STA309A datasheet(45/67 Pages) STMICROELECTRONICS

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STA309A

Registers

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7.2.41

Biquad internal channel loop-through (0x28)

Each internal processing channel can receive two possible inputs at the input to the biquad

block. The input can come either from the output of that channel’s MIX#1 engine or from the

output of the bass/treble (Biquad#10) of the previous channel. In this scenario, channel 1

receives channel 8. This enables the use of more than 10 biquads on any given channel at

the loss of the number of separate internal processing channels.

7.2.42

Mix internal channel loop-through (0x29)

Each internal processing channel can receive two possible sets of inputs at the inputs to the

Mix#1 block. The inputs can come from the outputs of the interpolation block as normally

occurs (CnMXLP = 0) or they can come from the outputs of the Mix#2 block. This enables

the use of additional filtering after the second mix block at the expense of losing this

processing capability on the channel.

C8BLP

C7BLP

C6BLP

C5BLP

C4BLP

C3BLP

C2BLP

C1BLP

000

Table 67.

CnBLP bits

Bit

RST

Name

Description

7:0

CnBLP

For n = 1 to 8:

0: input from channel n MIX#1 engine output - normal

operation

1: input from channel (n - 1) biquad #10 output - loop

operation.

C8MXLP

C7MXLP

C6MXLP

C5MXLP

C4MXLP

C3MXLP

C2MXLP

C1MXLP

000

Table 68.

CnMXLP bits

Bit

RST

Name

Description

7:0

CnMXLP

For n = 1 to 8:

0: inputs to channel n MIX#1 engine from interpolation

outputs - normal operation

1: inputs to channel n MIX#1 engine from MIX#2 engine

outputs - loop operation.

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