STA321 datasheet(36/157 Pages) STMICROELECTRONICS

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Digital processing stage

STA321

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Doc ID 15351 Rev 3

6.3

Pre-EQ mix 1 and post-EQ mix

The four-channel data, received from the sample rate converters, is sent to Mix1 block to

produce the four mixed-channel data for processing. All this data can be mapped to any

internal processing channel through the appropriate configuration of the RAM memory

locations.

The post-EQ mixer acts in a similar way for the output channels from the processing and

directed to the FFX. It is placed after the delay block which provides a full 4-channel input

mix on every channel.

Figure 17.

Mixers block diagram

Table 19.

Channel mapping

Function

Channel

Memory location (RAM)

Pre mixer

Ch0

from 0x00

Ch1

from 0x04

Ch2

from 0x08

Ch3

from 0x0c

Post mixer

Ch0

from 0x118

Ch1

from 0x11c

Ch2

from 0x120

Ch3

from 0x124

G0_3

G0_2

G0_1

G0_0

ch0_out

ch1_out

ch3_out

ch2_out

ch0_in

ch1_in

ch2_in

ch3_in

ch0_in

ch1_in

ch2_in

ch3_in

ch0_in

ch1_in

ch2_in

ch3_in

ch0_in

ch1_in

ch2_in

ch3_in

pos: 0x119

pos: 0x11A

pos: 0x11B

pos: 0x11C

pos: 0x11D

pos: 0x11E

pos: 0x11Ff

pos: 0x120

pos: 0x121

pos: 0x122

pos: 0x123

pos: 0x124

pos: 0x125

pos: 0x126

pos: 0x127

pre: 0x01

pre: 0x02

pre: 0x03

pre: 0x04

pre: 0x05

pre: 0x06

pre: 0x0C

pre: 0x08

pre: 0x09

pre: 0x0A

pre: 0x0B

pre: 0x0D

pre: 0x0E

pre: 0x07

pre: 0x0F

pre: 0x00

pos: 0x118

G1_0

G1_1

G1_2

G1_3

G2_0

G2_1

G2_2

G2_3

G3_0

G3_1

G3_2

G3_3

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