LSI Logic Confidential
SIO Register Descriptions
15-25
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
This setting ([P2:P0])=01x) applies a rotating priority to
the DMA Channels. In this mode, the DMA channel that
is currently being serviced is assigned the lowest priority,
and the immediate next channel is assigned the highest
priority.
Fixed Priority
In fixed priority mode ([P2:P0])=1xx), the target module
with the lowest ID number is always given the highest pri-
ority.
Initially, DMA channel 1 (SPI transmit, SPI_TX) has the
highest priority, and DMA channel 11 (infrared “blaster” 2,
IR2_TX) has the lowest (
explains the channel
numbers). This can be changed to programmable priority,
fixed priority, or rotating priority.
TGT_ID
Target Module ID
7:0
Legal values for the target ID are shown in
SIO Top Level Module Interrupt Status Register (SIO_IRQ_STATUS)
Offset = 0xBF0140
Read/Write
Default = 0x0000 0000
This register, depending on the value of the corresponding bit in the SIO
Top Level Module Interrupt Enable register, records each of the interrupt
signals generated by the various peripheral modules in the SIO.
Table 15.5
Legal Target ID Values
SPI_TX = 0x1
UART1_TX = 0x5
IR1_TX = 0x9
SPI_RX = 0x2
UART1_RX = 0x6
IR1_RX = 0xA
UART2_TX = 0x7
IR2_TX = 0xB
UART2_RX = 0x8
31
16
RSVD
15
9
8
7
6
5
4
3
2
1
0
RSVD
IR2T
IR1R
IR1T
UA2I
UA1I
IDCI
SPIC RSVD ACT
Содержание DMN-8600
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