Freescale-semiconductor DSP56366 User Manual Page 96

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HDI08 Features
DSP56366 24-Bit Digital Signal Processor User Manual, Rev. 4
6-2 Freescale Semiconductor
Bit addressing instructions (e.g. BCHG, BCLR, BSET, BTST, JCLR, JSCLR, JSET, JSSET)
simplify I/O service routines.
6.2.2 Interface - Host Side
Sixteen signals are provided to support non-multiplexed or multiplexed buses:
H0-H7/HAD0-HAD7
Host data bus (H7-H0) or host multiplexed address/data bus (HAD0-HAD7)
HAS/HA0
Address strobe (HAS) or Host address line HA0
HA8/HA1
Host address line HA8 or Host address line HA1
HA9/HA2
Host address line HA9 or Host address line HA2
—HRW/HRD
Read/write select (HRW) or Read Strobe (HRD)
HDS/HWR
Data Strobe (HDS) or Write Strobe (HWR)
—HCS/HA10
Host chip select (HCS) or Host address line HA10
HOREQ/HTRQ
Host request (HOREQ) or Host transmit request (HTRQ)
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).
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