Lattice Semiconductor
Table 2-3. Top Level I/O Interface (Continued)
Functional Description
pp0
pp1
Port
Bits
1-12
1-12
I/O
I
I
Description
Puncture pattern 0 of the convolutional code for next block. This port is available
only in dynamic puncturing mode.
Puncture pattern 1 of the convolutional code for next block. This port is available
only in dynamic puncturing mode.
Puncture rate and puncture pattern set signal. The new input rate, output rate
ppset
1
I
and puncture patterns are set when ppset goes high. This port is available only
in dynamic puncturing mode.
dout
outvalid
obvalid
ber
1
1
1
16
O
O
O
O
Output decoded data.
Output valid signal. This indicates the output on dout is a valid decoded value.
Output block valid signal. This signal remains high for the entire duration of the
output block. This signal is present only for punctured and block decoding.
Bit-error rate output. This port is available for continuous decoding only.
Identifies that a new Bit Error Rate (BER) value is available at the ber output
bervalid
1
O
port. This signal goes high once every B clock cycles, where B=2^( BER
Period ), is the duration over which BER is computed. This port is available for
continuous decoding only.
“Ready for input block” signal.
1. This port is not available for non-punctured decoders.
2. For fixed puncturing, this signal goes high every L*(2^c) cycles periodically
counting from ibstart for each input block, where L is the traceback length
and c is the hybrid index. After applying an input block (after ibend going
rfib
1
O
active), the user has to wait for the next rfib pulse before he can start giv-
ing the next input block. In fixed puncturing mode, this port is available only
for zero flushing block decoding and Number of Tracebacks is 2.
3. For dynamic puncturing, this port is always available. It goes low one cycle
after an input block starts (after ibstart signal going high). It goes high a
few cycles after an input block ends (after ibend going low).
IPUG32_02.7, June 2010
13
Block Viterbi Decoder User’s Guide
相关PDF资料
VTERB-DECO-XP-N1 IP CORE VITERBI DECODER XPGA
VTP110F POLYSWITCH PTC RESET 1.1A STRAP
VTP175LF POLYSWITCH PTC RESET 1.75A STRAP
VTP210GF POLYSWITCH PTC RESET 2.1A STRAP
VTP210SF POLYSWITCH PTC RESET 2.1A STRAP
W51-A121B1-10 CIRCUIT BREAKER THERM 10A ILLUM
W54-XC2A4B10-40 CIRCUIT BREAKER THERMAL 40AMP
WV-089047-10-9 LABEL ID PRODUCTS
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