DSP56307SLASHD datasheet(22/156 Pages) MOTOROLA

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1-16

DSP56307 Technical Data

MOTOROLA

Signals/Connections

HI08

HRW

HRD/HRD

PB11

Input

Input or

Output

Input

Host Read/Write

ÑWhen HI08 is programmed to

interface a single-data-strobe host bus and the HI

function is selected, this signal is the Host

Read/Write (HRW) input.

Host Read Data

ÑWhen HI08 is programmed to

interface 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

ÑWhen the HI08 is configured as GPIO

through the HPCR, this signal is individually

programmed as an input or output through the

HDDR.

Note:

This signal has a weak keeper to maintain the last state

even if all drivers are tri-stated.

HDS/HDS

HWR/HWR

PB12

Input

Input or

Output

Input

Host Data Strobe

ÑWhen HI08 is programmed to

interface 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

ÑWhen HI08 is programmed to

interface 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

ÑWhen the HI08 is configured as GPIO

through the HPCR, this signal is individually

programmed as an input or output through the

HDDR.

Note:

This signal has a weak keeper to maintain the last state

even if all drivers are tri-stated.

Table 1-10

Host Interface (Continued)

Signal Name

Type

State

During

Reset

Signal Description

Not Recommended for New Design

DSP56307/D Datasheet(PDF) 22 Page - Motorola, Inc

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