Nco ip core signals, Nco ip core signals -10 – Altera NCO MegaCore Function User Manual
Page 27
and valid signals. Avalon-ST interfaces can also support more complex protocols for burst and packet
transfers with packets interleaved across multiple channels. The Avalon-ST interface inherently synchro‐
nizes multichannel designs, which allows you to achieve efficient, time-multiplexed implementations
without having to implement complex control logic.
Avalon-ST interfaces support backpressure, which is a flow control mechanism where a sink can signal to
a source to stop sending data. The sink typically uses backpressure to stop the flow of data when its FIFO
buffers are full or when it has congestion on its output.
Related Information
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NCO IP Core Signals
Table 3-6: NCO IP Core Signals
Signal
Directio
n
Description
address[2:0]
Input
Address of the 16 phase increment registers when frequency
hopping is enabled.
clk
Input
Clock.
clken
Input
Active-high clock enable.
freq_mod_i [F-
1:0]
Input
Optional frequency modulation input. You can specify the
modulator resolution F in IP Toolbench.
freq_sel[log
2
N-
1:0]
input
Use to select one of the phase increment registers (that is to
select the hopping frequencies), when frequency hopping is
enabled. N is the depth.
phase_mod_i [P-
1:0]
Input
Optional phase modulation input. You can specify the
modulator precision P in Ithe wizard.
phi_inc_i [A-1:0]
Input
Input phase increment. You can specify the accumulator
precision A in the wizard.
reset_n
Input
Active-low asynchronous reset.
write_sig
Input
Active-high write signal when frequency hopping is enabled.
in_data
Output In Qsys systems, this Avalon-ST-compliant data bus includes all
the Avalon-ST input data signals.
fcos_o [M-1:0]
Output Optional output cosine value (when dual output is selected). You
can specify the magnitude precision M in IP Toolbench.
fsin_o [M-1:0]
Output Output sine value. You can specify the magnitude precision M in
IP Toolbench.
out_valid
Output Data valid signal. Asserted by the MegaCore function when there
is valid data to output.
out_data
Output In Qsys systems, this Avalon-ST-compliant data bus includes all
the Avalon-ST output data signals.
3-10
NCO IP Core Signals
UG-NCO
2014.12.15
Altera Corporation
NCO IP Core Functional Description