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29F1610A-10 数据表(PDF) 13 Page - Macronix International |
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29F1610A-10 数据表(HTML) 13 Page - Macronix International |
13 / 39 page 13 P/N: PM0506 REV.1.7, JUN. 15, 2001 MX29F1610A SECTOR UNPROTECT It is also possible to unprotect the sector , same as the first five write command cycles in activating sector protection mode followed by the Unprotect Sector command - 40H, the automatic Unprotect operation begins on the rising edge of the last WE pulse in the command sequence and terminates when the Status on DQ7 is '1' at which time the device stays at the read status register mode.(Refer to table 3,6 and Figure 11,12) The users have to write Verify Sector Protect command to verify protect status after executing Sector Unprotect. The device remains enabled for read status register mode until the CIR contents are altered by a valid command sequence. Either Protect or Unprotect sector mode is accomplished by keeping WP high, i.e. protect-bit status can only be changed with a valid command sequence and WP at high. Protect-bit status will not be changed during chip/sector erase operations. Only unprotected sectors can be programmed or erased regardless of the WP pin. HARDWARE SECTOR PROTECTION The MX29F1610A features sector protection. This feature will disable both program and erase operations. The sector protection feature is enabled using system software by the user(Refer to table 3). The device is shipped with all sectors unprotected. Alternatively, MXIC may protect all sectors in the factory prior to shipping the device. SECTOR PROTECTION To activate this mode, a six-bus cycle operation is required. There are two 'unlock' write cycles. These are followed by writing the 'set-up' command. Two more 'unlock' write cycles are then followed by the Lock Sector command - 20H. Sector address is latched on the falling edge of CE or WE of the sixth cycle of the command sequence. The automatic Lock operation begins on the rising edge of the last WE pulse in the command sequence and terminates when the Status on DQ7 is '1' at which time the device stays at the read status register mode. The users have to write Verify Sector Protect command to verify protect status after executing Sector Protector. The device remains enabled for read status register mode until the CIR contents are altered by a valid command sequence (Refer to table 3,6 and Figure 10,12 ). VERIFY SECTOR PROTECT To verify the Protect status, operation is initiated by writing Silicon ID read command into the command register. Following the command write, a read cycle from address XXX0H retrieves the Manufacturer code of C2H. A read cycle from XXX1H returns the Device code FAH/ FBH. A read cycle from appropriate address returns information as to which sectors are protected. To terminate the operation, it is necessary to write the read/ reset command sequence into the CIR. (Refer to table 3,4 and Figure 12) A few retries are required if Protect status can not be verified successfully after each operation. DEEP POWER-DOWN MODE The MXIC's16 Mbit flash family supports a typical ICC of 1uA in deep power-down mode. One of the target markets for these devices is in protable equipment where the power consumption of the machine is of prime importance. When PWD is a logic low (GND ± 0.2V), all circuits are turned off and the device typically draws 1uA of ICC current. During erase or program modes, PWD low will abort either erase or program operation. The contents of the memory are no longer valid as the data has been corrupted by the PWD function. PWD transitions to VIL or turning power off to the device will clear the status register. PWD pin is not provided in 44-pin SOP package. |
类似零件编号 - 29F1610A-10 |
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类似说明 - 29F1610A-10 |
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