DSP56366 datasheet(13/110 Pages) FREESCALE

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DSP56366 Technical Data, Rev. 3.1

Freescale Semiconductor

2-9

2.7

Parallel Host Interface (HDI08)

The HDI08 provides a fast, 8-bit, parallel data port that may be connected directly to the host bus. The

HDI08 supports a variety of standard buses and can be directly connected to a number of industry standard

microcomputers, microprocessors, DSPs, and DMA hardware.

Table 2-9 Host Interface

Signal Name

Type

State during

Reset

Signal Description

H0–H7

Input/

output

GPIO

disconnected

Host Data—When HDI08 is programmed to interface a nonmultiplexed host

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

bidirectional, tri-state data bus.

HAD0–HAD7

Input/

output

GPIO

disconnected

Host Address/Data—When HDI08 is programmed to interface a

multiplexed host bus and the HI function is selected, these signals are lines

0–7 of the address/data bidirectional, multiplexed, tri-state bus.

PB0–PB7

Input, output, or

disconnected

GPIO

disconnected

Port B 0–7—When the HDI08 is configured as GPIO, these signals are

individually programmable as input, output, or internally disconnected.

The default state after reset for these signals is GPIO disconnected.

These inputs are 5 V tolerant.

HA0

Input

GPIO

disconnected

Host Address Input 0—When the HDI08 is programmed to interface a

nonmultiplexed host bus and the HI function is selected, this signal is line 0

of the host address input bus.

HAS/HAS

Input

GPIO

disconnected

Host Address Strobe—When HDI08 is programmed to interface 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.

PB8

Input, output, or

disconnected

GPIO

disconnected

Port B 8—When the HDI08 is configured as GPIO, this signal is individually

programmed as input, output, or internally disconnected.

The default state after reset for this signal is GPIO disconnected.

This input is 5 V tolerant.

HA1

Input

GPIO

disconnected

Host Address Input 1—When the HDI08 is programmed to interface a

nonmultiplexed host bus and the HI function is selected, this signal is line 1

of the host address (HA1) input bus.

HA8

Input

GPIO

disconnected

Host Address 8—When HDI08 is programmed to interface a multiplexed

host bus and the HI function is selected, this signal is line 8 of the host

address (HA8) input bus.

PB9

Input, output, or

disconnected

GPIO

disconnected

Port B 9—When the HDI08 is configured as GPIO, this signal is individually

programmed as input, output, or internally disconnected.

The default state after reset for this signal is GPIO disconnected.

This input is 5 V tolerant.

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