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Design and implementation of the operation and maintenance software for a new GSM transcoder - page 19 / 26

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© NOKIA19 paavo.markkola@nokia.com18.10.2005

Implementation, DSP Management

DSP supervision proceeds as in TCSM2 but the interface to the DSP block is different

Only one 16-bit message register per DSP core

Three channels must use the same register

Problematic as DSP cores have interrupts disabled in 125 µs periods

To minimize worst case delay the protocol must make consecutive writes to different registers

Channel failures cause restart of the corresponding DSP core

If the channel is in the first core then the whole DSP must be restarted

DSP load procedure is also different

Software is first copied from flash to DSP code loading memory

Hardware logic loads the DSPs

Once complete the host processors is interrupted

All PCM lines connected  the transcoder may use different codec

In TCSM3i one software can implement all codecs and features

TCSM2 has several softwares due to the limitations of the DSPs

In TCSM3i the same software must be loaded to all DSPs as no combination DSPs matches one PCM

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