Motorola DSP56301 user manual Command 0-3/Byte Enable 0-3 -When the HI32 is programmed

Host Interface (HI32)

Table 2-10.Host Interface (Continued)

Signal Name	Type	State During	Signal Description
		Reset
HC0–HC3/	Input/Output	Tri-stated	Command 0–3/Byte Enable 0–3 —When the HI32 is programmed
HBE[3–0]			to interface with a PCI bus and the HI function is selected, these
			signals are lines7–0 of the bidirectional, multiplexed Address/Data
			bus.
HA[2–0]	Input		Host Address 0–2—When the HI32 is programmed to interface
			with a universal non-PCI bus and the HI function is selected, these
			signals are lines 2–0 of the input Address bus.
			The fourth signal in this set should be connected to a pull-up resistor
			or directly to VCC when a non-PCI bus is used.
PB[19–16]	Input or		Port B 16–19—When the HI32 is configured as GPIO through the
	Output		DCTR, these signals are individually programmed as inputs or
			outputs through the HI32 DIRH.
	Input/	Tri-stated	Host Target Ready—When the HI32 is programmed to interface
HTRDY
	Output		with a PCI bus and the HI function is selected, this is the Host
			Target Ready signal.
	Output		Host Data Bus Enable—When HI32 is programmed to interface
HDBEN
			with a universal non-PCI bus and the HI function is selected, this
			signal is Host Data Bus Enable output.
PB20	Input or		Port B 20—When the HI32 is configured as GPIO through the
	Output		DCTR, this signal is individually programmed as an input or output
			through the HI32 DIRH.
	Input/	Tri-stated	Host Initiator Ready—When the HI32 is programmed to interface
HIRDY
	Output		with a PCI bus and the HI function is selected, this is the Host
			Initiator Ready signal.
	Output		Host Data Bus Direction—When HI32 is programmed to interface
HDBDR
			with a universal non-PCI bus and the HI function is selected, this
			signal is Host Data Bus Direction output.
PB21	Input or		Port B 21—When the HI32 is configured as GPIO through the
	Output		DCTR, this signal is individually programmed as an input or output
			through the HI32 DIRH.
	Input/	Tri-stated	Host Device Select—When the HI32 is programmed to interface
HDEVSEL
	Output		with a PCI bus and the HI function is selected, this is the Host
			Device Select signal.
	Output		Host Select Acknowledge—When HI32 is programmed to
HSAK
			interface with a universal non-PCI bus and the HI function is
			selected, this signal is Host Select Acknowledge output.
PB22	Input or		Port B 22—When the HI32 is configured as GPIO through the
	Output		DCTR, this signal is individually programmed as an input or output
			through the HI32 DIRH.

Signals/Connections 2-11