First Inversion has detailed design experience in many areas.
Below is a sampling:

Device and IP Interfaces
   PIC ARM 8051 80X86/Pentium 68K/Coldfire/Freescale MPC85x/86x/603    C32/40/50/60
   AD21x/SHARC DSP16x/32x/Starcore Hitachi SH4 Various ADCs/DACs
   DDR2 DDR3 SRIO PCIe SDRAM/SSRAM OCP-IP

Bus Interfaces
   PCIe PCI/-X VME cPCI 1394 1149 LVDS MGT LVPECL
   MIX AGP2x/4x/8x SPI IRIG I2C

Technologies
   DSP DUC DDC CDMA GSM UMTS Correlation T1-T3 DS1/2/3
   SONET/SDH OC3-OC768 CDR Framers QAM QPSK MPEG JPEG
   LCD BT601/656 FFT/IFFT Digital Filtering & Resampling FSRC VRT 8B10B 4B5B

Also see: Tools and Languages of First Inversion