IDT82P2282 Integrated Device Technology, Inc., IDT82P2282 Datasheet - Page 106

• Manufacturer Part Number: IDT82P2282
• Description: 2 Channel T1/J1/E1 Transceiver
• Manufacturer: Integrated Device Technology, Inc.

IDT82P2282
4
4.1
4.2
values.
power-up and the low signal should last at least 10 ms to initialize the
device. After the RESET pin is asserted high, all the registers are in their
default values and can be accessed after 2 ms (refer to Figure 36).
software anytime. When it is hardware reset, the RESET pin should be
asserted low for at least 100 ns. Then all the registers are in their default
values and can be accessed after 2 ms (refer to Figure 37). When it is
software reset, a write signal to the Software Reset register will reset all
the registers except the T1/J1 Or E1 Mode register to their default val-
ues. Then the registers are accessible after 2 ms. However, the T1/J1
Or E1 Mode register can not be reset by the software reset. It can only
be reset by the hardware reset.
the OSCI pin is available.
Mode register is changed, a software reset must be applied.
Operation
Microprocessor
To power on the device, the following sequence should be followed:
1. Apply ground;
2. Apply 3.3 V;
3. Apply 1.8 V.
When the device is powered-up, all the registers contain random
The hardware reset pin RESET must be asserted low during the
During normal operation, the device can be reset by hardware or
Hardware or software reset can only be applied when the clock on
It should be mentioned that when the setting in the T1/J1 Or E1
Figure 36. Hardware Reset When Powered-Up
Interface
RESET
OPERATION
Vdd
POWER-ON SEQUENCE
RESET
10ms
2ms
access
95
4.3
ting the R_OFF bit. During the receive path power down, the output of
the corresponding path is low.
by the T_OFF bit. During the transmit path power down, the output of the
corresponding path is High-Z.
DUAL T1/E1/J1 LONG HAUL / SHORT HAUL TRANSCEIVER
Microprocessor
Figure 37. Hardware Reset In Normal Operation
The receive path of any of the two links can be power down by set-
The transmit path of any of the two links can be set to power down
Interface
RESET
RECEIVE / TRANSMIT PATH POWER DOWN
100 ns
2ms
October 7, 2003
access