W83977ATF Datasheet, PDF (38/207 Pages) Winbond – WINBOND I/O

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W83977ATF
PRELIMINARY
S/W RESET (Bit 7):
This bit is the software reset bit.
DRATE0
DRATE1
PRECOMP0
PRECOMP1
PRECOMP2
POWER DOWN
S/W RESET
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
210
000
001
010
011
100
101
110
111
PRECOMPENSATION DELAY
250K - 1 Mbps
2 Mbps Tape drive
Default Delays
41.67 nS
Default Delays
20.8 nS
83.34 nS
41.17 nS
125.00 nS
62.5nS
166.67 nS
83.3 nS
208.33 nS
250.00 nS
104.2 nS
125.00 nS
0.00 nS (disabled)
0.00 nS (disabled)
DATA RATE
250 KB/S
300 KB/S
500 KB/S
1 MB/S
2 MB/S
DEFAULT PRECOMPENSATION DELAYS
125 nS
125 nS
125 nS
41.67nS
20.8 nS
Publication Release Date: April 1998
-37 -
Revision 0.52