w83877atd Winbond Electronics Corp America, w83877atd Datasheet - Page 38

• Manufacturer Part Number: w83877atd
• 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
DATA RATE
PRECOM
2
0
0
0
1
1
1
0
1
250 KB/S
300 KB/S
500 KB/S
1 MB/S
2 MB/S
1
0
0
1
0
1
1
1
0
0
0
1
1
1
0
1
0
0
DEFAULT PRECOMPENSATION DELAYS
7
0.00 nS (disabled)
Default Delays
250K - 1Mbps
6
125.00 nS
166.67 nS
208.33 nS
250.00 nS
41.67 nS
83.34 nS
5
0
4
PRECOMPENSATION DELAY
3
41.67 nS
20.8 nS
125 nS
125 nS
125 nS
2
1
- 34 -
0
DRATE0
DRATE1
PRECOMP0
PRECOMP1
PRECOMP2
POWER DOWN
S/W RESET
2 Mbps Tape drive
0.00nS (disabled)
Publication Release Date: April 1998
Default Delays
125.00nS
41.17nS
104.2nS
20.8nS
62.5nS
83.3nS
W83877ATF
Version 0.51