Motorola DSP56301 user manual Summary of HI32 Signals and Modes

Host Interface (HI32)

Table 2-10.Host Interface (Continued)

Signal Name	Type	State During	Signal Description
		Reset
HAD[31–16]	Input/Output	Tri-stated	Host Address/Data 16–31—When the HI32 is programmed to
			interface with a PCI bus and the HI function is selected, these
			signals are lines 16–31 of the bidirectional, multiplexed
			Address/Data bus.
HD[23–8]	Input/Output		Host Data 8–23—When the HI32 is programmed to interface with a
			universal non-PCI bus and the HI function is selected, these signals
			are lines 8–23 of the bidirectional Data bus.
			Port B —When the HI32 is configured as GPIO through the DCTR,
			these signals are internally disconnected.
	Input	Tri-stated	Hardware Reset—When the HI32 is programmed to interface with
HRST
			a PCI bus and the HI function is selected, this is the Hardware Reset
			input.
HRST	Input		Hardware Reset—When the HI32 is programmed to interface with
			a universal non-PCI bus and the HI function is selected, this signal
			is the Hardware Reset Schmitt-trigger input.
			Port B —When the HI32 is configured as GPIO through the DCTR,
			this signal is internally disconnected.
	Output, open	Tri-stated	Host Interrupt A—When the HI function is selected, this signal is
HINTA
	drain		the Interrupt A open-drain output.
			Port B —When the HI32 is configured as GPIO through the DCTR,
			this signal is internally disconnected.
PVCL	Input	Input	PCI Voltage Clamp— When the HI32 is programmed to interface
			with a PCI bus and the HI function is selected and the PCI bus uses
			a 3 V signal environment, connect this pin to VCC (3.3 V) to enable
			the high voltage clamping required by the PCI specifications. In all
			other cases, including a 5 V PCI signal environment, leave the input
			unconnected.

Table 2-11.Summary of HI32 Signals and Modes

Signal	PCI Mode	Enhanced Universal Bus Mode	Universal Bus Mode	GPIO Mode
Name
HP0	HAD0	HA3		HIO0
HP1	HAD1	HA4		HIO1
HP2	HAD2	HA5		HIO2
HP3	HAD3	HA6		HIO3
HP4	HAD4	HA7		HIO4
HP5	HAD5	HA8		HIO5
HP6	HAD6	HA9		HIO6
HP7	HAD7	HA10		HIO7

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