w83977eg Winbond Electronics Corp America, w83977eg Datasheet - Page 40

• Manufacturer Part Number: w83977eg
• Description: Winbond Isa I/o W83977ef W83977eg
• Manufacturer: Winbond Electronics Corp America

S/W RESET (Bit 7):
This bit is the software reset bit.
POWER-DOWN (Bit 6):
0
1
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.
FDC in normal mode
FDC in power-down mode
DATA RATE
250 KB/S
300 KB/S
500 KB/S
1 MB/S
2 MB/S
PRECOMP
2
0
0
0
0
1
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0.00 nS (disabled)
W83977EF-AW/W83977EG-AW
Default Delays
DEFAULT PRECOMPENSATION DELAYS
250K - 1 Mbps
125.00 nS
166.67 nS
208.33 nS
250.00 nS
41.67 nS
83.34 nS
-38-
PRECOMPENSATION DELAY
41.67nS
20.8 nS
125 nS
125 nS
125 nS
2 Mbps Tape drive
0.00 nS (disabled)
Default Delays
125.00 nS
41.17 nS
104.2 nS
20.8 nS
83.3 nS
62.5nS