Altera CIC MegaCore Function - Manual (Page 27)

CIC IP Core Signals
Table 3-4: CIC IP Core Signals
Signal Directio
n
Description
av_st_in_data
Output In Qsys systems, this Avalon-ST-compliant data bus includes all
the Avalon-ST input data signals. For multi-interface designs
Interface 0 is in the MSB; Interface N is the LSB.
clk
Input Clock signal for all internal registers.
clken
Input Optional top-level clock enable.
reset_n
Input Active low reset signal. You must always reset the CIC MegaCore
function before receiving data. If not, the CIC filter may produce
unexpected results because of feedback signals.
in_data
Input Sample input. For multiple input cases, the input data ports are
in0_data
,
in1_data
, and so on.
in_endofpacket
Input Marks the end of the incoming sample group. For N channels, the
end of packet signal must be high when the sample belonging to
the last channel, channel N-1, is presented at
in_data
.
in_error
Input Error signal indicating Avalon-ST protocol violations on input
side:
• 00: No error
• 01: Missing start of packet
• 10: Missing end of packet
• 11: Unexpected end of packet
Other types of error are also marked as 11.
in_ready
Output Indicates when the IP core can accept data.
in_startof-
packet
Input Marks the start of the incoming sample group. The start of packet
is interpreted as a sample from channel 0.
in_valid
Input Asserted when data at
in_data
is valid. When
in_valid
is not
asserted, processing is stopped until valid is re-asserted. If
clken
is
0,
in_valid
is not be asserted.
av_st_out_data
Output In Qsys systems, this Avalon-ST-compliant data bus includes all
the Avalon-ST output data signals. For multi-interface designs
Interface 0 is in the MSB; Interface N is the LSB.
out_channel
Output Specifies the channel whose result is presented at
out_data
.
out_data
Output Filter output. The data width depends on the parameter settings.
For multiple output cases, the output data ports are named as
out0_data
,
out1_data
, and so on.
UG-CIC
2014.12.15
CIC IP Core Signals 3-11
CIC IP Core Functional Description Altera Corporation
Send Feedback