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ES29DL160F-70RTG Datasheet(PDF) 8 Page - Excel Semiconductor Inc. |
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ES29DL160F-70RTG Datasheet(HTML) 8 Page - Excel Semiconductor Inc. |
8 / 52 page ES I ES I 8 Rev.1C January 5, 2006 ES29LV400D Excel Semiconductor inc. 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# parameters and to Fig. 17 for the timing diagram. SECTOR PROTECTION The ES29LV400 features hardware sector protec- tion. In the device, sector protection is performed on the sector previously defined in the Table 3-4. Once after a sector is protected, any program or erase operation is not allowed in the protected sector. The previously protected sectors must be unprotected by one of the unprotect methods provided here before changing data in those sectors. Sector protection can be implemented via two methods. - In-system protection - A9 High-voltage protection To check whether the sector protection was suc- cessfully executed or not, another operation called “protect verification” needs to be performed after the protection operation on a sector. All protection and protect verifications provided in the device are summarized in detail at the Table 1. In-System Protection “In-system protection”, the primary method, requires VID (11.5V~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. 26 for timing diagram and Fig. 2 for the protection algorithm. A9 High-Voltage Protection “High-voltage protection”, the alternate method intended only for programming equipment, must force VID (11.5~12.5V) on address pin A9 and con- trol pin OE# with A6=0, A1=1 and A0=0. Refer to Fig. 28 for timing diagram and Fig. 4 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 be protected prior to the first sector unprotection write cycle to avoid any over-erase due to the intrin- sic erase characteristics of the protection cell. After the unprotection operation, all previously protected sectors will need to be individually re-protected. Standard microprocessor bus cycle timings are used in the unprotection and unprotect verification operations. Three unprotect methods are provided in the ES29LV400 device. All unprotection and unprotect verification cycles are summarized in detail at the Table 1. - In-system unprotection - A9 High-voltage unprotection - Temporary sector unprotection |
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