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W83977EF-AW Datasheet(PDF) 40 Page - Winbond |
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W83977EF-AW Datasheet(HTML) 40 Page - Winbond |
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40 / 142 page  W83977EF-AW/W83977EG-AW -38- S/W RESET (Bit 7): This bit is the software reset bit. POWER-DOWN (Bit 6): 0 FDC in normal mode 1 FDC in power-down mode PRECOMP2 PRECOMP1 PRECOMP0 (Bit 4, 3, 2): These three bits select the value of write precompensation. The following tables show the precompensation values for the combination of these bits. PRECOMP PRECOMPENSATION DELAY 2 1 0 250K - 1 Mbps 2 Mbps Tape drive 0 0 0 Default Delays Default Delays 0 0 1 41.67 nS 20.8 nS 0 1 0 83.34 nS 41.17 nS 0 1 1 125.00 nS 62.5nS 1 0 0 166.67 nS 83.3 nS 1 0 1 208.33 nS 104.2 nS 1 1 0 250.00 nS 125.00 nS 1 1 1 0.00 nS (disabled) 0.00 nS (disabled) DATA RATE DEFAULT PRECOMPENSATION DELAYS 250 KB/S 125 nS 300 KB/S 125 nS 500 KB/S 125 nS 1 MB/S 41.67nS 2 MB/S 20.8 nS |
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