ZL50234GDC ZARLINK [Zarlink Semiconductor Inc], ZL50234GDC Datasheet - Page 17

• Manufacturer Part Number: ZL50234GDC
• Description: 8 Channel Voice Echo Canceller
• Manufacturer: ZARLINK [Zarlink Semiconductor Inc]

Data Sheet
6.4
On power up, the RESET pin must be held low for 100 s. Forcing the RESET pin low will put the ZL50234 in power
down state. In this state, all internal clocks are halted, D<7:0>, Sout, Rout, DTA and IRQ pins are tristated. The 8
Main Control Registers, the Interrupt FIFO Register and the Test Register are reset to zero.
When the RESET pin returns to logic high and a valid MCLK is applied, the user must wait 500 s for the PLL to lock.
C4i and F0i can be active during this period. Once the PLL has locked, the user must power up the 4 groups of echo
cancellers individually, by writing a “1” into the PWUP bit in each group of echo canceller’s Main Control Register.
For each group of echo cancellers, when the PWUP bit toggles from zero to one, echo cancellers A and B execute
their initialization routine. The initialization routine sets their registers, Base Address+00
to the default Reset Value and clears the Adaptive Filter coefficients. Two frames are necessary for the initialization
routine to execute properly.
Once the initialization routine is executed, the user can set the per channel Control Registers, Base Address+00
to Base Address+3F
Power Up Sequence
hex
, for the specific application.
Group 2
Echo
Cancellers
Registers
Group 0
Echo
Cancellers
Registers
Group 1
Echo
Cancellers
Registers
Group 3
Echo
Cancellers
Registers
Channel 4, ECA Ctrl/Stat Registers
Channel 5, ECB Ctrl/Stat Registers
Channel 0, ECA Ctrl/Stat Registers
Channel 1, ECB Ctrl/Stat Registers
Channel 2, ECA Ctrl/Stat Registers
Channel 3, ECB Ctrl/Stat Registers
Channel 6, ECA Ctrl/Stat Registers
Channel 7, ECB Ctrl/Stat Registers
Main Control Registers <7:0>
Interrupt FIFO Register
Test Register
Reserved Test Register
Figure 10 - Memory Mapping
Zarlink Semiconductor Inc.
0080h -->
00A0h -->
0000h -->
0020h -->
0040h -->
0060h -->
01C0h -->
01E0h -->
0400h --> 0407h
0410h
0411h
0412h ---> FFFFh
009Fh
00BFh
001Fh
003Fh
005Fh
007Fh
01DFh
01FFh
hex
to Base Address+3F
ZL50234
hex
hex
17
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