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SCD1283 Datasheet(PDF) 48 Page - Intel Corporation |
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SCD1283 Datasheet(HTML) 48 Page - Intel Corporation |
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48 / 94 page  CD1283 — IEEE 1284-Compatible Parallel Interface 48 Datasheet useful in slow systems that cannot guarantee that the CPU can check the register after it is cleared or before it is loaded with the revision code. This procedure is also used as part of a diagnostic test suite. The device completes internal initialization within 500 µsec. A timer (software or hardware) detects when the operation is not completed within that time and cues if the device is functional. Figure 15. Flow Diagram of the CD1283 Master Initialization Sequence GFRCR = 0 ? ISSUE RESET COMMAND N Y GFRCR = 25* ? N Y CONTINUE INIT PROCESS * REVISION CODE FOR REVISION E DEVICE = 25 FUTURE REVISIONS, IF RCR = 0 ? N Y THIS BY ONE; FOR EXAMPLE, REVISION F WOULD BE 26, ETC. NECESSARY, WILL INCREMENT CLEAR GFRCR |
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