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AM28F020A-90FC 데이터시트(PDF) 13 Page - Advanced Micro Devices |
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AM28F020A-90FC 데이터시트(HTML) 13 Page - Advanced Micro Devices |
13 / 35 page Am28F020A 13 Embedded Programming Algorithm The Embedded Program Setup is a command only op- eration that stages the device for automatic program- ming. Embedded Program Setup is performed by writing 10h or 50h to the command register. Once the Embedded Setup Program operation is per- formed, the next WE# pulse causes a transition to an active programming operation. Addresses are latched on the falling edge of CE# or WE# pulse, whichever happens later. Data is latched on the rising edge of WE# or CE#, whichever happens first. 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 ade- quate internally generated program pulse and verify margin. The automatic programming operation is completed when the data on DQ7 is equivalent to data written to this bit (see Write Operation Status section) at which time the device returns to Read mode. Figure 2 and Table 5 illustrate the Embedded Program algorithm, a typical command string, and bus operation. Table 5. Embedded Programming Algorithm Note: See AC and DC Characteristics for values of VPP parameters. The VPP power supply can be hard-wired to the device or switchable. When VPP is switched, VPPL may be ground, no connect with a resistor tied to ground, or less than VCC + 2.0 V. Refer to Functional Description. Device is either powered-down, erase inhibit or program inhibit. Bus Operations Command Comments Standby Wait for VPP Ramp to VPPH (see Note) Write Embedded Program Setup Command Data = 10h or 50h Write Embedded Program Command Valid Address/Data Read Data # Polling to Verify Completion Read Available for Read Operations START Apply VPPH Write Embedded Setup Program Command Write Embedded Program Command (A/D) Programming Completed Yes Data# Poll Device Increment Address No 17502D-7 Figure 2. Embedded Programming Algorithm Last Address |
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