GM82C803CN Datasheet, PDF (79/84 Pages) List of Unclassifed Manufacturers – 2.88 MB FDC/ Dual UARTs with FIFO/PIO(EPP/ ECP)/ IDE Interface/ S-IR/ PnP

GM82C803CN
5-3.8 Drive Write Timing
Symbol
Parameter
tWD
Write Data Pulse Width
tHDS
Head Select Setup to Write Assertion
tHDH
Head Select Hold from WGATE
Condition
Min Max Units
250 kb/s (MFM) 500
ns
40
us
12
us
300 kb/s (MFM) 416
ns
500 kb/s (MFM) 250
ns
1000 kb/s (MFM) 125
ns
Note 1 : Whenever WGATE is asserted the WDATA line is active. At the end of each write one dummy byte
is written before WGATE is deasserted.
HDSEL
WGATE
tHDS
(NOTE1)
WDATA
tWD
5-3.9 Drive Track Access Timing
tHDH
(NOTE1)
Symbol
tDH
tDRV
tDST
tIW
tSTP
Parameter
Direction Hold from End of Step
Drive Select or Motor Time from Write Strobe
Direction Setup prior to Step
Index Pulse Width
Step Pulse Width
Min
Max
1 Step Time
100
6
100
6
Units
ns
us
ns
us
INDEX
WR
DS0~1, MTR0~1
tIW
tDRV
tDRV
DIR
tDST
tDH
STEP
Programmable
tSTP