LPC47M182 SMSC Corporation, LPC47M182 Datasheet - Page 44

• Manufacturer Part Number: LPC47M182
• Description: ADVANCED I/O CONTROLLER WITH MOTHERBOARD GLUE LOGIC
• Manufacturer: SMSC Corporation

6.4.6
Revision 1.8 SMSC/Non-SMSC Register Sets (02-24-05)
REG 3F3
REG 3F3 Reserved Reserved
Note:
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 6.5
illustrates the Tape Select Bit encoding. Note that drive 0 is the boot device and cannot be assigned tape
support.
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.
L0-CRF2-Bx = FDC Logical Device, Configuration Register F2, Bit x.
DIGITAL OUTPUT REGISTER
The remaining Tape Drive Register bits TDR.[7:2] are tristated when read.
DB7
DB7
0
Bit 1
0
0
1
1
DB6
DB6
TAPE SEL1
0
(TDR.1)
0
0
1
1
Table 6.6 - Drive Type ID
Bit 0
Table 6.5 - Tape Select Bits
0
1
0
1
DATASHEET
DB5
DB5
Drive Type ID
0
TAPE SEL0
(TDR.0)
DB4
DB4
44
0
1
0
1
0
L0-CRF2 – B1
L0-CRF2 – B3
L0-CRF2 – B5
L0-CRF2 – B7
REGISTER 3F3 – DRIVE TYPE ID
Bit 5
Floppy Boot Drive
DB3
DB3
0
SELECTED
DRIVE
None
1
2
3
Advanced I/O Controller with Motherboard GLUE Logic
DB2
DB2
L0-CRF2 – B0
L0-CRF2 – B2
L0-CRF2 – B4
L0-CRF2 – B6
0
Bit 4
tape sel1
tape sel1
DB1
DB1
tape sel0
tape sel0
SMSC LPC47M182
DB0
DB0
The TDR is
Datasheet