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PC8374L Datasheet(PDF) 193 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # PC8374L
Description  SensorPathTM SuperI/O with Glue Functions
PDF  239 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC8374L Datasheet(HTML) 193 Page - National Semiconductor (TI)

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9.0 Legacy Functional Blocks (Continued)
Revision 1.1
193
www.national.com
Table 62 lists the FDC functional block registers. All registers are VDD3 powered.
9.1.2
FDC Bitmap Summary
The FDC supports two system operation modes: PC-AT mode and PS/2 mode. Unless specifically indicated otherwise, all
fields in all registers are valid in both operation modes.
Table 62. FDC Register Map
Offset1
1. From the 8-byte aligned FDC base address.
Mnemonic
Register Name
Type
00h
SRA
Status A
RO
01h
SRB
Status B
RO
02h
DOR
Digital Output
R/W
03h
TDR
Tape Drive
R/W
04h
MSR
Main Status
R
DSR
Data Rate Select
W
05h
FIFO
Data (FIFO)
R/W
06h
N/A
X
07h
DIR
Digital Input
R
CCR
Configuration Control
W
Table 63. FDC Bitmap Summary
Register
Bits
Offset
Mnemonic
76543210
00h
SRA1
1. Applicable only in PS/2 Mode.
IRQ
Pending
Reserved
Step
TRK0
Head
Select
INDEX
WP
Head
Direction
01h
SRB1
Reserved
Drive
Select 0
Status
WDATA
RDATA
WGATE
MTR1
MTR0
02h
DOR
Reserved
Motor
Enable 1
Motor
Enable 0
DMAEN
Reset
Controller
Drive Select
03h
TDR
Reserved
Tape Drive Select 1,0
TDR2
2. Applicable only in Enhanced TDR Mode.
Reserved (must be 1111)
Logical Drive
Exchange
Tape Drive Select 1,0
04h
MSR
RQM
Data I/O
Direction
Non-DMA
Execution
Command
in
Progress
Reserved
Drive 1
Busy
Drive 0
Busy
DSR
Software
Reset
Low Power
Reserved
Precompensation Delay Select
Data Transfer Rate
Select
05h
FIFO
Data Bits
07h
DIR3
3. Applicable only in PC-AT Compatible Mode.
DSKCHG
Reserved
DIR1
DSKCHG
Reserved
DRATE 1,0 Status
High
Density
07h
CCR
Reserved
DRATE1,0
Winbond Electronics Corp. Advanced PC Product Center



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