Motorola DSP56301 user manual Host Port Pins HI32, Pci, Gpio

Host Interface (HI32)

Table 2-11.Summary of HI32 Signals and Modes (Continued)

Signal	PCI Mode	Enhanced Universal Bus Mode	Universal Bus Mode	GPIO Mode
Name
HP40	HAD23	(pull up or down if not used)1	HD15	disconnected
HP41	HAD24	(pull up or down if not used)1	HD16	disconnected
HP42	HAD25	(pull up or down if not used)1	HD17	disconnected
HP43	HAD26	(pull up or down if not used)1	HD18	disconnected
HP44	HAD27	(pull up or down if not used)1	HD19	disconnected
HP45	HAD28	(pull up or down if not used)1	HD20	disconnected
HP46	HAD29	(pull up or down if not used)1	HD21	disconnected
HP47	HAD30	(pull up or down if not used)1	HD22	disconnected
HP48	HAD31	(pull up or down if not used)1	HD23	disconnected
HP49	HRST	HRST (Schmitt trigger buffer on input)
HP50
	HINTA
PVCL	Leave unconnected

1.HD23-HD16 Output is high impedance if HRF≠$0. Input is disconnected if HTF≠$0.

Table 2-12.Host Port Pins (HI32)

Signal	PCI	Universal Bus Mode
Name		Enhanced Universal Bus Mode	GPIO
HP[7–0]	HAD[15–0]	HA[10–3]	HIO[15–8]
	Address/Data Multiplexed Bus	Host Address Bus	GPIO2
	Tri-state bidirectional bus.	Input pin.
	During the first clock cycle of a	Selects HI32 register to access. HA[10–3]
	transaction HAD31-HAD0 contain the	select the HI32 and HA[2–0] select the
	physical byte address (32 bits).	particular register of the HI32 to be accessed.
	During subsequent clock cycles,
HP[15–8]		HD[7–0]
	HAD31-HAD0 contain data.
		Host Data Bus
		Tri-state, bidirectional bus.
		Transfers data between the host processor
		and the HI32.
		This bus is released (disconnected) when the
		HI32 is not selected by HA[10-0]. The
		HD[23–0] pins are driven by the HI32 during a
		read access and are inputs to the HI32 during
		a write access.
		HD[23–16] outputs are high impedance if
		HRF≠$0. HD[23–16] inputs are disconnected
		if HTF≠$0.

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