SCH3112I-NE SMSC [SMSC Corporation], SCH3112I-NE Datasheet - Page 56

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

APPLICATION NOTE: Note that in this device since only drive 0 is supported, the tape sel0/1 bits must be set to
Rev 0.2 (09-28-04)
REG 3F3
REG 3F3
TAPE SEL1
(TDR.1)
Bit 6 MOTOR ENABLE 2
The MTR2 disk interface output is not supported in the SCH311X.
Bit 7 MOTOR ENABLE 3
The MTR3 disk interface output is not supported in the SCH311X.
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.
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’
Note only drive 0 is supported.
ENHANCED FLOPPY MODE 2 (OS2)
Register 3F3 for Enhanced Floppy Mode 2 operation.
Note only drive 0 is supported
DB7
0
DB7
Reserved
0
0
1
1
Table 7.3
0b00 for proper operation.
DB6
0
DB6
Reserved
illustrates the Tape Select Bit encoding. Note that drive 0 is the boot device and
DB5
0
DB5
Drive Type ID
Table 7.3 Tape Select Bits
TAPE SEL0
(TDR.0)
DATASHEET
0
1
0
1
LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
DB4
0
DB4
40
DB3
0
DB3
Floppy Boot Drive
DRIVE SELECTED
None
1 (not supported)
2 (not supported)
3 (not supported)
DB2
0
DB2
DB1
tape sel1
DB1
tape sel1
SMSC SCH311X
DB0
tape sel0
DB0
tape sel0
Datasheet