IDT82P20416 Integrated Device Technology, IDT82P20416 Datasheet - Page 47

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

3.6
3.6.1
the clocks required by internal circuits and CLKT1/CLKE1 outputs.
MCLK should be a clock with +/-32 ppm (in T1/J1 mode) or +/-50 ppm
(in E1 mode) accuracy. The clock frequency of MCLK is 1.544/2.048 X N
MHz (1 ≤ N ≤ 8, N is an integer number), as determined by
MCKSEL[3:0]. Refer to Chapter 2 Pin Description for details.
MCLK). The output of CLKT1 is determined by the CLKT1_EN bit (b1,
CLKG) and the CLKT1 bit (b0, CLKG). Refer to Table-21. The output of
CLKE1 is determined by the CLKE1_EN bit (b3, CLKG) and the CLKE1
bit (b2, CLKG). Refer to Table-22.
Functional Description
IDT82P20416
The IDT82P20416 provides two kinds of clock outputs:
• Free running clock outputs on CLKT1 and CLKE1
The following Clock Input is provided:
• MCLK as programmable reference timing for the IDT82P20416.
An internal clock generator uses MCLK as reference to generate all
The outputs on CLKT1 and CLKE1 are free running (locking to
CLOCK INPUTS AND OUTPUTS
FREE RUNNING CLOCK OUTPUTS ON CLKT1/CLKE1
47
16-CHANNEL SHORT HAUL T1/E1/J1 LINE INTERFACE UNIT
Table-21 Clock Output on CLKT1
Table-22 Clock Output on CLKE1
CLKE1_EN
CLKT1_EN
0
1
0
1
Control Bits
Control Bits
(don’t-care)
(don’t-care)
CLKT1
CLKE1
0
1
0
1
Clock Output On CLKT1
Clock Output On CLKE1
December 17, 2009
1.544 KHz
2.048 KHz
High-Z
High-Z
8 KHz
8 KHz