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PC87334VLJ 데이터시트(PDF) 32 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 PC87334VLJ
상세설명  SuperI/O 3.3V/5V Floppy Disk Controller, Dual UARTs, Infrared, IEEE1284 Parallel Port, and IDE Interface
PDF  102 Pages
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87334VLJ 데이터시트(HTML) 32 Page - National Semiconductor (TI)

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30 FDC Register Description (Continued)
D4 5
Drive ID01
(For Enhanced mode)
Bits 4 and 5 are read only bits which hold the val-
ues of pins DRID01
D3 2
Bits 3 and 2 are readwrite bits that control logical
drive exchange
When working in four drive encoded mode (bit 4 of
FER is 1) the logical drive exchange is not per-
formed
00 No logical drive exchange
01 Logical drive exchange between drives 0 and 1
as selected by bit 4 of FCR
10 Logical drive exchange between drives 0 and 2
This bit allows software to exchange the physi-
cal floppy disk control signals assigned to drive
0 and 2 Under these conditions the DR0
DR23 and MTR0 pin functions are as follows
DR2 internal signal to DR0 pin
MTR2 internal signal to MTR0 pin
DR0 internal signal to DR23 pin
Note
Drive 3 is not exchanged at the same time as Drive 2
11 Reserved Unpredictable results when 11 is
configured
D1 0
Tape Select 10
These bits assign a logical drive
number to a tape drive Drive 0 is not available as a
tape drive and is reserved as the floppy disk boot
drive See Table 3-4 for the tape drive assignment
values
TABLE 3-4 Media ID Bit Functions
Bit 7
Bit 6
Bit 5
Media Type
X
X
1
Invalid Data
0
0
0
525
0
1
0
288M
1
0
0
144M
1
1
0
720k
TABLE 3-5 Tape Drive Assignment Values
TAPESEL1
TAPESEL0
Drive
Selected
0
0
None
01
1
10
2
11
3
TABLE 3-3 TDR Operation Modes
Mode
FCR
ASC
TDR
D7
D6
D5
D4
D3
D2
D1
D0
Bit 0
Bit 2
Bit
Compatible AT TDR
10
DESC
XX
X
X
X
X
TAPE
TAPE
SEL 1
SEL 0
RESET
NA
NA
NA
NA
NA
NA
0
0
COND
Automatic Media Sense
00
DESC
ED
HD
VALID
XX
X
TAPE
TAPE
DATA
SEL 1
SEL 0
RESET
NA
NA
NA
NA
NA
NA
0
0
COND
Enhanced
or
1
0
1
DESC
ED
HD
DRID1
DRID0
SWP1
SWP0
TAPE
TAPE
SEL 1
SEL 0
RESET
NA
NA
NA
NA
0
0
0
0
COND
32



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