GS1582-IBE3 View Datasheet(PDF) - Semtech Corporation

Part Name

Description

Manufacturer

GS1582-IBE3

Multi-Rate Serializer with Cable Driver, Audio Multiplexer and ClockCleaner™

Semtech Corporation 

Table 4-12: GS1582 Serial Audio Data Inputs

Parameter

Symbol

Input Data Set-up

tSU

Time

Input Data Hold Time

tIH

Conditions

50% levels;

3.3V or 1.8V

operation

Min Typ Max Units

74

–

–

ns

74

–

–

ns

ACLK

A_IN_[8/7:2/1]

DATA

DATA

Control signal

input

tSU

tIH

Figure 4-18: ACLK to Data & Control Signal Input Timing

4.7.16 5-frame Sequence Detection

5-frame sequence detection is required for 525-line based standard definition formats

and to embed the Audio Frame Number word in the audio control packets for

synchronous audio in both HD and SD formats.

4.7.16.1 SD Audio Multiplexing

The GS1582 detects the frame sequence that describes the sample distribution for

synchronous audio. This information is used in the generation of the Audio Frame

Number (AFN) field, describing the position of the current frame within the sequence.

AFN values will only be generated for group A if the AFNA_AUTO bit in the host

interface, and for group B if the AFNB_AUTO bit is set.

If the GS1582 is not configured to generate AFN values, the AFN field will be set to 0 at

all times. However, if the core is configured to generate AFN values, the AFN value will

be between 1 and 5, depending on where the given frame lies in the frame sequence.

With a frame rate of 25 Hz, each frame will contain 1920 samples, and each frame will

have an AFN of one (see Table 4-13). For a frame rate of 29.97 Hz, 8008 samples are

distributed over 5 frames, as shown in Table 4-14.

The GS1582 will add the offset specified in the AFN_OFS[2:0] host interface field to the

generated AFN. The result will wrap around, leaving the resulting AFN in the range of 1

through 5.

GS1582 Multi-Rate Serializer with Cable Driver, Audio

Multiplexer and ClockCleanerTM

Data Sheet

40117 - 4

December 2011

52 of 115

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