FDC37N869 View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
FDC37N869
SMSC -> Microchip
'FDC37N869' PDF : 147 Pages View PDF
SYMBOL
SK
SRT
ST0
ST1
ST2
ST3
WGATE
NAME
DESCRIPTION
Skip Flag
When set to “1”, sectors containing a deleted data address mark will
automatically be skipped during the execution of Read Data. If Read
Deleted is executed, only sectors with a deleted address mark will be
accessed. When set to “0”, the sector is read or written the same as
the read and write commands.
Step Rate Interval The time interval between step pulses issued by the FDC.
Programmable from 0.5 to 8 milliseconds in increments of 0.5 ms at
the 1 Mbit data rate. Refer to the SPECIFY command for actual delays.
Status 0
Status 1
Status 2
Status 3
Registers within the FDC which store status information after a
command has been executed. This status information is available to
the host during the result phase after command execution.
Write Gate
Alters timing of WE to allow for pre-erase loads in perpendicular drives.
Instruction Set
PHASE
Command
Execution
Result
Table 33 - Instruction Set
READ DATA
DATA BUS
R/W D7 D6 D5 D4 D3 D2 D1 D0
REMARKS
W MT MFM SK 0 0 1 1 0 Command Codes
W 0 0 0 0 0 HDS DS1 DS0
W
- - - - - - - - C- - - - - - - -
Sector ID information prior to
Command execution.
W
- - - - - - - - H- - - - - - - -
W
- - - - - - - - R- - - - - - - -
W
- - - - - - - - N- - - - - - - -
W
- - - - - - - EOT - - - - - - -
W
- - - - - - - GPL - - - - - - -
W
- - - - - - - DTL - - - - - - -
Data transfer between the
FDD and system.
R
- - - - - - - ST0 - - - - - - -
Status information after
Command execution.
R
- - - - - - - ST1 - - - - - - -
R
- - - - - - - ST2 - - - - - - -
R
- - - - - - - - C- - - - - - - -
Sector ID information after
Command execution.
R
- - - - - - - - H- - - - - - - -
R
- - - - - - - - R- - - - - - - -
R
- - - - - - - - N- - - - - - - -
SMSC DS – FDC37N869
Page 38
Rev. 11/09/2000
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