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PC87338 Datenblatt(PDF) 75 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Teilenummer PC87338
Bauteilbeschribung  ACPI 1.0 and PC98/99 Compliant SuperI/O
PDF  221 Pages
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Hersteller  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87338 Datenblatt(HTML) 75 Page - National Semiconductor (TI)

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3.3.2
Status Register A (SRA),
Offset 000
Status Register A (SRA) monitors the state of the
IRQ6 signal and some of the disk interface signals.
SRA is a read-only register that is valid only in PS/2
mode.
SRA can be read at any time while PS/2 mode is ac-
tive. In PC-AT mode, all bits are in TRI-STATE during
a microprocessor read.
FIGURE 45. SRA Register Bitmap
Bit 0 - Head Direction
This bit indicates the direction of the head of the
Floppy Disk Drive (FDD). Its value is the inverse of
the value of the DIR interface output signal.
0 - DIR is not active, i.e., the head of the FDD
steps outward. (Default)
1 - DIR is active, i.e., the head of the FDD steps
inward.
Bit 1 - Write Protect (WP)
This bit indicates whether or not the selected Flop-
py Disk Drive (FDD) is write protected. Its value re-
flects the status of the WP disk interface input
signal.
76
54
321
0
Reset
Required
0
0
0
0
0
0
0
0
Main Status
Register (MSR)
Offset 100
Drive 2 Busy
Non-DMA Execution
Data I/O Direction
RQM
Drive 1 Busy
Drive 3 Busy
Command in Progress
Drive 0 Busy
76
54
321
0
Reset
Required
0
1
0
0
0
0
0
0
Data Rate Select
Register (DSR)
Offset 100
Precompensation Delay Select
Undefined
Low Power
Software Reset
DRATE1
DRATE0
76
54
321
0
Reset
Required
Data Register
(FIFO)
Offset 101
Data
76
54
321
0
Reset
Required
1
1
1
1
1
Digital Input
Register (DIR)
Offset 111
DRATE1 Status
DSKCHG
DRATE0 Status
Reserved
High Density
PS/2 Mode
Only
76
54
321
0
Reset
Required
0
1
0
0
0
0
0
0
Configuration Control
Register (CCR)
Offset 111
Reserved
DRATE1
DRATE0
76
54
321
0
Reset
Required
0
0
0
0
Status Register
A (SRA)
Offset 000
INDEX
TRK0
Step
DRV2
IRQ6 Pending
Head Direction
WP
Head Select



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