Motorola 24-Bit Digital Signal Processor, DSP56000 manual 24X24+56 →56-BIT MAC OnCE

ON-CHIP EMULATION (OnCE) PINS

								EXPANSION
								AREA
	PERIPHERAL			PROGRAM		X MEMORY	Y MEMORY
				RAM/ROM		RAM/ROM	RAM/ROM
		MODULES
PERIPHERAL PINS				EXPANSION		EXPANSION	EXPANSION
			ADDRESS		YAB			EXTERNAL	ADDRESS
					XAB
		GENERATION						ADDRESS
	24-Bit				PAB
			UNIT					BUS
	56K Mod-							SWITCH
										A
								BUS	CONTROL	PORT
								CONTROL
					YDB
	INTERNAL				XDB			EXTERNAL	DATA
	DATA							DATA BUS
	BUS				PDB			SWITCH
	SWITCH
					GDB
	PLL					DATA ALU
		PROGRAM	PROGRAM	PROGRAM
						24X24+56→56-BIT MAC		OnCE
	CLOCK	INTERRUPT	DECODE	ADDRESS
		CONTROLLER	CONTROLLER	GENERATOR	TWO 56-BIT ACCUMULATORS
	GENERATOR
			Program Control Unit
			MODC/NMI

16 BITS

MODB/IRQB	24 BITS
MODA/IRQA

RESET

Figure 10-2 DSP56K Block Diagram

DSI/OS0 pin is an output when the processor is not in debug mode. When switching from output to input, the pin is three-stated. During hardware reset, this pin is defined as an out- put and it is driven low.

Note: To avoid possible glitches, an external pull-down resistor should be attached to this pin.

MOTOROLA ON-CHIP EMULATION (OnCE) 10 - 5