LPC47B272-MS SMSC, LPC47B272-MS Datasheet - Page 26

• Manufacturer Part Number: LPC47B272-MS
• Description: IC CTRLR SUPER I/O LPC 100-QFP
• Manufacturer: SMSC

Specifications of LPC47B272-MS

• Controller Type: I/O Controller
• Interface: LPC
• Voltage - Supply: 3.3V
• Current - Supply: 15mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1019

TAPE DRIVE REGISTER (TDR)
Address 3F3 READ/WRITE
The Tape Drive Register (TDR) is included for 82077 software compatibility and allows the user to assign tape support
to a particular drive during initialization. Any future references to that drive automatically invokes tape support. The TDR
Tape Select bits TDR.[1:0] determine the tape drive number. Table 3 illustrates the Tape Select Bit encoding. Note that
drive 0 is the boot device and cannot be assigned tape support. The remaining Tape Drive Register bits TDR.[7:2] are
tristated when read. The TDR is unaffected by a software reset.
Normal Floppy Mode
Normal mode. Register 3F3 contains only bits 0 and 1. When this register is read, bits 2 - 7 are ‘0’.
Enhanced Floppy Mode 2 (OS2)
Register 3F3 for Enhanced Floppy Mode 2 operation.
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.
SMSC LPC47B27x
REG 3F3
REG 3F3 Reserved Reserved
Note:
DB7
DB7
Bit 5
0
X
1
0
L0-CRF2-Bx = Logical Device 0, Configuration Register F2, Bit x.
DIGITAL OUTPUT
DIGITAL OUTPUT REGISTER
Bit 4
REGISTER
X
1
0
Bit 1
0
0
1
1
DB6
DB6
Table 5 - Internal 2 Drive Decode - Drives 0 and 1 Swapped
0
Bit1
X
0
0
TAPE SEL1
(TDR.1)
Bit 0
DB5
DB5
0
1
X
Drive Type ID
0
Table 6 - Drive Type ID
0
0
1
1
Bit 0
0
1
0
1
DRIVE SELECT OUTPUTS
Table 3 - Tape Select Bits
DATASHEET
nDS1
DB4
DB4
0
1
1
(ACTIVE LOW)
0
TAPE SEL0
(TDR.0)
- 26 -
0
1
0
1
L0-CRF2 - B1
L0-CRF2 - B3
L0-CRF2 - B5
L0-CRF2 - B7
REGISTER 3F3 - DRIVE TYPE ID
Floppy Boot Drive
DB3
DB3
0
nDS0
Bit 5
1
0
1
SELECTED
DRIVE
None
DB2
DB2
0
1
2
3
MOTOR ON OUTPUTS
nMTR1
nBIT 4
nBIT 4
nBIT 4
(ACTIVE LOW)
L0-CRF2 - B0
L0-CRF2 - B2
L0-CRF2 - B4
L0-CRF2 - B6
tape sel1
tape sel1
DB1
DB1
Bit 4
Rev. 04-17-07
nMTR0
nBIT 5
nBIT 5
nBIT 5
tape sel0
tape sel0
DB0
DB0