DSP56362/D View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

DSP56362/D

Digital audio applications requiring digital audio compression and decompression, sound field processing, acoustic equalization, and other digital audio algorithms.

Motorola => Freescale 

Signal

Name

BB

Freescale Semiconductor, Inc.

Signal/Connection Descriptions

External Memory Expansion Port (Port A)

Table 1-7 External Bus Control Signals (Continued)

Type

State during

Reset

Signal Description

Input/

Output

Input

Bus Busy—BB is a bidirectional active-low input/output.

BB indicates that the bus is active. Only after BB is

deasserted can the pending bus master become the bus

master (and then assert the signal again). The bus

master may keep BB asserted after ceasing bus activity

regardless of whether BR is asserted or deasserted. This

is called “bus parking” and allows the current bus master

to reuse the bus without rearbitration until another device

requires the bus. The deassertion of BB is done by an

“active pull-up” method (i.e., BB is driven high and then

released and held high by an external pull-up resistor).

The default mode of operation of this signal requires a

setup and hold time referred to CLKOUT. But CLKOUT

operation is not guaranteed from 100MHz and up, so the

asynchronous bus arbitration must be used for clock

frequencies 100MHz and above. The asynchronous bus

arbitration is enabled by setting the ABE bit in the OMR

register.

BB requires an external pull-up resistor.

MOTOROLA

DSP56362 Advance Information

1-9

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