LSI Logic Confidential
15-2
Serial I/O Port
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
Since there is no generic IR protocol which can be described, the
waveforms shown below illustrate how the values read/written from
various IR registers relate to the actual waveforms themselves. (The
circled numbers shown in
correspond to the numbers shown
in
.)
Waveforms for two common protocols, NCR and Philips RC-5, are shown
in the following sections.
Figure 15.1 IR Interface Protocol
SIO_IRRX
sysclk
SIO_IRTX
Receive Tick
Carrier
(Internal Signal)
(Input)
(Output)
Waveform
Waveform
1
2
4
3
(Internal Signal)
5
7
6
Table 15.1
IR Waveform/Register Value Relationship
Reference
Parameter
Description
Minimum
Maximum
sysclk
System Clock
81 MHz
150 Mhz
1
MSPR
IRTX Modulated Signal Pulse:
User can program overall period of IRTX
waveform, in units of carrier wave cycles
0x0 + 1
carrier
cycles
0x3ff + 1
carrier
cycles
2
MSPL
IRTX Modulated Signal Pulse Low:
User can program duty cycle of IRTX
waveform, in units of carrier wave cycles
0x0 + 1
carrier
cycles
0xff + 1
carrier
cycles
Содержание DMN-8600
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