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PC87373 数据表(PDF) 141 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件名 PC87373
功能描述  LPC SuperI/O with Glue Functions
PDF  174 Pages
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

PC87373 数据表(HTML) 141 Page - National Semiconductor (TI)

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12.0 Legacy Functional Blocks (Continued)
141
www.national.com
Revision 1.1
12.1.2 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.
06h
N/A
X
07h
DIR
Digital Input
R
CCR
Configuration Control
W
1. From the 8-byte aligned FDC base address.
Table 53. 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
Table 52. FDC Register Map
Offset1
Mnemonic
Register Name
Type



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