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– HACK/HRRQ
Host acknowledge (HACK) or Host receive request (HRRQ)
•
Mapping:
– HDI08 registers are mapped into eight consecutive byte locations in the external
host bus address space.
– The HDI08 acts as a memory or IO-mapped peripheral for microprocessors,
microcontrollers, etc.
•
Data Word:
– 8-bit
•
Transfer Modes:
– Mixed 8-bit, 16-bit and 24-bit data transfers
•
DSP to Host
•
Host to DSP
– Host Command
•
Handshaking Protocols:
– Software polled
– Interrupt-driven (Interrupts are compatible with most processors, including the
MC68000, 8051, HC11 and Hitachi H8).
– Cycle-stealing DMA with initialization
•
Dedicated Interrupts:
– Separate interrupt lines for each interrupt source
– Special host commands force DSP core interrupts under host processor control,
which are useful for the following:
•
Real-Time Production Diagnostics
•
Debugging Window for Program Development
•
Host Control Protocols
•
Interface Capabilities:
– Glueless interface (no external logic required) to the following:
•
Motorola HC11
•
Hitachi H8
•
8051 family
MOTOROLA
DSP56367
Host Interface (HDI08)
HDI08 Features
8-3
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