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PC97338 датащи(PDF) 174 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали PC97338
подробное описание детали  ACPI 1.0 and PC98/99 Compliant SuperI/O
PDF  221 Pages
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производитель  NSC [National Semiconductor (TI)]
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B3-0 MPW [3–0] – MIR Signal Pulse Width
TABLE 89. MIR Pulse Width Settings
B7-4 Reserved.
Write 0's.
5.20.3 SIR_PW – SIR Pulse Width
Register
This register determines the width of the transmitted
SIR infrared pulses.
The programmed value has no effect on the SIR re-
ceiver. After reset, the content of this register is 0.
FIGURE 88. SIR Pulse Width Register
5.20.4 LCR/BSR – Link Control/Bank
Select Registers
These registers are the same as in bank 0.
5.20.5 BFPL – Beginning Flags/Preamble
Length Register
Used to program the number of beginning flags and
preamble symbols for MIR and FIR modes respec-
tively.
After reset, the content of this register is 2Ah, select-
ing 2 beginning flags and 16 preamble symbols.
FIGURE 88. Beginning Flags/Preamble Length
Register
TABLE 90. FIR Preamble Length
ENCODING
Pulse Width
MDRS = 0
Pulse Width
MDRS = 1
00XX
Reserved
Reserved
0100
83.33 ns
166.66 ns
0101
104.16 ns
208.33 ns
0110
125 ns
250 ns
0111
145.83 ns
291.66 ns
1000
166.66 ns
333.33 ns
1001
187.50 ns
374.99 ns
1010
208.33 ns
416.66 ns
1011
229.16 ns
458.33
1100
250 ns
500 ns
1101
270.83 ns
541.66 ns
1110
291.66 ns
583.32 ns
1111
312.5 ns
625 ns
B3-0 SPW [3-0] – SIR Signal Pulse Width.
Encoding
Pulse Width
0000
3/16 of bit time
1101
1.6
µs
Other encodings are reserved and will select a
pulse width of 1.6
µs.
B7-4 Reserved.
Write 0's.
7
654
321
0
Reset
Required
0
0
0
0
0
0
0
0
0
0
0
0
SPW(3-0)
Reserved
B3–0 FPL [3–0] – FIR Preamble Length.
Selects the number of preamble symbols for
FIR frames.
ENCODING
Preamble Length
0000
Reserved
0001
1
0010
2
0011
3
0100
4
0101
5
0110
6
0111
8
1000
10
1001
12
1010
16 (Default)
1011
20
1100
24
1101
28
1110
32
1111
Reserved
B7–4 MBF [3–0] – MIR Beginning Flags.
Selects the number of beginning flags for MIR
frames.
7
6
5
432
10
Reset
Required
0
1
0
1
0
1
0
0
FPL(3-0)
MBF(7-4)



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