SM5906AF datasheet(23/30 Pages) NPC

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NIPPON PRECISION CIRCUITS-23

SM5906AF

Compare-connect sequence

In compare-connect mode, there are 6 connect

modes: CDDA mode 3-pair compare-connect, 2-

pair compare-connect and direct connect, plus

VCD/SVC mode ASH connect (SYNC, HEADER),

SH data connect (no C2PO check), and S connect

(SYNC) modes.

– CD-DA mode

In 3-pair compare-connect mode, the final 6 valid

data (3 pairs of left- and right-channel) and the

most recently input data are compared until three

continuous data pairs all conform. At this point, the

write sequence is re-started and data is written to

VWA.

In 2-pair compare-connect mode, comparison

occurs just as for 3-pair comparison except that

only 2 pairs from the three compared need to con-

form with the valid data. At this point, the write

sequence is re-started and data is written to VWA.

In direct-connect mode, comparison is not per-

formed at all, and write sequence starts and data is

written to the VWA. This mode is for systems that

cannot perform compare-connect operation.

– Compare-connect preparation time

1. Comparison data preparation time

Internally, when the compare-connect start com-

mand is issued, a sequence starts to restore the

data for comparison. The time required for this

preparation after receiving the command is

approximately 1

× (1/fs). (approximately 23 µs

when fs = 44.1 kHz)

2. After the above preparation is finished, data is

input beginning from the left-channel data and

comparison starts.

3. The same sequence takes place in direct-con-

nect mode also. However, at the point when 3

words have been input, all data is directly con-

nected as if comparison and conformance had

taken place.

If a compare-connect stop command (80H with

MSDCN1= 1, MSDCN2= 0) is input from the micro-

controller, compare-connect sequence stops.

If compare-connect sequence was not operating,

the compare-connect stop command performs no

operation. However, make sure that the other bit

settings within the same 80H command are valid.

– VCD, SVC mode

In ASH connect mode, the final 12 bytes of sync

data in the valid data, 4 bytes of header data and

the corresponding C2PO value are compared with

new input data. If the data matches, the write

sequence starts from the next data and connect

occurs after the header data.

In SH connect mode, the compare occurs in the

same manner as in ASH connect mode except the

C2PO is not checked, even if it contains an error. If

the data matches, the write sequence starts from

the next data and connect occurs after the header

data.

In S connect mode, the new data is compared with

the sync data. If the data matches, the write

sequence starts from the next data and connect

occurs after the sync data. S connect mode can be

used when other connections are not successful.

– Compare-connect sequence stop

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