Altera Reed-Solomon II MegaCore Function Manual de usuario descargar pdf (Pagina 23)

Parameter Legal Values Default Value Description

Error bits count

format

Full or split Full Specifies full or split count:

• With full count the decoder just counts

the number of received error bit

• With split count the decoder counts the

number of received error bits with

initial value "1" (then corrects to value

"0") and outputs num_error_bit1 . It

also counts the number of received

error bits with initial value "0" (then

corrects to the value "1") and outputs

num_error_bit0

Reed-Solomon II IP Core Interfaces and Signals

The RS II Avalon-ST interface supports backpressure, which is a flow control mechanism, where a sink

can indicate to a source to stop sending data.

The ready latency on the Avalon-ST input interface is 0; the number of symbols per beat is fixed to 1.

The clock and reset interfaces drive or receive the clock and reset signal to synchronize the Avalon-ST

interfaces and provide reset connectivity. The status interface is a conduit interface that consists of three

error status signals for a codeword. The decoder obtains the error symbol value, number of error symbols,

and number of error bits in a codeword from the status signals.

Avalon-ST Interfaces in DSP IP Cores

Avalon-ST interfaces define a standard, flexible, and modular protocol for data transfers from a source

interface to a sink interface.

The input interface is an Avalon-ST sink and the output interface is an Avalon-ST source. The Avalon-ST

interface supports packet transfers with packets interleaved across multiple channels.

Avalon-ST interface signals can describe traditional streaming interfaces supporting a single stream of

data without knowledge of channels or packet boundaries. Such interfaces typically contain data, ready,

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

• Avalon Interface Specifications

Reed-Solomon II IP Core Signals

UG-01090

2015.05.01

Reed-Solomon II IP Core Interfaces and Signals

3-7

Reed-Solomon II IP Core Functional Description

Altera Corporation

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