zl50235 Zarlink Semiconductor, zl50235 Datasheet - Page 31

• Manufacturer Part Number: zl50235
• Description: 16 Channel Voice Echo Canceller
• Manufacturer: Zarlink Semiconductor

These peak detector registers allow the user to monitor the error signal peak level. The information is in 16 bit
2’s complement linear coded format presented in two 8 bit registers for each echo canceller. The high byte is in
Register 2 and the low byte is in Register 1.
This register allows the user to program the level of Double-Talk Detection Threshold (DTDT). The 16 bit 2’s
complement linear value defaults to 4800
0 dB. The high byte is in Register 2 and the low byte is in Register 1.
DTDT15
DTDT7
Bit 7
Bit 7
EP15
Bit 7
Bit 7
EP7
Power-up
Power-up
Power-up
Power-up
48
00
N/A
N/A
hex
hex
DTDT14
DTDT6
Bit 6
Bit 6
EP14
Bit 6
Bit 6
EP6
DTDT13
ECA: Double-Talk Detection Threshold Register 2
ECB: Double-Talk Detection Threshold Register 2
ECA: Double-Talk Detection Threshold Register 1
ECB: Double-Talk Detection Threshold Register 1
DTDT5
Bit 5
Bit 5
EP13
Bit 5
Bit 5
EP5
ECA: Error Peak Detect Register 2 (EP)
ECB: Error Peak Detect Register 2 (EP)
ECA: Error Peak Detect Register 1 (EP)
ECB: Error Peak Detect Register 1 (EP)
Functional Description of Register Bits
Functional Description of Register Bits
DTDT12
DTDT4
hex
Bit 4
Bit 4
EP12
Bit 4
Bit 4
= 0.5625 or -5 dB. The maximum value is 7FFF
EP4
Zarlink Semiconductor Inc.
ZL50235
31
DTDT11
DTDT3
Bit 3
Bit 3
EP11
Bit 3
Bit 3
EP3
DTDT10
DTDT2
EP10
Bit 2
Bit 2
Bit 2
Bit 2
EP2
11
31
10
30
15
35
14
34
DTDT9
DTDT1
Bit 1
EP9
Bit 1
EP1
Bit 1
Bit 1
hex
hex
hex
hex
hex
hex
hex
hex
Read Address:
Read Address:
R/W Address:
R/W Address:
R/W Address:
R/W Address:
R/W Address:
R/W Address:
hex
+ Base Address
+ Base Address
+ Base Address
+ Base Address
+ Base Address
+ Base Address
+ Base Address
+ Base Address
= 0.9999 or
Data Sheet
DTDT8
DTDT0
Bit 0
Bit 0
Bit 0
Bit 0
EP8
EP0