LPC47M172_07 SMSC [SMSC Corporation], LPC47M172_07 Datasheet - Page 54

• Manufacturer Part Number: LPC47M172_07
• Description: Advanced I/O Controller with Motherboard GLUE Logic
• Manufacturer: SMSC [SMSC Corporation]

Advanced I/O Controller with Motherboard GLUE Logic
Datasheet
SMSC/Non-SMSC Register Sets (Rev. 01-11-07)
DS0, DS1
SYMBOL
D0, D1
H/HDS
EFIFO
LOCK
MFM
EOT
GAP
HUT
GPL
DTL
HLT
DIR
EIS
MT
EC
C
D
Cylinder Address The currently selected address; 0 to 255.
Disk Drive Select
Direction Control
Head Load Time
Drive Select 0-1
MFM/FM Mode
Enable Implied
Special Sector
Head Address
Enable Count
Head Unload
Data Pattern
Enable FIFO
End of Track
Gap Length
Multi-Track
Selector
Selector
NAME
Seek
Time
Size
Table 6.16 - Description of Command Symbols
The pattern to be written in each sector data field during formatting.
Designates which drives are perpendicular drives on the
Perpendicular Mode Command. A “1” indicates a perpendicular
drive.
If this bit is 0, then the head will step out from the spindle during a
relative seek. If set to a 1, the head will step in toward the spindle.
By setting N to zero (00), DTL may be used to control the number
of bytes transferred in disk read/write commands. The sector size
(N = 0) is set to 128. If the actual sector (on the diskette) is larger
than DTL, the remainder of the actual sector is read but is not
passed to the host during read commands; during write commands,
the remainder of the actual sector is written with all zero bytes. The
CRC check code is calculated with the actual sector. When N is
not zero, DTL has no meaning and should be set to FF HEX.
When this bit is “1” the “DTL” parameter of the Verify command
becomes SC (number of sectors per track).
This active low bit when a 0, enables the FIFO. A “1” disables the
FIFO (default).
When set, a seek operation will be performed before executing any
read or write command that requires the C parameter in the
command phase. A “0” disables the implied seek.
The final sector number of the current track.
Alters Gap 2 length when using Perpendicular Mode.
The Gap 3 size. (Gap 3 is the space between sectors excluding
the VCO synchronization field).
Selected head: 0 or 1 (disk side 0 or 1) as encoded in the sector ID
field.
The time interval that FDC waits after loading the head and before
initializing a read or write operation. Refer to the Specify command
for actual delays.
The time interval from the end of the execution phase (of a read or
write command) until the head is unloaded. Refer to the Specify
command for actual delays.
Lock defines whether EFIFO, FIFOTHR, and PRETRK parameters
of the CONFIGURE COMMAND can be reset to their default values
by a “software Reset”. (A reset caused by writing to the appropriate
bits of either the DSR or DOR)
A one selects the double density (MFM) mode. A zero selects
single density (FM) mode.
When set, this flag selects the multi-track operating mode. In this
mode, the FDC treats a complete cylinder under head 0 and 1 as a
single track. The FDC operates as this expanded track started at
the first sector under head 0 and ended at the last sector under
head 1. With this flag set, a multitrack read or write operation will
automatically continue to the first sector under head 1 when the
FDC finishes operating on the last sector under head 0.
DATASHEET
DS1
0
0
Page 54
DS0
0
1
DESCRIPTION
DRIVE
Drive 0
Drive 1
SMSC LPC47M172