W83977A Winbond Electronics Corp America, W83977A Datasheet - Page 43

• Manufacturer Part Number: W83977A
• Description: Winbond I/O
• 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
PRECOMP
2 1 0
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
7
6
5
0
0.00 nS (disabled)
Default Delays
250K - 1 Mbps
4
125.00 nS
166.67 nS
208.33 nS
250.00 nS
41.67 nS
83.34 nS
3
PRECOMPENSATION DELAY
-35 -
2
1
0
DRATE0
DRATE1
PRECOMP0
PRECOMP1
PRECOMP2
POWER DOWN
S/W RESET
Publication Release Date: April 1998
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
W83977TF
PRELIMINARY
Revision 0.62