37M602 Datasheet, PDF (132/182 Pages) SMSC Corporation – ENHANCED SUPER I/O CONTROLLER WITH INFRARED SUPPORT

LOGICAL DEVICE
REGISTER
Interrupt Select
Defaults :
0x70 = 0x00,
on Vcc POR or
Reset_Drv
0x72 = 0x00,
on Vcc POR or
Reset_Drv
DMA Channel Select
Default = 0x04
on Vcc POR or
Reset_Drv
32-Bit Memory Space
Configuration
Logical Device
Logical Device
Configuration
Reserved
Table 55 - Logical Device Registers
ADDRESS
(0x70,0x72)
DESCRIPTION
0x70 is implemented for each logical device.
Refer to Interrupt Configuration Register
description. Only the keyboard controller
uses Interrupt Select register 0x72. Unused
register (0x72) will ignore writes and return
zero when read. Interrupts default to edge
high (ISA compatible).
STATE
C
(0x71,0x73) Reserved - not implemented. These register
locations ignore writes and return zero when
read.
(0x74,0x75) Only 0x74 is implemented for FDC, Serial
C
Port 2 and Parallel port. 0x75 is not
implemented and ignores writes and returns
zero when read. Refer to DMA Channel
Configuration.
(0x76-0xA8) Reserved - not implemented. These register
locations ignore writes and return zero when
read.
(0xA9-0xDF) Reserved - not implemented. These register
C
locations ignore writes and return zero when
read.
(0xE0-0xFE) Reserved - Vendor Defined (see SMSC
C
defined Logical Device Configuration
Registers).
0xFF
Reserved
C
Note 1: A logical device will be active and powered up according to the following equation:
DEVICE ON (ACTIVE) = (Activate Bit SET or Pwr/Control Bit SET).
The Logical device's Activate Bit and its Pwr/Control Bit are linked such that setting or clearing one
sets or clears the other. If the I/O Base Addr of the logical device is not within the Base I/O range as
shown in the Logical Device I/O map, then read or write is not valid and is ignored.
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