DSP56303 datasheet(35/292 Pages) FREESCALE

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Host Interface (HI08)

DSP56303 User’s Manual, Rev. 2

Freescale Semiconductor

2-11

HA2

HA9

PB10

Input

Input or

Output

Ignored input

Host Address Input 2

When the HI08 is programmed to interface with a non-multiplexed host

bus and the HI function is selected, this signal is line 2 of the Host

Address bus.

Host Address 9

When the HI08 is programmed to interface with a multiplexed host bus

and the HI function is selected, this signal is line 9 of the Host Address

bus.

Port B 10

When the HI08 is configured as GPIO through the HPCR, this signal is

individually programmed through the HDDR. This input is 5 V tolerant.

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

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 Host Read Data

strobe (HRD) 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 HPCR, this signal is

individually programmed through the HDDR. This input is 5 V tolerant.

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 HPCR, this signal is

individually programmed through the HDDR. This input is 5 V tolerant.

Table 2-11. Host Interface (Continued)

Signal Name

Type

State During

Reset1,2

Signal Description

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