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Parallel Host Interface (HDI08)

DSP56367 Technical Data, Rev. 2.1

2-8

Freescale Semiconductor

2.10

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

HAD0–HAD7

PB0–PB7

Input/

Output

Input/

Output

Input, Output, or

Disconnected

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.

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.

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 3.3V tolerant.

HA0

HAS/HAS

PB8

Input

Input, Output, or

Disconnected

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.

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.

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 3.3V tolerant.

HA1

HA8

PB9

Input

Input, Output, or

Disconnected

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.

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.

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 3.3V tolerant.

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