FDC37B77X SMSC Corporation, FDC37B77X Datasheet - Page 141

• Manufacturer Part Number: FDC37B77X
• Description: ENHANCED SUPER I/O CONTROLLER WITH WAKE UP FEATURES
• Manufacturer: SMSC Corporation

Logical
Registers [0x30-0xFF]
Used to access the registers that are assigned
to each logical unit. This chip supports nine
logical units and has nine sets of logical device
registers. The six logical devices are Floppy,
Parallel, Serial 1, Serial 2, Keyboard Controller,
and Auxiliary_I/O.
control and configuration registers exists for
Activate
Default = 0x00
on Vcc POR or
Reset_Drv
Logical Device Control
Logical Device Control
Memory Base Address
I/O Base Address
(see Device Base I/O
Address Table)
Default = 0x00
on Vcc POR or
Reset_Drv
LOGICAL DEVICE
REGISTER
Note1, Note 3
Device
Note 2
A separate set (bank) of
Configuration/Control
(0x40-0x5F)
(0x60-0x6F)
(0x31-0x37)
(0x38-0x3f)
0x60,2,... =
0x61,3,... =
ADDRESS
addr[15:8]
addr[7:0]
(0x30)
Table 55 - 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.
base address is required, the second base
address is set by registers 0x62 and 0x63.
Refer to Table 64 for the number of base
address registers used by each device.
Unused registers will ignore writes and return
zero when read.
= 1
141
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
If more than one
STATE
C
C
C
C
C