FDC37M81x SMSC Corporation, FDC37M81x Datasheet - Page 143

• Manufacturer Part Number: FDC37M81x
• Description: PC98/99 Compliant Enhanced Super I/O Controller
• Manufacturer: SMSC Corporation

Logical
Registers [0x30-0xFF]
Used to access the registers that are assigned to
each logical unit. This chip supports six logical
units and has six sets of logical device registers.
The six logical devices are Floppy, Parallel, Serial
1, Serial 2, Keyboard Controller, and Auxiliary_I/O.
registers
A separate set (bank) of control and configuration
Activate (Note 1)
Default = 0x00
on VCC POR, VTR POR,
SOFT RESET and HARD
RESET
Logical Device Control
Logical Device Control
Memory Base Address
I/O Base Address
(Note 2)
(see Device Base I/O
Address Table)
Default = 0x00
on VCC POR, VTR POR,
SOFT RESET and HARD
RESET
LOGICAL DEVICE
REGISTER
Device
exists
Configuration/Control
(0x40-0x5F)
(0x60-0x6F)
(0x31-0x37)
(0x38-0x3f)
ADDRESS
0x60,2,... =
0x61,3,... =
addr[15:8]
addr[7:0]
(0x30)
Table 54 - Logical Device Registers
Bits[7:1] Reserved, set to zero.
Bit[0]
= 0
Reserved - Writes are ignored, reads return 0.
Vendor Defined - Reserved - Writes are
ignored, reads return 0.
Reserved - Writes are ignored, reads return 0.
Registers 0x60 and 0x61 set the base address
for the device. If more than one base address
is required, the second base address is set by
registers 0x62 and 0x63.
Refer to Table 63 for the number of base
address registers used by each device.
Unused registers will ignore writes and return
zero when read.
= 1
for
143
Activates the logical device currently
selected through the Logical Device #
register.
Logical device currently selected is
inactive
each logical device and is selected with the Logical
Device # Register (0x07).
The INDEX PORT is used to select a specific
logical device register. These registers are then
accessed through the DATA PORT.
The Logical Device registers are accessible only
when the device is in the Configuration State. The
logical register addresses are shown in the table
below.
DESCRIPTION
STATE
C
C
C
C
C