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W83977EF-AW Datasheet(PDF) 94 Page - Winbond |
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W83977EF-AW Datasheet(HTML) 94 Page - Winbond |
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94 / 142 page  W83977EF-AW/W83977EG-AW -92- CRF2 (Default 0xFF) Bit 7 - 6: FDD D Drive Type Bit 5 - 4: FDD C Drive Type Bit 3 - 2: FDD B Drive Type Bit 1:0: FDD A Drive Type When FDD is in enhanced 3-mode(CRF0.bit0=1),these bits determine SELDEN value in TABLE A of CRF4 and CRF5 as follows. DTYPE1 DPYTE0 DRATE1 DRATE0 SELDEN 0 0 1 1 1 0 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 1 X X 0 1 0 X X 1 1 1 0 1 0 Note: X means don't care. CRF4 (Default 0x00) FDD0 Selection: Bit 7: Reserved. Bit 6: Precomp. Disable. = 1 Disable FDC Precompensation. = 0 Enable FDC Precompensation. Bit 5: Reserved. Bit 4 - 3: DRTS1, DRTS0: Data Rate Table select (Refer to TABLE A). = 00 Select Regular drives and 2.88 format = 01 Specifical application = 10 2 Meg Tape = 11 Reserved Bit 2: Reserved. Bit 1:0: DMOD0, DMOD1 : Drive Model select (Refer to TABLE B). |
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