LPC47M107S-MS Standard Microsystems (SMSC), LPC47M107S-MS Datasheet - Page 28

• Manufacturer Part Number: LPC47M107S-MS
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LPC47M107S-MS

• Pin Count: 100
• Lead Free Status / RoHS Status: Compliant

MAIN STATUS REGISTER
Address 3F4 READ ONLY
The Main Status Register is a read-only register and indicates the status of the disk controller. The Main Status Register
can be read at any time. The MSR indicates when the disk controller is ready to receive data via the Data Register. It
should be read before each byte transferring to or from the data register except in DMA mode. No delay is required
when reading the MSR after a data transfer.
BIT 0 - 1 DRV x BUSY
These bits are set to 1s when a drive is in the seek portion of a command, including implied and overlapped seeks and
recalibrates.
BIT 4 COMMAND BUSY
This bit is set to a 1 when a command is in progress. This bit will go active after the command byte has been accepted
and goes inactive at the end of the results phase. If there is no result phase (Seek, Recalibrate commands), this bit is
returned to a 0 after the last command byte.
BIT 5 NON-DMA
This mode is selected in the SPECIFY command and will be set to a 1 during the execution phase of a command. This
is for polled data transfers and helps differentiate between the data transfer phase and the reading of result bytes.
BIT 6 DIO
Indicates the direction of a data transfer once a RQM is set. A 1 indicates a read and a 0 indicates a write is required.
BIT 7 RQM
Indicates that the host can transfer data if set to a 1. No access is permitted if set to a 0.
DT1
0
1
0
1
RQM
7
DT0
0
0
1
1
DIO
6
Table 10 - Default Precompensation Delays
DRVDEN1 (1)
DRATE0
DRATE0
DRATE0
DRATE1
DATA RATE
NON
DMA
500 Kbps
300 Kbps
250 Kbps
2 Mbps
1 Mbps
5
Table 9 - DRVDEN Mapping
BUSY
CMD
4
Page 28
DRVDEN0 (1)
nDENSEL
DENSEL
DRATE1
DRATE0
PRECOMPENSATION
Reserved Reserved
3
DELAYS
41.67 ns
20.8 ns
125 ns
125 ns
125 ns
4/2/1 MB 3.5"
2/1 MB 5.25" FDDS
2/1.6/1 MB 3.5" (3-MODE)
PS/2
2
DRIVE TYPE
BUSY
DRV1
1
DRV0
BUSY
0