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W83627DHG
Publication Release Date: Aug, 22, 2007
-235- Version
1.4
21.3.7 Floppy Disk Drive Timing
FDC: Data rate = 1MB, 500KB, 300KB, 250KB/sec.
PARAMETER SYM.
MIN.
TYP.
(NOTE 1)
MAX. UNIT
DIR# setup time to STEP#
T
DST
1.0/1.6
/2.0/4.0
µ
S
DIR# hold time from STEP#
T
STD
24/40
/48/96
µ
S
STEP# pulse width
T
STP
6.8/11.5
/13.8/27.8
7/11.7
/14/28
7.2/11.9
/14.2/28.2
µ
S
STEP# cycle width
T
SC
NOTE 2
NOTE 2
NOTE 2
mS
INDEX# pulse width
T
IDX
125/250
/417/500
nS
RDATA# pulse width
T
RD
40
nS
WD# pulse width
T
WD
100/185
/225/475
125/210
/250/500
150/235
/275/525
nS
Notes:
1.
Typical values for T = 25
°
C and normal supply voltage.
2.
Programmable from 0.5 mS through 32 mS as described in step rate table.
(Please refer to the description of the SPECIFY command set.)
Step Rate Table
DATA RATE
SRT
1MB/S 500KB/S
300KB/S
250KB/S
0 8
16
26.7
32
1 7.5
15
25
30
… …
…
…
…
E 1.0
2
3.33
4
F 0.5
1
1.67
2
Floppy Disk Driving Timing
Summary of Contents for W83627DHG
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