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FDC37N972 Datasheet(PDF) 79 Page - SMSC Corporation

Part # FDC37N972
Description  Advanced Notebook I/O Controller with Enhanced Keyboard Control and System Management
Download  390 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

FDC37N972 Datasheet(HTML) 79 Page - SMSC Corporation

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When the FDC is disabled, powered down or inactive the FDC output pins will tri-state allowing ‘hot-
swapping’ of the Floppy Disk Drive.
The following table lists the five control/configuration
mechanisms that power down or deactivate the FDC logical device.
TABLE 47 - FDC HOT SWAPPING MECHANISMS
MECHANISM
FDC OUTPUT PINS STATE
Tri-
State
Tri-State
Tri-State
Tri-State
(Note 1)
Tri-State
(Note 2)
FDC Logical Dev Activate bit
=0: FDC LD deactivated
=1: FDC LD activated
Refer to the description of the
FDC Logical Device
Configuration register 0x30 in
the Configuration section of the
FDC37N972 Specification.
0
X
1
1
1
FDC Logical Dev Base Address
0x100 < Base < 0x0FF8:
FDC LD Base Address Valid.
0xFFF < Base < 0x100:
FDC LD Base Address Invalid.
Refer to the description of the
FDC Base I/O Address
registers in the Configuration
section of the FDC37N972
Specification.
X
INVALID
BASE
ADDRESS
VALID
BASE
ADDRESS
VALID
BASE
ADDRESS
VALID
BASE
ADDRESS
GCR 0x22 bit-0 (FDC Power)
=0: Power Off
=1: Power On
Refer to the description of the
Global Config Register 0x22 in
the Configuration section of the
FDC37N972 Specification.
X
X
0
1
1
DSR, bit-6 (pwr down)
=0: Normal Run
=1: Manual Pwr down
Refer to the description of the
DSR in the FDC section of any
SMSC Super or Ultra I/O data
sheet.
X
X
X
1
0


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