SCH3112I-NE SMSC [SMSC Corporation], SCH3112I-NE Datasheet - Page 69

• Manufacturer Part Number: SCH3112I-NE
• Description: LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
• Manufacturer: SMSC [SMSC Corporation]

LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
Datasheet
SMSC SCH311X
SYMBOL
H/HDS
HLT
HUT
LOCK
MFM
MT
N
NCN
ND
OW
PCN
POLL
PRETRK
R
RCN
SC
NAME
Head Address
Head Load Time
Head Unload
Time
MFM/FM Mode
Selector
Multi-Track
Selector
Sector Size
Code
New Cylinder
Number
Non-DMA Mode
Flag
Overwrite
Present Cylinder
Number
Polling Disable
Precompensatio
n Start Track
Number
Sector Address
Relative Cylinder
Number
Number of
Sectors Per
Track
Table 7.14 Description of Command Symbols (continued)
DESCRIPTION
Selected head: 0 or 1 (disk side 0 or 1) as encoded in the sector ID field.
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.
This specifies the number of bytes in a sector. If this parameter is "00", then
the sector size is 128 bytes. The number of bytes transferred is determined by
the DTL parameter. Otherwise the sector size is (2 raised to the "N'th" power)
times 128. All values up to "07" hex are allowable. "07"h would equal a sector
size of 16k. It is the user's responsibility to not select combinations that are
not possible with the drive.
N SECTOR SIZE
00 128 Bytes
01 256 Bytes
02 512 Bytes
03 1024 Bytes
…
07 16K Bytes
The desired cylinder number.
Write ‘0’. This part does not support non-DMA mode.
The bits D0-D3 of the Perpendicular Mode Command can only be modified if
OW is set to 1. OW id defined in the Lock command.
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.
The time interval that FDC waits after loading the head and before initializing a
DATASHEET
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53
Rev 0.2 (09-28-04)