STA321TR 查看數據表（PDF） - STMicroelectronics

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STA321TR

4-channel digital audio system with FFX™ driver

STMicroelectronics 

Digital processing stage

STA321

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.

Table 19. Channel mapping

Function

Channel

Memory location (RAM)

Ch0

Ch1

Pre mixer

Ch2

Ch3

Ch0

Ch1

Post mixer

Ch2

Ch3

from 0x00

from 0x04

from 0x08

from 0x0c

from 0x118

from 0x11c

from 0x120

from 0x124

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

ch0_in

pre: 0x00

pos: 0x118

G0_0

ch0_in

pre: 0x08

pos: 0x120

G2_0

ch1_in

ch2_in

pre: 0x01

pos: 0x119

G0_1

ch0_out

+

pre: 0x02

pos: 0x11A

G0_2

ch1_in

ch2_in

pre: 0x09

pos: 0x121

G2_1

+

pre: 0x0A

pos: 0x122

G2_2

ch2_out

ch3_in

pre: 0x03

pos: 0x11B

G0_3

ch3_in

pre: 0x0B

pos: 0x123

G2_3

ch0_in

ch1_in

ch2_in

ch3_in

pre: 0x04

pos: 0x11C

G1_0

pre: 0x05

pos: 0x11D

G1_1

ch1_out

+

pre: 0x06

pos: 0x11E

G1_2

pre: 0x07

pos: 0x11Ff

G1_3

ch0_in

ch1_in

ch2_in

ch3_in

pre: 0x0C

pos: 0x124

G3_0

pre: 0x0D

pos: 0x125

G3_1

+

pre: 0x0E

pos: 0x126

G3_2

ch3_out

pre: 0x0F

pos: 0x127

G3_3

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Doc ID 15351 Rev 3

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