W83627DHG Datasheet, PDF (247/268 Pages) Winbond – WINBOND LPC I/O

W83627DHG
21.3.7 Floppy Disk Drive Timing
FDC: Data rate = 1MB, 500KB, 300KB, 250KB/sec.
PARAMETER
SYM.
MIN.
DIR# setup time to STEP#
TDST
1.0/1.6
/2.0/4.0
DIR# hold time from STEP#
TSTD
24/40
/48/96
STEP# pulse width
TSTP
6.8/11.5
/13.8/27.8
STEP# cycle width
TSC
NOTE 2
INDEX# pulse width
TIDX
125/250
/417/500
RDATA# pulse width
TRD
40
WD# pulse width
TWD
100/185
/225/475
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.)
TYP.
(NOTE 1)
7/11.7
/14/28
NOTE 2
125/210
/250/500
MAX.
7.2/11.9
/14.2/28.2
NOTE 2
150/235
/275/525
UNIT
µS
µS
µS
mS
nS
nS
nS
DATA RATE
SRT
0
1
…
E
F
Step Rate Table
1MB/S
500KB/S
8
16
7.5
15
…
…
1.0
2
0.5
1
300KB/S
26.7
25
…
3.33
1.67
250KB/S
32
30
…
4
2
Floppy Disk Driving Timing
-235-
Publication Release Date: Aug, 22, 2007
Version 1.4