LSI Logic Confidential
AC Timing
18-35
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
18.2.10 IR Interface Timing
DMN-8600 has two IR modules: one with full-duplex operation (TX and
RX), and one with TX-only functionality. The DMN-8600 IR modules
offload most of the formatting and protocol issues to software; for
transmit, the IR module generates waveforms with the programmed
pulse length and period characteristics, while for receive, it simply
measures the period and duty cycle of incoming pulses.
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.
Waveforms for two common protocols, NCR and Philips RC-5, are also
shown below.
Figure 18.28 IR Interface Timing
SIO_IRTX (O)
T
1
T
2
T
3
T
4
T
5
T
7
T
6
Carrier Waveform
(Internal Signal)
Sysclk
Receive Tick Waveform
(Internal Signal)
SIO_IRRX (I)
Содержание DMN-8600
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