DSP56303 datasheet(36/292 Pages) FREESCALE

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DSP56303 User’s Manual, Rev. 2

2-12

Freescale Semiconductor

Signals/Connections

HCS

HA10

PB13

Input

Input or

Output

Ignored input

Host Chip Select

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

bus and the HI function is selected, this signal is the Host Chip Select

(HCS) input. The polarity of the chip select is programmable, but is

configured active-low (HCS) after reset.

Host Address 10

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

and the HI function is selected, this signal is line 10 of the Host Address

bus.

Port B 13

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

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

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 can 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 HPCR, this signal is

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

HACK/HACK

HRRQ/HRRQ

PB15

Input

Output

Input or

Output

Ignored input

Host Acknowledge

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 Acknowledge

(HACK) Schmitt-trigger input. The polarity of the host acknowledge is

programmable, but is configured as active-low (HACK) after reset.

Receive 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 Receive Host

Request (HRRQ) output. The polarity of the host request is

programmable, but is configured as active-low (HRRQ) after reset. The

host request may be programmed as a driven or open-drain output.

Port B 15

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

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

Notes: 1.

In the Stop state, the signal maintains the last state as follows:

•

If the last state is input, the signal is an ignored input.

•

If the last state is output, these lines are tri-stated

The Wait processing state does not affect the signal state.

Table 2-11. Host Interface (Continued)

Signal Name

Type

State During

Reset1,2

Signal Description

DSP56303 Datasheet(PDF) 36 Page - Freescale Semiconductor, Inc

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