Altera Embedded Peripherals IP - Manual (Page 179)

Parameter Legal Values Description
Use almost-full
threshold 1
—
Turn on these parameters to implement the optional
Avalon-ST almost-full and almost-empty interfaces and
their corresponding registers. See Control Interface
Register Map for the description of the threshold
registers.
Use almost-full
threshold 2
—
Use almost-empty
threshold 1
—
Use almost-empty
threshold 2
—
Use almost-full
threshold 1
0 or 1 This threshold indicates that the FIFO is almost full. It is
enabled when the parameter Number of almost-full
threshold is set to 1 or 2.
Use almost-full
threshold 2
0 or 1 This threshold is an initial indication that the FIFO is
getting full. It is enabled when the parameter Number of
almost-full threshold is set to 2.
Use almost-empty
threshold 1
0 or 1 This threshold indicates that the FIFO is almost empty. It
is enabled when the parameter Number of almost-
empty threshold is set to 1 or 2.
Use almost-empty
threshold 2
0 or 1 This threshold is an initial indication that the FIFO is
getting empty. It is enabled when the parameter Number
of almost-empty threshold is set to 2.
Software Programming Model
The following sections describe the software programming model for the Avalon-ST Multi-Channel
Shared FIFO core.
HAL System Library Support
The Altera-provided driver implements a HAL device driver that integrates into the HAL system library
for Nios II systems. HAL users should access the Avalon-ST Multi-Channel Shared FIFO core via the
familiar HAL API and the ANSI C standard library.
Register Map
You can configure the thresholds and retrieve the fill-level for each channel via the Avalon-MM control
and fill-level interfaces respectively. Subsequent sections describe the registers accessible via each
interface.
17-6 Software Programming Model
UG-01085
2014.24.07
Altera Corporation Avalon-ST Multi-Channel Shared Memory FIFO Core
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