DSP56321 datasheet(16/88 Pages) NXP

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1-10

Host Interface (HI08)

HRW

HRD/HRD

PB11

Input

Input or Output

Ignored Input

Host Read/Write—When the HI08 is programmed to interface

with a single-data-strobe host bus and the HI function is selected,

this signal is the Host Read/Write (HRW) input.

Host Read Data—When the HI08 is programmed to interface with

a double-data-strobe host bus and the HI function is selected, this

signal is the HRD strobe Schmitt-trigger input. The polarity of the

data strobe is programmable but is configured as active-low (HRD)

after reset.

Port B 11—When the HI08 is configured as GPIO through the

HI08 Port Control Register, this signal is individually programmed

as an input or output through the HI08 Data Direction Register.

HDS/HDS

HWR/HWR

PB12

Input

Input or Output

Ignored Input

Host Data Strobe—When the HI08 is programmed to interface

with a single-data-strobe host bus and the HI function is selected,

this signal is the host data strobe (HDS) Schmitt-trigger input. The

polarity of the data strobe is programmable but is configured as

active-low (HDS) following reset.

Host Write Data—When the HI08 is programmed to interface with

a double-data-strobe host bus and the HI function is selected, this

signal is the host write data strobe (HWR) Schmitt-trigger input.

The polarity of the data strobe is programmable but is configured

as active-low (HWR) following reset.

Port B 12—When the HI08 is configured as GPIO through the

HI08 Port Control Register, this signal is individually programmed

as an input or output through the HI08 Data Direction Register.

HREQ/HREQ

HTRQ/HTRQ

PB14

Output

Input or Output

Ignored Input

Host Request—When the HI08 is programmed to interface with a

single host request host bus and the HI function is selected, this

signal is the host request (HREQ) output. The polarity of the host

request is programmable but is configured as active-low (HREQ)

following reset. The host request may be programmed as a driven

or open-drain output.

Transmit Host Request—When the HI08 is programmed to

interface with a double host request host bus and the HI function is

selected, this signal is the transmit host request (HTRQ) output.

The polarity of the host request is programmable but is configured

as active-low (HTRQ) following reset. The host request may be

programmed as a driven or open-drain output.

Port B 14—When the HI08 is configured as GPIO through the

HI08 Port Control Register, this signal is individually programmed

as an input or output through the HI08 Data Direction Register.

Table 1-10. Host Interface (Continued)

Signal Name

Type

State During

Reset1,2

Signal Description

Freescale Semiconductor, Inc.

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