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LPC47M112 Datasheet(PDF) 31 Page - SMSC Corporation

Part No. LPC47M112
Description  ENHANCED SUPER I/O CONTROLLER WITH LPC INTERFACE
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Maker  SMSC [SMSC Corporation]
Homepage  http://www.smsc.com
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 31 page
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Enhanced Super I/O Controller with LPC Interface
Datasheet
SMSC DS – LPC47M112
Page 31
Rev. 02/02/2005
DATASHEET
Table 5 - Internal 2 Drive Decode - Drives 0 and 1 Swapped
DIGITAL OUTPUT REGISTER
DRIVE SELECT OUTPUTS
(ACTIVE LOW)
MOTOR ON OUTPUTS
(ACTIVE LOW)
Bit 7
Bit 6
Bit 5
Bit 4
Bit1
Bit 0
nDS1
nDS0
nMTR1
nMTR0
X
X
X
1
0
0
0
1
nBIT 4
nBIT 5
X
X
1
X
0
1
1
0
nBIT 4
nBIT 5
X
1
X
X
1
0
1
1
nBIT 4
nBIT 5
1
X
X
X
1
1
1
1
nBIT 4
nBIT 5
0
0
0
0
X
X
1
1
nBIT 4
nBIT 5
Normal Floppy Mode
Normal mode. Register 3F3 contains only bits 0 and 1. When this register is read, bits 2 - 7 are ‘0’
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
REG 3F3
0
0
0
0
0
0
tape sel1
tape sel0
Enhanced Floppy Mode 2 (OS2)
Register 3F3 for Enhanced Floppy Mode 2 operation.
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
REG 3F3 Reserved Reserved
Drive Type ID
Floppy Boot Drive
tape sel1
tape sel0
Table 6 - Drive Type ID
DIGITAL OUTPUT REGISTER
REGISTER 3F3 - DRIVE TYPE ID
Bit 1
Bit 0
Bit 5
Bit 4
0
0
L0-CRF2 - B1
L0-CRF2 - B0
0
1
L0-CRF2 - B3
L0-CRF2 - B2
1
0
L0-CRF2 - B5
L0-CRF2 - B4
1
1
L0-CRF2 - B7
L0-CRF2 - B6
Note:
L0-CRF2-Bx = Logical Device 0, Configuration Register F2, Bit x.
DATA RATE SELECT REGISTER (DSR)
Address 3F4 WRITE ONLY
This register is write only. It is used to program the data rate, amount of write precompensation, power down status, and
software reset. The data rate is programmed using the Configuration Control Register (CCR) not the DSR, for PC/AT
and PS/2 Model 30.
Other applications can set the data rate in the DSR. The data rate of the floppy controller is the most recent write of
either the DSR or CCR. The DSR is unaffected by a software reset. A hardware reset will set the DSR to 02H, which
corresponds to the default precompensation setting and 250 Kbps.
7
6
5
4
3
2
1
0
S/W
RESET
POWER
DOWN
0
PRE-
COMP2
PRE-
COMP1
PRE-
COMP0
DRATE
SEL1
DRATE
SEL0
RESET
COND.
0
0
0
0
0
0
1
0




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