1 shi input/output shift register (iosr)—host side, Figure55 shi i/o shift register (iosr), 2 shi host transmit data register (htx)—dsp side – Motorola DSP56012 User Manual
Page 156: Shi host transmit data register (htx)—dsp side -8, Figure 5-5, Shi i/o shift register (iosr) -8