Motorola DSP56012 User Manual

• Speed—6.6 million words/sec (19.8 MBytes/sec) Interrupt Driven Data 

Transfer Rate (this is the maximum interrupt rate for the DSP56012 running at 
81 MHz)

– H[7:0]—HI data bus

– HOA[2:0]—HI Address select

– HEN—HI Enable

– HR/W—HI Read/Write select

– HOREQ—HI Request

– HACK —HI Acknowledge

• Interface—DSP CPU side:

– Mapping: three X-memory locations

– Data Word: 24 bits

– Transfer Modes:

• DSP-to-Host

• Host-to-DSP

• Host Command

– Software polled

– Interrupt-driven (fast or long interrupts)

– Direct Memory Access (DMA)

– Memory-mapped registers allow the standard MOVE instruction to be 

used.

– Special MOVEP instruction provides for I/O service capability using fast inter

rupts.

– Bit addressing instructions (BCHG, BCLR, BSET, BTST, JCLR, JSCLR, JSET, 

JSSET) simplify I/O service routines.