External Frame Sync Sampling - Analog Devices SHARC ADSP-214 Series Hardware Reference Manual

Table of Contents

Note that for I

select only the clock and frame sync to be simultaneously configured as

master or slave.

External Frame Sync Sampling

A variety of framing options are available on the SPORTs as shown in

When the SPORT is enabled, an already active externally applied

frame sync is not allowed to start operation. An additional feature

allows programs to configure the SPORTs to wait for a valid state

change from inactive to active for the external frame sync to con-

sider it valid. This is true for the first valid frame after the SPORT

is enabled and applicable to both level and edge sensitive frame

syncs. This feature is enabled by setting the frame sync edge detec-

Table 10-5. Framing Options

Standard serial

Left-justified pair

Multichannel

Signals: Level Versus Edge Sampling

The SPORT slaves allow programs to sample the frame sync and data on

its signal level or edges depending on the operation mode. Note that in a

noise free environment it doesn't matter which sampling type is selected.

In noisy environments however, the edge based sampling is prefered as it

allows better re-synchronization of the communication link.

ADSP-214xx SHARC Processor Hardware Reference

www.BDTIC.com/ADI

S and left-justified mode, the

, bit 2 in the

External Frame Sync Sampling

Level sensitive

Edge detection

Level/edge sensitive

Serial Ports

bit allows programs to

Table of Contents