LSI Logic Confidential
SIO Register Descriptions
15-51
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
E
Transmit Enable
26
1 = Load the current transmit modulated waveform, the
period high value, and the pulse high value into the out-
put counters after the current waveform has completed.
This bit is automatically reset to zero after the waveform
is loaded.
MSP
Modulated Signal Period
25:16
The MSP value specifies the modulated signal period in
units of carrier pulses. The period is given by:
period = (MSPR[9:0]+1)(carrier wave period)
This register is sufficiently large to support the 9 ms pulse
required for the start bit in the NEC format.
IR1 Modulated Signal Pulse Low Register (IR1_MSPL)
IR2 Modulated Signal Pulse Low Register (IR2_MSPL)
Offset = 0xBF000C / 0xBF008C
Read/Write
Default = 0x0000 0000
This register is one of two registers that is written to produce a bit stream
output. Since the IR1_MSPR contains the enable bit that initiates the
transmission, that register must be written last.
Pulse_Low_Len
23:16
This register specifies the low pulse width in units of car-
rier pulses. The period is given by:
period = (MSPL[7:0]+1)(carrier wave period).
This register is sufficient to provide a 4.5 ms pulse, the
largest low pulse width required by existing IR standards.
31
24
23
16
RSVD
Pulse_Low_Len
15
0
RSVD
Содержание DMN-8600
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