DSP56321 datasheet(14/84 Pages) FREESCALE

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DSP56321 Technical Data, Rev. 11

1-8

Freescale Semiconductor

Signals/Connections

HA0

HAS/HAS

PB8

Input

Input or Output

Ignored Input

Host Address Input 0—When the HI08 is programmed to interface with a

nonmultiplexed host bus and the HI function is selected, this signal is line 0 of

the host address input bus.

Host Address Strobe—When the HI08 is programmed to interface with a

multiplexed host bus and the HI function is selected, this signal is the host

address strobe (HAS) Schmitt-trigger input. The polarity of the address strobe is

programmable but is configured active-low (HAS) following reset.

Port B 8—When the HI08 is configured as GPIO through the HI08 Port Control

HI08 Data Direction Register.

HA1

HA8

PB9

Input

Input or Output

Ignored Input

Host Address Input 1—When the HI08 is programmed to interface with a

nonmultiplexed host bus and the HI function is selected, this signal is line 1 of

the host address (HA1) input bus.

Host Address 8—When the HI08 is programmed to interface with a multiplexed

host bus and the HI function is selected, this signal is line 8 of the host address

(HA8) input bus.

Port B 9—When the HI08 is configured as GPIO through the HI08 Port Control

HI08 Data Direction Register.

HA2

HA9

PB10

Input

Input or Output

Ignored Input

Host Address Input 2—When the HI08 is programmed to interface with a

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

the host address (HA2) input 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

(HA9) input bus.

Port B 10—When the HI08 is configured as GPIO through the HI08 Port Control

HI08 Data Direction Register.

HCS/HCS

HA10

PB13

Input

Input or Output

Ignored Input

Host Chip Select—When the HI08 is programmed to interface with a

nonmultiplexed 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 (HA10) input bus.

Port B 13—When the HI08 is configured as GPIO through the HI08 Port Control

HI08 Data Direction Register.

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 (HRW) 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 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—When the HI08 is configured as GPIO through the HI08 Port Control

HI08 Data Direction Register.

Table 1-10.

Host Interface (Continued)

Signal Name

Type

State During

Reset1,2

Signal Description

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