Case Study #2

C62xx C54x

# of channels 60 60

(EFR GSM algorithm)

# of channels / DSP 30 6

# of DSPs 2 10

DSP total cost $192 $330

$ / channel $3.20 $5.50

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For case study #2, the goal is to implement 60 channels of enhanced full-rate GSM. This would be two E1 spans. Looking at the C54x, EFR GSM requires approximately 16 MIPS to implement. This means that 60 channels would necessitate ten 100 MIPS C54x devices (each implementing six channels). The DSP price of this solution would be $330 (10 * $33) and the $ / channel would equal $5.50 ($330/60 channels). Taking the 5:1 performance ratio into consideration shows that the C6x can implement five times the number of channels per DSP. This translates to two C6201 devices to handle the channel requirements. The DSP cost ($96 per 6201) would be $192 and the per channel cost is $3.20. For this application, where #’s of channels (channel density) is the primary concern, the C6x clearly has the lower cost per channel for this system. Therefore, since this is the #1 careabout, the C6x is the best solution. The requirement for “moving up the learning curve” quickly can be handled by the excellent C Compiler of the C6x.