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Host Interface (HDI08)
HDI08 Features
– Host Command
•
Handshaking Protocols:
– Software polled
– Interrupt driven
– Core DMA accesses
•
Instructions:
– Memory-mapped registers allow the standard MOVE instruction to be used to
transfer data between the DSP and the external host.
– Special MOVEP instruction provides for I/O service capability using fast
interrupts.
– Bit addressing instructions (e.g. BCHG, BCLR, BSET, BTST, JCLR, JSCLR,
JSET, JSSET) simplify I/O service routines.
8.2.2
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)
8-2
DSP56367
MOTOROLA
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