integrity. CMOS Standby during Device Reset Current is reduced for the duration of the RESET# pulse. When RESET# is held at Vss + 0.3V, the device draws the greatly reduced CMOS standby current ( ICC4 ). If RESET# is held at VIL but not within Vss+0.3V, the standby current will be greater. RY/BY# and Terminating Operations If RESET# is asserted during a program or erase operation, the RY/BY# pin remains a “0” (busy) until the internal reset operation is completed, which requires a time of tREADY (during Embedded Algo- rithms). The system can thus monitor RY/BY# to determine whether the reset operation is completed. If RESET# is asserted when a program or erase operation is not executing (RY/BY# pin is “1”), the reset operation is completed within a time of tREADY (not during Embedded Algorithms). The system can read data after the RESET# pin returns to VIH, which requires a time of tRH. RESET# tied to the System Reset The RESET# pin may be tied to the system reset cir- cuitry. A system reset would thus also reset the Flash memory, enabling the system to read the boot-up firmware from the Flash memory. Refer to the AC Characteristics tables for RESET# parame- ters and to Fig. 19 for the timing diagram. SECTOR GROUP PROTECTION The ES29DL320 features hardware sector group protection. A sector group consists of two or more adjacent sectors that are protected or unprotected at the same time. In the device, sector protection is performed on the group of sectors previously defined in the Table 3-4. Once after a group of sec- tors are protected, any program or erase operation is not allowed in the protected sector group. The previously protected sectors must be unprotected by one of the unprotect methods provided here before changing data in those sectors. Sector pro- tection can be implemented via two methods. - In-system protection - A9 High-voltage protection To check whether the sector group protection was successfully executed or not, another operation called “protect verification” needs to be per- formed after the protection operation on a group of sectors. All protection and protect verifications pro- vided in the device are summarized in detail at the Table 1. In-System Protection “In-system protection”, the primary method, requires VID (8.5V~12.5V) on the RESET# with A6=0, A1=1, and A0=0. This method can be imple- mented either in-system or via programming equip- ment. This method uses standard microprocessor bus cycle timing. Refer to Fig. 29 for timing diagram and Fig. 3 for the protection algorithm. A9 High-Voltage Protection “High-voltage protection”, the alternate method intended only for programming equipment, must force VID (8.5V~12.5V) on address pin A9 and con- trol pin OE# with A6=0, A1=1 and A0=0. Refer to Fig. 31 for timing diagram and Fig. 5 for the protec- tion algorithm. SECTOR UNPROTECTION The previously protected sectors must be unpro- tected before modifying any data in the sectors. The sector unprotection algorithm unprotects all sectors in parallel. All unprotected sectors must first |
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