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MX29F100T Datasheet(PDF) 12 Page - Macronix International |
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MX29F100T Datasheet(HTML) 12 Page - Macronix International |
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12 / 47 page  12 P/N:PM0548 MX29F100T/B REV. 1.2, NOV. 12, 2001 ERASE RESUME This command will cause the command register to clear the suspend state and return back to Sector Erase mode but only if an Erase Suspend command was previously issued. Erase Resume will not have any effect in all other conditions.Another Erase Suspend command can be written after the chip has resumed erasing. SET-UP AUTOMATIC PROGRAM COMMANDS To initiate Automatic Program mode, a three-cycle command sequence is required. There are two "un- lock" write cycles. These are followed by writing the Automatic Program command A0H. Once the Automatic Program command is initiated, the next WE pulse causes a transition to an active programming operation. Addresses are latched on the falling edge, and data are internally latched on the rising edge of the WE pulse. The rising edge of WE also begins the programming operation. The system is not required to provide further controls or timings. The device will automatically provide an adequate internally generated program pulse and verify margin. If the program opetation was unsuccessful, the data on Q5 is "1"(see Table 4), indicating the program operation exceed internal timing limit. The automatic programming operation is completed when the data read on Q6 stops toggling for two consecutive read cycles and the data on Q7 and Q6 are equivalent to data written to these two bits, at which time the device returns to the Read mode(no program verify command is required). WRITE OPERATION STATUS DATA POLLING-Q7 The MX29F100T/B also features Data Polling as a method to indicate to the host system that the Automatic Program or Erase algorithms are either in progress or completed. While the Automatic Programming algorithm is in operation, an attempt to read the device will produce the complement data of the data last written to Q7. Upon completion of the Automatic Program Algorithm an attempt to read the device will produce the true data last written RY/BY:Ready/Busy The RY/BY is a dedicated, open-drain output pin that indicates whether an Automatic Erase/Program algorithm is in progress or complete. The RY/BY status is valid after the rising edge of the final WE pulse in the command sequence. Since RY/BY is an open-drain output, several RY/BY pins can be tied together in parallel with a pull-up resistor to Vcc. If the outputs is low (Busy), the device is actively erasing or programming. (This includes programming in the Erase Suspend mode.) If the output is high (Ready), the device is ready to read array data (including during the Erase Suspend mode), or is in the standby mode. TOGGLE BIT-Q6 The MX29F100T/B features a "Toggle Bit" as a method to indicate to the host system that the Auto Program/Erase algorithms are either in progress or completed. While the Automatic Program or Erase algorithm is in progress, successive attempts to read data from the device will result in Q6 toggling between one and zero. Once the Automatic Program or Erase algorithm is completed, Q6 will stop toggling and valid data will be read. The toggle bit is valid after the rising edge of the sixth WE pulse of the six write pulse sequences for chip/ sector erase. The Toggle Bit feature is active during Automatic Program/ Erase algorithms or sector erase time-out.(see section Q3 Sector Erase Timer) to Q7. The Data Polling feature is valid after the rising edge of the fourth WE pulse of the four write pulse sequences for automatic program. While the Automatic Erase algorithm is in operation, Q7 will read "0" until the erase operation is competed. Upon completion of the erase operation, the data on Q7 will read "1". The Data Polling feature is valid after the rising edge of the sixth WE pulse of six write pulse sequences for automatic chip/sector erase. The Data Polling feature is active during Automatic Program/Erase algorithm or sector erase time-out.(see section Q3 Sector Erase Timer) |
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