37C957FR Datasheet, PDF (58/328 Pages) SMSC Corporation – ULTRA I/O CONTROLLER FOR PORTABLE APPLICATIONS

SYMBOL
PCN
POLL
PRETRK
R
RCN
SC
SK
SRT
ST0
ST1
ST2
ST3
WGATE
NAME
Present Cylinder
Number
Polling Disable
Precompensation
Start Track
Number
Sector Address
Relative Cylinder
Number
Number of
Sectors Per
Track
Skip Flag
Step Rate
Interval
Status 0
Status 1
Status 2
Status 3
Write Gate
DESCRIPTION
The current position of the head at the completion of Sense
Interrupt Status command.
When set, the internal polling routine is disabled. When
clear, polling is enabled.
Programmable from track 00 to FFH.
The sector number to be read or written. In multi-sector
transfers, this parameter specifies the sector number of the
first sector to be read or written.
Relative cylinder offset from present cylinder as used by the
Relative Seek command.
The number of sectors per track to be initialized by the
Format command. The number of sectors per track to be
verified during a Verify command when EC is set.
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.
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.
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.
Alters timing of WE to allow for pre-erase loads in
perpendicular drives.
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