w83977atf Winbond Electronics Corp America, w83977atf Datasheet - Page 38
w83977atf
Manufacturer Part Number
w83977atf
Description
Winbond I/o
Manufacturer
Winbond Electronics Corp America
Datasheet
1.W83977ATF.pdf
(207 pages)
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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
DATA RATE
2
0
0
0
0
1
1
1
1
250 KB/S
300 KB/S
500 KB/S
1 MB/S
2 MB/S
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
7
6
5
0
0.00 nS (disabled)
DEFAULT PRECOMPENSATION DELAYS
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
-37 -
PRECOMPENSATION DELAY
2
1
41.67nS
20.8 nS
0
125 nS
125 nS
125 nS
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
W83977ATF
PRELIMINARY
Revision 0.52
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