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GC5318IZED Datasheet(PDF) 6 Page - Texas Instruments |
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GC5318IZED Datasheet(HTML) 6 Page - Texas Instruments |
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6 / 45 page  www.ti.com 2.1.1 Transmit Serial Input Interface 4 2 I Q I MSB I MSB-1 Q MSB Q MSB-1 PinsFromAdjacentDUC 1UMTS 1UMTS 2CDMA txin_X_a txin_X_b CHA InterleavedI,Q CHB InterleavedI,Q DUCBlock CDMADUCChannelA CDMADUCChannelB Frame Delay Clkdiv Sync FrameStrobe SharedbetweentwoDUCblocks,thatis:2kand2k+1,k=0to5. GC5318 HIGH-DENSITY DIGITAL UPCONVERTER SLWS187 – JULY 2006 This section describes the functions available in each of the 12 DUC blocks. Each block has its own register set and may be programmed individually. The final output rates of all DUC blocks must match since they are added together. Figure 2-2 illustrates the different signal processing blocks and general signal processing flow of an individual transmit channel. Within a block, a single set of hardware performs these functions for one UMTS signal or two CDMA signals. When processing two CDMA signals, the gain, round, power meter, PFIR and CFIR blocks are time-shared to process both signals with one set of hardware. Each DUC can support one UMTS channel or two CDMA channels. Each block accepts baseband serial data. At this point, the gain can be adjusted and a pilot sequence can be summed with the data. Baseband data gain adjusted and the pilot signal power can be measured. The programmable FIR filter (PFIR) is used to pulse shape the data and interpolates by a factor of two. The compensating CIC filter (CFIR) compensates for the roll-off of the following CIC filter and also interpolates by a factor of two. The CIC filter performs additional interpolation; this additional interpolation is programmable. The delay adjust block permits the channel's delay to be adjusted relative to all other DUC channels. The interpolated, filtered, and delayed data is then tuned to a user-programmed frequency with a digital mixer and oscillator. The DUC output data then drives four independent sum chain paths, where output data from each DUC can be summed into four composite streams. Each function block is described in greater detail in subsequent sections. Table 2-1. Programming VARIABLE DESCRIPTION cdma_mode When set, the DUC block is in CDMA2000 mode. Figure 2-3. Transmit Serial Input Interface 6 GC5318 Operation |
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