GC5316 datasheet(40/75 Pages) TI

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GC5316

SLWS154A − JANUARY 2004 − REVISED MARCH 2004

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3.1.9 Transmit Sum Chain

Or 1 U MTS Cha nne l

CDM A

DUC B

CDM A

DUC A

DUC 0

Or 1 U MTS Cha nne l

CDM A

DUC B

CDM A

DUC A

Or 1 U MTS Cha nnel

CDM A

DUC B

CDM A

DUC A

DUC 11

D UC 1

D UCs

2−10

To Scale and

Round block

SUM 0

SUM 1

SUM 2

SUM 3

Figure 34. Transmit Sum Chain

The transmit sum chain is a daisy-chain of all DUC outputs into four independent composite output streams. Each

DUC output drives four complex adders, each summing the DUC’s contribution into the sum chain.

The DUC output data driving the adders is 21 bits. The sum chain partial sum outputs are 26 bits to allow for word

growth. Each DUC output can contribute to any of the four sum chains, or not, via programmable enable lines. The

output of the last daisy-chained sum is then the composite of all of the 24 CDMA or 12 UMTS channels. One should

always ensure that within a sum chain, there are no DUCs powered down with lower numbers than those that are

active with higher numbers, thus breaking the chain. In other words, if DUCs 3−5 are used and active, DUCs 0−2

must not be powered down.

As shown in the diagram above, each DUC contains a portion of the sumchain. Within the programming for each DUC

one can enable adding results from that DUC signal path(s) to each of the four sum-chains using the parameters

below.

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