LSI Logic Confidential
SIO Register Descriptions
15-53
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
RTP
Receive Tick Period
30:16
This register determines the tick period used by the IR
receiver. The tick period provides the basic time unit for
the receive tick counter and is reset to 7032 sysclk
cycles.
The actual tick period is given by RTP[14:0] + 1.
IR1 Receive Filter Register (IR1_RFR)
Offset = 0xBF0018
Read/Write
Default = 0x0053 0000
This register holds the upper and lower limits for the receive pulse high
width filter as well as the polarity select for the IR receive signal
SIO_IRRX.
P
IR RX Signal Polarity
24
This bit sets the input signal (SIO_IRRX) polarity.
1 = SIO_IRRX is active low and RTC reports the time
between rising edges of SIO_IRRX, while RPH reports
the time that IRRX is low.
0 = SIO_IRRX is active high and RTC reports the time
between falling edges of SIO_IRRX, while RPH reports
the time that SIO_IRRX is high.
This bit is set to zero on reset.
Filt_H
IR RX Start Pulse Filter Upper Limit
23:20
This 4-bit value is matched against the upper 4 bits of the
8-bit tick count value to determine when a start pulse is
too large, and therefore is not considered valid. This
value has no effect if the Filter Start Pulse bit in the IR
Receive Tick Count register is set to zero.
15
0
RSVD
31
25
24
23
20
19
16
RSVD
P
Filt_H
Filt_L
15
0
RSVD
Содержание DMN-8600
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