DSP56857 datasheet(431/662 Pages) FREESCALE

431 / 662 page

HI8 Host Port

Host Interface Eight (HI8), Rev. 4

Freescale Semiconductor

16-5

16.3 Signal Descriptions

16.4 HI8 Host Port

This section’s table details the HI8 pins and their functions. Additionally, the HI8 block diagram

is located as Figure 16-1following the HI8 pins details in Table 16-1.

Table 16-1.

Host Interface 8 Signals

HI8 Port Pin

Signal Name

Signal Type

State During

Reset of Stop

Signal Description

HD[0:7]

HD0 - HD7

(PB0 - PB7)

Input /Output

Input or Output

Disconnected

Internally

Host Data Bus—This bidirectional data bus is used

to transfer data between the Host Processor and the

DSC, (HD0-HD7).

Port B 0-7—These are GPIO pins when not

configured for Host port use.

HA[0:2]

HA0 - HA2

(PB8 - PB10)

Input

Input/Output

Disconnected

Internally

Host Address—These inputs provide the address

selection for the HI8 registers, (HA0-HA2).

Port B 8-10—These are GPIO pins when not

configured for Host port use.

HRW / HRD

HRW

HRD

(PB11)

Input

Output

Disconnected

Internally

Host Read/Write—When the HI8 is programmed to

interface to a single data strobe host bus, this signal

is the Read/Write input (HRW). When set low, the

Host writes data to DSC. When set high, the Host

reads data from DSC.

Host Read Data Strobe—When the HI8 is

programmed to interface to a double data strobe

host bus, this signal is the Read Data strobe input

(HRD), active low.

Port B 11—This is a GPIO pin when not configured

for Host port use.

HDS / HWR

HDS

HWR

(PB12)

Input

Input/Output

Disconnected

Internally

Host Data Strobe—When the HI8 is programmed to

interface to a single-data strobe host bus, this input

enables a data transfer on the HI8 when HCS is set

to low.

Host Write Data Strobe—When the HI8 is

programmed to interface to a double data strobe

host bus and the HI8 function is selected, this active

low signal is the Write Data Strobe input (HWR).

Port B 12—This is a GPIO pin when not configured

for Host port use.

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