DSP1620 View Datasheet(PDF) - Agere -> LSI Corporation

Part Name

Description

Manufacturer

DSP1620

DSP1627 Digital Signal Processor

Agere -> LSI Corporation 

Preliminary Data Sheet

February 1997

DSP1628 Digital Signal Processor

4 Hardware Architecture (continued)

DSP Decoding Operation Sequence

The DSP operation sequence for invoking the ECCP for an MLSE equalization or convolutional decoding operation

is explained with the operation flow diagram in Figure 7.

EBUSY = FALSE

ECCP OFF

(LOAD ECCP)

EBUSY = TRUE

ECCP ON

(EXEC ECCP)

PROGRAM

ECCP

PROGRAM ECCP

{ECON = VALUE, TBLR = TL

H, G = CHANNEL, GEN. POLY.}

LOAD SYMBOL 1

INTO ZI:ZQ/S[5:0]

UPDATE MLSE/CONV INSTR 1

EBUSY = FALSE

ECCP OFF

(UNLOAD ECCP)

INVALID DECODED SYMBOL 1

LOAD N SET

OF RECEIVED

SYMBOLS

AND

EXECUTE N

UPDATE

INSTRUCTIONS

LOAD SYMBOL TL

INTO ZI:ZQ/S[5:0]

LOAD SYMBOL TL + 1

INTO ZI:ZQ/S[5:0]

UPDATE MLSE/CONV INSTR TL

INVALID DECODED SYMBOL TL

UPDATE MLSE/CONV INSTR TL + 1

VALID DECODED SYMBOL 1

DISCARD TL

INVALID

DECODED

SYMBOLS

EXECUTE

TL TRACEBACK

INSTRUCTIONS

LOAD SYMBOL N

INTO ZI:ZQ/S[5:0]

UPDATE MLSE/CONV INSTR N VALID DECODED SYMBOL N + TL

TRACEBACK INSTR 1

VALID DECODED SYMBOL N + TL + 1

ACCEPT N

VALID

DECODED

SYMBOLS

TRACEBACK INSTR TL

VALID DECODED SYMBOL N

Figure 8. DSP Core Operation Sequence

5-4501(F).a

Lucent Technologies Inc.

29

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