Motorola DSP56301 user manual Host Interface HI32

Host Interface (HI32)

2.7Host Interface (HI32)

The Host Interface (HI32) provides a fast parallel data port up to 32 bits wide that can connect directly to the host bus. The HI32 supports a variety of standard buses and provides glueless connection with the PCI bus standard and with a number of industry-standard microcomputers, microprocessors, DSPs and DMA hardware. The functions of the signals associated with the HI32 vary according to the programmed configuration of the interface as determined by the 24-bit DSP Control Register (DCTR). Refer to Chapter 6, Host Interface (HI32) for detailed descriptions of this and other HI32 configuration registers.

Note: All HI32 inputs are 5 V tolerant.

Table 2-10.Host Interface

Signal Name	Type	State During	Signal Description
		Reset
HAD[0–7]	Input/Output	Tri-stated	Host Address/Data 0–7—When the HI32 is programmed to
			interface with a PCI bus and the HI function is selected, these
			signals are lines 0–7 of the bidirectional, multiplexed Address/Data
			bus.
HA[3–10]	Input		Host Address 3–10—When HI32 is programmed to interface with a
			universal non-PCI bus and the HI function is selected, these signals
			are lines 3–10 of the input Address bus.
PB[0–7]	Input or		Port B 0–7—When the HI32 is configured as GPIO through the
	Output		DCTR, these signals are individually programmed as inputs or
			outputs through the HI32 Data Direction Register (DIRH).
HAD[15–8]	Input/Output	Tri-stated	Host Address/Data 8–15—When the HI32 is programmed to
			interface with a PCI bus and the HI function is selected, these
			signals are lines15–8 of the bidirectional, multiplexed Address/Data
			bus.
HD[7–0]	Input/Output		Host Data 0–7—When the HI32 is programmed to interface with a
			universal non-PCI bus and the HI function is selected, these signals
			are lines 7–0 of the bidirectional Data bus.
PB[15–8]	Input or		Port B 8–15—When the HI32 is configured as GPIO through the
	Output		DCTR, these signals are individually programmed as inputs or
			outputs through the HI32 DIRH.

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