W83977EF Winbond Electronics Corp America, W83977EF Datasheet - Page 45

• Manufacturer Part Number: W83977EF
• Description: Description = W83877TF Plus Kbc, GP I/O, Wake-Up, Power Fail Resume ;; Package = QFP 128
• 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
0
0
0
0
1
1
1
1
DATA RATE
250 KB/S
300 KB/S
500 KB/S
1
0
0
1
1
0
0
1
1
1 MB/S
2 MB/S
0
0
1
0
1
0
1
0
1
7
6
5
0
0.00 nS (disabled)
Default Delays
250K - 1 Mbps
4
DEFAULT PRECOMPENSATION DELAYS
125.00 nS
166.67 nS
208.33 nS
250.00 nS
41.67 nS
83.34 nS
3
-39 -
PRECOMPENSATION DELAY
2
1
0
41.67nS
20.8 nS
125 nS
125 nS
125 nS
DRATE0
DRATE1
PRECOMP0
PRECOMP1
PRECOMP2
POWER DOWN
S/W RESET
Publication Release Date: April 2003
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
W83977EF
Revision 1.1