SCH3112I-NE SMSC [SMSC Corporation], SCH3112I-NE Datasheet - Page 301

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

LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
Datasheet
SMSC SCH311X
FDD Mode Register
Default = 0x0E
on VCC POR,
VTR POR and
PCI RESET
FDD Option Register
Default = 0x00
on VCC POR,
VTR POR and
PCI RESET
FDD Type Register
Default = 0xFF
on VCC POR,
VTR POR and
PCI RESET
FDD0
Default = 0x00
on VCC POR,
VTR POR and
PCI RESET
FDD1
NAME
Table 25.10 Floppy Disk Controller, Logical Device 0 [Logical Device Number = 0X00
REG INDEX
0xF0 R/W
0xF1 R/W
0xF2 R/W
0xF4 R/W
0xF5 R/W
0xF3 R
Bit[0] Floppy Mode
Bit[1] FDC DMA Mode
= 0 Burst Mode is enabled
= 1 Non-Burst Mode (default)
Bit[3:2] Interface Mode
= 11 AT Mode (default)
= 10 (Reserved)
= 01 PS/2
= 00 Model 30
Bit[4] Reserved (read/write bit)
Bit[5] Reserved, set to zero
Bit[6] FDC Output Type Control
= 0 FDC outputs are OD12 open drain (default)
= 1 FDC outputs are O12 push-pull
Bit[7] FDC Output Control
= 0 FDC outputs active (default)
= 1 FDC outputs tri-stated
Bit[0] Forced Write Protect
= 0 Inactive (default)
= 1 FDD nWRTPRT input is forced active when either of the drives
has been selected.
nWRTPRT (to the FDC Core) = WP (FDC SRA register, bit 1) =
(nDS0 AND Forced Write Protect) OR (nDS1 AND Forced Write
Protect) OR nWRTPRT (from the FDD Interface) OR Floppy Write
Protect
Notes:
■
■
Bit[1] Reserved
Bits[3:2] Density Select
= 00 Normal (default)
= 01 Normal (reserved for users)
= 10 1 (forced to logic “1”)
= 11 0 (forced to logic “0”)
Bit[7:4] Reserved. (read/write bits)
Bits[1:0] Floppy Drive A Type
Bits[3:2] Floppy Drive B Type
Bits[5:4] Reserved (could be used to store Floppy Drive C type)
Bits[7:6] Reserved (could be used to store Floppy Drive D type)
Note:
Reserved, Read as 0 (read only)
Bits[1:0] Drive Type Select: DT1, DT0
Bits[2 Read as 0 (read only)
Bits[4:3] Data Rate Table Select: DRT1, DRT0
Bits[5] Read as 0 (read only)
Bits[6] Precompensation Disable PTS
=0 Use Precompensation
=1 No Precompensation
Bits[7] Read as 0 (read only)
Refer to definition and default for 0xF4
= 0 Normal Floppy Mode (default)
= 1 Enhanced Floppy Mode 2 (OS2)
DATASHEET
The Floppy Write Protect bit is in the Device Disable register.
Boot floppy is always drive 0.
285
The SCH311X supports two floppy drives
DEFINITION
Rev 0.2 (09-28-04)