参数资料
型号: IDT82V3280
厂商: Integrated Device Technology, Inc.
英文描述: WAN PLL
中文描述: 广域网锁相环
文件页数: 19/167页
文件大小: 1039K
代理商: IDT82V3280
IDT82V3280
WAN PLL
Functional Description
19
June 19, 2006
3
FUNCTIONAL DESCRIPTION
3.1
RESET
The reset operation resets all registers and state machines to their
default value or status.
After power on, the device must be reset for normal operation.
For a complete reset, the
RST
pin must be asserted low for at least
50 μs. After the
RST
pin is pulled high, the device will still be in reset
state for 500 ms (typical). If the
RST
pin is held low continuously, the
device remains in reset state.
3.2
MASTER CLOCK
A nominal 12.8000 MHz clock, provided by a crystal oscillator, is
input on the OSCI pin. This clock is provided for the device as a master
clock. The master clock is used as a reference clock for all the internal
circuits. A better active edge of the master clock is selected by the
OSC_EDGE bit to improve jitter and wander performance.
In fact, an offset from the nominal frequency may input on the OSCI
pin.
This
offset
can
be
NOMINAL_FREQ_VALUE[23:0] bits. The calibration range is within
±741 ppm.
compensated
by
setting
the
The performance of the master clock should meet GR-1244-CORE,
GR-253-CORE, ITU-T G.812 and G.813 criteria.
Table 2: Related Bit / Register in Chapter 3.2
Bit
Register
Address (Hex)
NOMINAL_FREQ_VALUE[23:0]
OSC_EDGE
NOMINAL_FREQ[23:16]_CNFG, NOMINAL_FREQ[15:8]_CNFG, NOMINAL_FREQ[7:0]_CNFG
DIFFERENTIAL_IN_OUT_OSCI_CNFG
06, 05, 04
0A
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