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W49F201T-45B Datasheet(PDF) 5 Page - Winbond |
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W49F201T-45B Datasheet(HTML) 5 Page - Winbond |
5 / 23 page Preliminary W49F201 Publication Release Date: June 1999 - 5 - Revision A1 Toggle Bit (DQ6)- Write Status Detection In addition to data polling, the W49F201 provides another method for determining the end of a program cycle. During the internal program or erase cycle, any consecutive attempts to read DQ6 will produce alternating 0's and 1's. When the program or erase cycle is completed, this toggling between 0's and 1's will stop. The device is then ready for the next operation. Product Identification The product ID operation outputs the manufacturer code and device code. Programming equipment automatically matches the device with its proper erase and programming algorithms. The manufacturer and device codes can be accessed by software or hardware operation. In the software access mode, a six-word (or JEDEC 3-word) command sequence can be used to access the product ID. A read from address 0000H outputs the manufacturer code, 00DA(hex). A read from address 0001(hex) outputs the device code, 00AE(hex). The product ID operation can be terminated by a three-word command sequence or an alternative one-word command sequence (see Command Definition table). In the hardware access mode, access to the product ID is activated by forcing CE and OE low, WE high, and raising A9 to 12 volts. TABLE OF OPERATING MODES Operating Mode Selection (VHH = 12V ±5 %) MODE PINS CE OE WE RESET ADDRESS DQ. Read VIL VIL VIH VIH AIN Dout Erase/Program VIL VIH VIL VIH AIN Din Standby VIH X X VIH X High Z Erase/Program X VIL X VIH X High Z/DOUT Inhibit X X VIH VIH X High Z/DOUT Output Disable X VIH X VIH X High Z Product ID VIL VIL VIH VIH A0 = VIL; A1 −A15 = VIL; A9 = VHH Manufacturer Code 00DA (Hex) VIL VIL VIH VIH A0 = VIH; A1 −A15 = VIL; A9 = VHH Device Code 00AE (Hex) Reset X X X VIL X High Z |
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