IDT821068PX IDT, Integrated Device Technology Inc, IDT821068PX Datasheet - Page 22

• Manufacturer Part Number: IDT821068PX
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: General Purposer

Specifications of IDT821068PX

• Number Of Adc's: 8
• Number Of Dac's: 8
• Interface Type: Serial
• Power Supply Type: Analog/Digital
• Operating Supply Voltage (min): 4.75V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.25V
• Pin Count: 128
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Screening Level: Industrial
• Package Type: PQFP
• Mounting: Surface Mount
• Lead Free Status / Rohs Status: Not Compliant

EXAMPLES OF GCI COMMANDS
Command are shown in Table 9 and Table 10, respectively.
Table 9 - Local/Global Command Transmission Sequence in GCI
Mode
Table 10 - Coe-RAM/FSK-RAM Command Transmission
Sequence in GCI Mode
Notes:
Global Command.
of each word are ignored; When addressing the FSK-RAM, the data word is 16-bit wide.
IDT821068 OCTAL PROGRAMMABLE PCM CODEC
Program Start byte (81H/91H)
Local/Global Command byte, write
Program Start byte (81H/91H)
Coe-RAM/FSK-RAM Command
byte, write
Data word 1 (Data_H ,Data_L** )
Data word 2 (Data_H ,Data_L )
Data word 8 (Data_H ,Data_L )
Program Start byte (81H/91H)
Coe-RAM/FSK-RAM Command
byte, read
Program Start byte (81H/91H)
Local/Global Command byte, read
Examples of Local/Global Command and Coe-RAM/FSK-RAM
** When addressing the Coe-RAM, the data word is 14-bit wide, the lowest two bits in Data_L
* The number of the data bytes can be 1 to 4 depending on the two bits ‘b1b0’ of the Local/
Data byte 1
Data byte m*
.
.
.
.
.
.
Downstream
Downstream
GCI Monitor Channel
GCI Monitor Channel
Program Start byte (81H/91H)
Data word 1 (Data_H ,Data_L** )
Data word 2 (Data_H ,Data_L )
Data word 8 (Data_H ,Data_L )
Program Start byte (81H/91H)
Data byte 1
Data byte m*
.
.
.
.
.
.
Upstream
Upstream
22
POWER-ON SEQUENCE
DEFAULT STATE AFTER RESET
or by GCI/MPI Command, the device defaults to the following state:
In this way, the RAM data will not be lost unless the device is powered
down physically.
To power on IDT821068, users should follow this sequence:
1.
2.
3.
4.
5.
When the IDT821068 is powered on, or reset either by RESET pin
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. All interrupts are disabled, all pending interrupts are cleared;
11. All feature function blocks including FSK, Dual Tone, Teletax,
12. CHCLK1 and CHCLK2 are set to be high.
The data stored in RAM will not be changed by any kind of resets.
Apply ground first;
Apply VCC, finish signal connections and set RESET low, thus
the device goes into default state;
Set RESET high;
Select master clock frequency;
Program filter coefficients and other parameters as required.
All eight channels are powered down and in standby mode;
All loopbacks and cutoff are disabled;
DX1/DU pin is selected for all channels to transmit data, DR1/
DD pin is selected for all channels to receive data;
The master clock frequency is 2.048 MHz;
For MPI operation, transmit and receive time slots are set to 0-
7 respectively for channel 1-8. The PCM data rate is the same
as Bit Clock frequency. Data is transmitted on rising edges and
received on falling edges;
For GCI operation, time slots for transmitting and receiving are
determined by TS pin. Data rate is determined by DOUBLE
pin. DD, DU clocks data on rising edges of DCL.
A-Law is selected;
Coefficients of FRX, FRR, GTX and GTR are set to be default
values. The analog gains are set to be 0 dB. IMF, GIS and
ECF are disabled. HPF is enabled (See Figure 9: Signal Flow
of Each Channel);
SB1 and SB2 are configured as inputs;
SI1 and SI2 are configured as no debounce;
Ring Trip and Level Metering are turned off;
INDUSTRIAL TEMPERATURE RANGE