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Host Interface (HI08)
—
HRW / HRD
read/write select ( HRW ) or read strobe ( HRD )
Note:
—
—
—
—
HDS / HWR data strobe ( HDS ) or write strobe ( HWR )
HCS / HA10 host chip select ( HCS ) or host address line ( HA10 )
HREQ / HTRQ host request ( HREQ ) or host transmit request ( HTRQ )
HACK / HRRQ host acknowledge ( HACK ) or host receive request ( HRRQ )
The signals in the above list that are shown as asserted low (for example, HRD ) all have
programmable polarity. The default value following reset is shown in the above list.
Mapping:
— HI08 registers are mapped into eight consecutive locations in the host’s external bus
address space.
— The HI08 acts as a memory or I/O-mapped peripheral for microprocessors,
microcontrollers, and so forth.
Transfer modes:
— Mixed 8-bit, 16-bit, and 24-bit data transfers, DSP-to-host and 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.)
Data word: 8 bits
Dedicated interrupts:
— Separate request lines for each interrupt source
— Special host commands force DSP core interrupts under host processor control. These
commands are useful for
? Real-time production diagnostics
? Creation of a debugging window for program development
? Host control protocols
Interface capabilities:
— Glueless interface (no external logic required) to
? HC11
? Hitachi H8
? 8051 family
? Thomson P6 family
— Minimal glue logic (pull-ups, pull-downs) required to interface to
? ISA bus
? Freescale 68K family
? Intel X86 family
DSP56311 User’s Manual, Rev. 2
6-2
Freescale Semiconductor
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