DSP56303 datasheet(34/292 Pages) FREESCALE

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DSP56303 User’s Manual, Rev. 2

2-10

Freescale Semiconductor

Signals/Connections

Table 2-11. Host Interface

Signal Name

Type

State During

Reset1,2

Signal Description

H[0–7]

HAD[0–7]

PB[0–7]

Input/Output

Input or

Output

Ignored input

Host Data

When the HI08 is programmed to interface with a non-multiplexed host

bus and the HI function is selected, these signals are lines 0–7 of the Data

bus.

Host Address

When the HI08 is programmed to interface with a multiplexed host bus

and the HI function is selected, these signals are lines 0–7 of the

Address/Data bus.

Port B 0–7

When the HI08 is configured as GPIO through the HPCR, these signals

are individually programmed through the HI08 Data Direction Register

(HDDR). This input is 5 V tolerant.

HA0

HAS/HAS

PB8

Input

Input or

Output

Ignored input

Host Address Input 0

When the HI08 is programmed to interface with a non-multiplexed host

bus and the HI function is selected, this signal is line 0 of the Host

Address bus.

Host Address Strobe

When the HI08 is programmed to interface with a multiplexed host bus

and the HI function is selected, this signal is the Host Address Strobe

(HAS) Schmitt-trigger input. The polarity of the address strobe is

programmable, but is configured active-low (

HAS) following reset.

Port B 8

When the HI08 is configured as GPIO through the HPCR, this signal is

individually programmed through the HDDR. This input is 5 V tolerant.

HA1

HA8

PB9

Input

Input or

Output

Ignored input

Host Address Input 1

When the HI08 is programmed to interface with a non-multiplexed host

bus and the HI function is selected, this signal is line 1 of the Host

Address bus.

Host Address 8

When the HI08 is programmed to interface with a multiplexed host bus

and the HI function is selected, this signal is line 8 of the Host Address

bus.

Port B 9

When the HI08 is configured as GPIO through the HPCR, this signal is

individually programmed through the HDDR. This input is 5 V tolerant.

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