Altera Embedded Peripherals IP Instrukcja Użytkownika Strona 202

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32-bit
Word
Offset
Register Name Reset
Value
Description
base +
1
version 1 Indicate the hardware version number. Only
being used by software driver for software
backward compatibility purpose.
base +
4
control 0 This register specifies the core’s behavior such
as what triggers an interrupt and when the core
is started and stopped. The host processor can
configure the core by setting the register bits
accordingly. See the Control Register Bit Map
table for the control register map.
base +
8
next_descriptor_pointer 0 This register contains the address of the next
descriptor to process. Set this register to the
address of the first descriptor as part of the
system initialization sequence.
Altera recommends that user applications clear
the RUN bit in the control register and wait
until the BUSY bit of the status register is set to
0 before reading this register.
Table 21-7: Control Register Bit Map
Bit Bit Name Access Description
0 IE_ERROR R/W When this bit is set to 1, the core generates an
interrupt if an Avalon-ST error occurs during
descriptor processing. (1)
1 IE_EOP_ENCOUNTERED R/W When this bit is set to 1, the core generates an
interrupt if an EOP is encountered during
descriptor processing. (1)
2 IE_DESCRIPTOR_COMPLETED R/W When this bit is set to 1, the core generates an
interrupt after each descriptor is processed. (1)
3 IE_CHAIN_COMPLETED R/W When this bit is set to 1, the core generates an
interrupt after the last descriptor in the list is
processed, that is when the core encounters a
descriptor with a cleared OWNED_BY_HW bit. (1)
4 IE_GLOBAL R/W When this bit is set to 1, the core is enabled to
generate interrupts.
UG-01085
2014.24.07
Register Maps
21-11
Scatter-Gather DMA Controller Core
Altera Corporation
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