Altera CIC MegaCore Function Manuale Utente Scaricare il pdf (Pagina 29)

The multiple symbols per beat scenario applies to both the sink interface on MISO CIC filters and the

source interface of SIMO CIC filters. All other interfaces operate with a single symbol per beat, but the

interfaces also support multiple channels using packets.

Figure 3-8: Packet Data TransferFour symbols are transferred on each beat. The data transfer occurs on

cycles 1, 2, 4, and 5, when both ready and valid are asserted.

0 1 2 3

00 00 00 00

1 2 3 4

6 7

clk

ready

valid

startofpacket

endofpacket

channel[1:0]

data[31:24]

data[23:16]

data[15:8]

data[7:0]

error[1:0]

During cycle 1, the CIC IP core asserts startofpacket, and transfers the first four bytes of packet. During

cycle 5, the CIC IP core asserts endofpacket indicating that this is the end of the packet. The channel

signal indicates the channel index associated with the data. For example, on cycle 1, the data D

, D

and D

associated with channel 0 are available.

UG-CIC

2014.12.15

Packet Data Transfers

3-13

CIC IP Core Functional Description

Altera Corporation

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Altera CIC MegaCore Function Manuale Utente Pagina 29