Hi32 Features; Interface - Dsp56300 Core Side - Motorola DSP56305 User Manual

HOST INTERFACE (HI32)

HI32 Features

6.2 HI32 FEATURES
The DSP56305 host interface features are discussed below as they apply to the Core
Interface, the Host Interface, the PCI mode, and the UB mode.
6.2.1

Interface - DSP56300 Core Side

• Mapping — 11 internal I/O data space memory locations
• Word Sizes
— 24-bit (DSP56305 native) data words
— 16-bit
— 8-bit
• Data Format Conversions
– PCI Mode
• Output data alignment of 16-bit words to 32-bit words
• Output data alignment of 24-bit words to 32-bit words
– left aligned and zero filled
– right aligned and zero extended
– right aligned and sign extended
• Input data alignment of 32-bit words to 24-bit words
– three most significant bytes
– three least significant bytes
• True 32-bit word input and output data transfers
– 32-bit PCI bus data to two DSP56300 core 16-bit words, and vice versa
– UB Mode
• Output data alignment of 24-bit words to 16-bit words
– two most significant bytes
– two least significant bytes
6-4 DSP56305 User's Manual MOTOROLA