參數(shù)資料
型號: DSP1628
英文描述: TVS 400W 60V BIDIRECT SMA
中文描述: 澄清,串行I /設(shè)備的DSP1620/27/28/29 O控制注冊說明
文件頁數(shù): 32/114頁
文件大小: 804K
代理商: DSP1628
Preliminary Data Sheet
February 1997
DSP1628 Digital Signal Processor
30
Lucent Technologies Inc.
4 Hardware Architecture
(continued)
Operation of the ECCP
To operate the ECCP, the user first programs its mode of operation by setting the control register, ECON, the tra-
ceback length register, TBLR, and appropriately initializing the present state accumulated costs. The complete Vit-
erbi decoding operation is achieved by recursively loading the received symbols into the ECCP, executing the ECCP
with an UpdateMLSE, an UpdateConv, or a TraceBack instruction, and unloading the decoded symbol from the
ECCP. The operation of the ECCP is captured in the signal flow diagram in Figure 8.
Figure 9. ECCP Operation Sequence
DSP PROGRAMS ECCP
DSP LOADS CHANNEL/GENERATING
POLYNOMIALS INTO THE ECCP
DSP LOADS RECEIVED
SYMBOLS INTO THE ECCP
DSP EXECUTES
UPDATE INSTRUCTION
NEW
ADAPTED
CHANNEL
TL = TBLR
FETCH MINIMUM COST INDEX
CALCULATE
REVERSED PATH
TL = TL – 1
IS
TL = 0
IS
TRACEBACK
INSTR.
DECREMENT
TBLR BY ONE
OUTPUT
DECODED SYMBOL
VITERBI
DECODING
COMPLETE
ALL
SYMBOLS
DECODED
NO
YES
YES
NO
NO
NO
YES
SET K = 0
CALCULATE BRANCH METRIC
FOR BOTH STATE TRANSITIONS TO K
CALCULATE ACCUMULATED COST
FOR STATE TRANSITIONS TO K
SELECT MINIMUM ACCUMULATED
COST AS SURVIVOR PATH
UPDATE MINIMUM COST INDEX
STORE SURVIVOR PATH
INCREMENT
K BY ONE
IS
K < 2
(C – 1)
– 1
YES
NO
YES
5-4502(F)
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