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AM28F020 데이터시트(PDF) 18 Page - Advanced Micro Devices |
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AM28F020 데이터시트(HTML) 18 Page - Advanced Micro Devices |
18 / 35 page 18 Am28F020 Figure 4. AC Waveforms for Programming Operations ANALYSIS OF PROGRAM TIMING WAVEFORMS Program Setup/Program Two-cycle write commands are required for program operations (section A and B). The first program com- mand (40h) is a Setup command and does not affect the array data (section A).The second program com- mand latches address and data required for program- ming on the falling and rising edge of WE# respectively (section B). The rising edge of this WE# pulse (section B) also initiates the programming pulse. The device is programmed on a byte by byte basis either sequentially or randomly. The program pulse occurs in section C. Time-Out A software timing routine (10 µs duration) must be initi- ated on the rising edge of the WE# pulse of section B. Note: An integrated stop timer prevents any possibility of overprogramming by limiting each time-out period of 10 µs. Program-Verify Upon completion of the program timing routine, the mi- croprocessor must write the program-verify command (C0h). This command terminates the programming op- eration on the rising edge of the WE# pulse (section D). The program-verify command also stages the device for data verification (section F). Another software timing Addresses CE # OE # WE # Data VPP VCC 11559G-9 Data In 20h Section A0h Data Out Bus Cycle Write Write Time-out Write Time-out Read Standby Command 40h Program Address, Program Data N/A C0h (Stops Program) N/A Compare Data N/A Function Program Setup Program Command Latch Address and Data Program (10 µs) Program Verify Transition (6 µs) Program Verification Proceed per Programming Algorithm AB D E F CG A B DE F CG |
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