IDT82P20416 Integrated Device Technology, IDT82P20416 Datasheet - Page 31

• Manufacturer Part Number: IDT82P20416
• Description: 16-channel Short Haul T1/e1/j1 Line Interface Unit
• Manufacturer: Integrated Device Technology

3.3.7
sponding transmitter.
on the transmit line interface (including TTIPn and TRINGn) will be in
High-Z state. The input on the transmit system interface (including TDn,
TDPn, TDNn and TCLK) is ignored. The output on the transmit system
interface will be in High-Z state.
transmitter to achieve steady state, i.e., return to the previous configura-
tion and performance.
Functional Description
IDT82P20416
Set the T_OFF bit (b5, TCF0,...) to ‘1’ will power down the corre-
In this way, the corresponding transmit circuit is turned off. The pins
After clearing the T_OFF bit (b5, TCF0,...), it will take 1 ms for the
TRANSMITTER POWER DOWN
31
16-CHANNEL SHORT HAUL T1/E1/J1 LINE INTERFACE UNIT
3.3.8
channel basis.
state globally:
state on a per-channel basis:
TTIPn and TRINGn can be set to High-Z state globally or on a per-
The following three conditions will set TTIPn and TRINGn to High-Z
• Connecting the OE pin to low;
• Loss of MCLK (i.e., no transition on MCLK for more than 1 ms);
• Power on reset, hardware reset by pulling RST to low for more
The following six conditions will set TTIPn and TRINGn to High-Z
• Writing ‘0’ to the OE bit (b6, TCF0,...);
• Loss of TCLKn in Transmit Single Rail NRZ Format mode or
• Transmitter power down;
• Per-channel software reset by writing ‘1’ to the CHRST bit (b1,
• Setting the THZ_OC bit (b4, TCF0,...) to ‘1’ when transmit driver
1. XCLK is derived from MCLK. It is 1.544 MHz in T1/J1 mode or 2.048 MHz
than 2 µs or global software reset by writing the RST register.
Transmit Dual Rail NRZ Format mode (i.e., no transition on TCLKn
for more than 64 XCLK
Remote Loopback or transmit internal pattern with XCLK;
CHCF,...);
over-current is detected.
in E1 mode.
OUTPUT HIGH-Z ON TTIP AND TRING
1
cycles) except that the channel is in
December 17, 2009