dp8473 National Semiconductor Corporation, dp8473 Datasheet - Page 25

• Manufacturer Part Number: dp8473
• Description: Dp8473 Floppy Disk Controller Plus-2
• Manufacturer: National Semiconductor Corporation

AC Electrical Characteristics
DRIVE WRITE TIMING
Note 11 Whenever WGATE is asserted the WDATA line is active At the end of each write one dummy byte is written before WGATE is deasserted
DRIVE TRACK ACCESS TIMING
Symbol
t
t
t
WD
HDS
HDH
Symbol
t
t
t
t
t
DST
DH
STP
IW
DRV
Write Data Pulse Width
Head Select Setup to Write Gate Assertion
Head Select Hold from Write Gate
Direction Setup prior to Step
Direction Hold from End of Step
Step Pulse Width
Index Pulse Width
Drive Select or Motor Time from Write Strobe
Parameter
Parameter
(Continued)
25
250 kb s (MFM)
300 kb s (MFM)
500 kb s (MFM)
1000 kb s(MFM)
Conditions
1 step time
Min
100
6
8
Min
500
416
250
225
50
15
Max
100
TL F 9384 – 16
Max
TL F 9384 – 17
Units
ms
ms
Units
ns
ns
ms
ms
ns
ns
ns
ns