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P8242AH Datasheet(PDF) 6 Page - Intel Corporation |
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P8242AH Datasheet(HTML) 6 Page - Intel Corporation |
6 / 20 page UPI-41AH42AH 210393 – 11 Figure 8 UPI-41AH42AH 80-Column Matrix Printer Interface PROGRAMMING AND VERIFYING THE 8741AH AND 8742AH OTP EPROM Programming Verification In brief the programming process consists of acti- vating the program mode applying an address latching the address applying data and applying a programming pulse Each word is programmed com- pletely before moving on to the next and is followed by a verification step The following is a list of the pins used for programming and a description of their functions Pin Function XTAL 1 2 Clock Inputs Reset Initialization and Address Latching Test 0 Selection of Program or Verify Mode EA Activation of ProgramVerify Signature RowSecurity Bit Modes BUS Address and Data Input Data Output During Verify P20–22 Address Input VDD Programming Power Supply PROG Program Pulse Input WARNING An attempt to program a missocketed 8741AH or 8742AH will result in severe damage to the part An indication of a properly socketed part is the appearance of the SYNC clock output The lack of this clock may be used to disable the programmer The ProgramVerify sequence is 1 CS e 5V VCC e 5V VDD e 5V RESET e 0V A0 e 0V TEST 0 e 5V clock applied or internal oscillator operating BUS floating PROG e 5V 2 Insert 8741AH or 8742AH in programming socket 3 TEST 0 e 0V (select program mode) 4 EA e 125V (active program mode) 5 VCC e 6V (programming supply) 6 VDD e 125V (programming power) 7 Address applied to BUS and P20–22 8 RESET e 5V (latch address) 9 Data applied to BUS 10 PROG e 5V followed by one 1 ms pulse to 0V 11TEST 0 e 5V (verify mode) 12 Read and verify data on BUS 13 TEST 0 e 0V 14 Apply overprogram pulse 15 RESET e 0V and repeat from step 6 16 Programmer should be at conditions of step 1 when 8741AH or 8742AH is removed from socket Please follow the inteligent Programming flow chart for proper programming procedure inteligent Programming Algorithm The inteligent Programming Algorithm rapidly pro- grams Intel 8741AH8742AH EPROMs using an effi- cient and reliable method particularly suited to the production programming environment Typical pro- gramming time for individual devices is on the order of 10 seconds Programming reliability is also en- sured as the incremental program margin of each byte is continually monitored to determine when it has been successfully programmed A flowchart of the 8741AH8742AH inteligent Programming Algo- rithm is shown in Figure 9 The inteligent Programming Algorithm utilizes two different pulse types initial and overprogram The duration of the initial PROG pulse(s) is one millisec- ond which will then be followed by a longer overpro- gram pulse of length 3X msec X is an iteration coun- ter and is equal to the number of the initial one milli- second pulses applied to a particular 8741AH 8742AH location before a correct verify occurs Up to 25 one-millisecond pulses per byte are provided for before the overprogram pulse is applied 6 |
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