DSP56857 datasheet(80/662 Pages) FREESCALE

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Power, Ground and Peripheral Signals

5685X Digital Signal Controller User Manual, Rev. 4

2-12

Freescale Semiconductor

Table 2-6. Host Interface Eight

Signal Name

Signal Type

Signal Description

853

Pins

854

Pins

855

Pins

857

Pins

858

Pins

HD0-HD7

(GPIOB0-B7)

Input

Input / Output

Host Data—These inputs provide data for the HI

registers. These pins are disconnected internally

during reset.

Port B GPIO 0-7—These are a General Purpose

I/O pins when not configured for host port use.

—

HA0-HA2

(GPIOB8-B10)

Input

Input / Output

Host Address—These inputs provide address

selection for HI registers. These pins are

disconnected internally during reset.

Port B GPIO 10—These are General Purpose I/O

pins when not configured for host port use.

—

HRW

(HRD)

(GPIOB11)

Input

Input / Output

Host Read/Write—When the HI is programmed to

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

HI function is selected, this signal is the

Read/Write input. These pins are disconnected

internally during reset.

Host Read Enable—This signal is the Read Data

input when the HI is programmed to interface to a

double-data-strobe host bus and the HI function is

selected.

Port B GPIO 11—This is a General Purpose I/O

pin when not configured for host port use.

—

HDS

(HWR)

(GPIOB12)

Input

Input / Output

Host Data Strobe—When the HI is programmed

to interface to a single-data-strobe host bus and

the HI function is selected, this input enables a

data transfer on the HI when HCS is asserted.

Host Write Enable—This signal is the Write Data

input when the HI is programmed to interface to a

double-data-strobe host bus and the HI function is

selected.

Port B GPIO 12—This is a General Purpose I/O

pin when not configured for host port use.

—

HCS

(GPIOB13)

Input

Input / Output

Host Chip Select—This input is the chip select

input for the Host Interface.This pin is

disconnected internally when reset.

Port B GPIO 13—This is a General Purpose I/O

pin when not configured for host port use.

—

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