
IDT82P2916
16-CHANNEL HIGH-DENSITY T1/E1/J1 LINE INTERFACE UNIT
Pin Description
19
April 24, 2010
OE
Input
V11
OE: Output Enable
OE enables or disables all Line Drivers globally.
A high level on this pin enables all Line Drivers while a low level on this pin places all Line
Drivers in High-Z state and independent from related register settings.
Note that the functionality of the internal circuit is not affected by OE.
If this pin is not used, it should be tied to VDDIO.
This pin can be used to control the transmit impedance state for Hitless protection applica-
TEHWE
Input
(Pull-Up)
V12
TEHWE: Hardware T1/J1 or E1 Mode Selection Enable
When this pin is open, the T1/J1 or E1 operation mode is selected by TEHW globally.
When this pin is low, the T1/J1 or E1 operation mode is selected by the T1E1 bit (b0,
CHCF,...) on a per-channel basis.
TEHW
Input
(Pull-Up)
AB10
TEHW: Hardware T1/J1 or E1 Mode Selection
When TEHWE is open, this pin selects the T1/J1 or E1 operation mode globally:
Low - E1 mode;
Open - T1/J1 mode.
When TEHWE is low, the input on this pin is ignored.
GPIO[0]
GPIO[1]
Output / Input
V10
AA10
GPIO: General Purpose I/O [1:0]
These two pins can be defined as input pins or output pins by the DIR[1:0] bits (b1~0,
GPIO)respectively.
When the pins are input, their polarities are indicated by the LEVEL[1:0] bits (b3~2,
GPIO)respectively.
When the pins are output, their polarities are controlled by the LEVEL[1:0] bits (b3~2,
GPIO)respectively.
RST
Input
AA11
RST: Reset (Active Low)
A low pulse on this pin resets the device. This hardware reset process completes in 2 s max-
MCU Interface
INT
Output
AB13
INT: Interrupt Request
This pin indicates interrupt requests for all unmasked interrupt sources.
The output characteristics (open drain or push-pull internally) and the active level are deter-
mined by the INT_PIN[1:0] bits (b3~2,
GCF).CS
Input
V13
CS: Chip Select (Active Low)
This pin must be asserted low to enable the microprocessor interface.
A transition from high to low must occur on this pin for each Read/Write operation and CS
should remain low until the operation is over.
SCLK
Input
AB12
SCLK: Shift Clock
In Serial microprocessor interface, this multiplex pin is used as SCLK.
SCLK inputs the shift clock for the Serial microprocessor interface. Data on SDI is sampled by
the device on the rising edge of SCLK. Data on SDO is updated on the falling edge of SCLK.
SDI
Input
W13
SDI: Serial Data Input
In Serial microprocessor interface, this multiplex pin is used as SDI.
Address and data on this pin are serially clocked into the device on the rising edge of SCLK.
SDO
Output
AA12
SDO: Serial Data Output
In Serial microprocessor interface, this multiplex pin is used as SDO.
Data on this pin is serially clocked out of the device on the falling edge of SCLK.
Name
I / O
Pin No.
Description