參數(shù)資料
型號(hào): IDT82P2828BH
廠商: IDT, Integrated Device Technology Inc
文件頁(yè)數(shù): 138/154頁(yè)
文件大?。?/td> 0K
描述: IC LIU T1/J1/E1 28+1CH 640-PBGA
標(biāo)準(zhǔn)包裝: 5
類型: 線路接口裝置(LIU)
規(guī)程: E1
電源電壓: 3.13 V ~ 3.47 V
安裝類型: 表面貼裝
封裝/外殼: 640-BGA 裸露焊盤
供應(yīng)商設(shè)備封裝: 640-PBGA-EP(31x31)
包裝: 托盤
其它名稱: 82P2828BH
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IDT82P2828
28(+1) CHANNEL HIGH-DENSITY T1/E1/J1 LINE INTERFACE UNIT
Programming Information
84
February 6, 2009
3
FREE
This bit is valid only when the selected clock source for REFA passes the internal Frequency Synthesizer
In normal operation:
0: Output the clock which is locked to the selected clock source and the frequency is programmed in the FREQ[2:0] bits (b2~0,
REFCF). (default)
1: Output free running clock which is locked to MCLK and the frequency is programmed in the FREQ[2:0] bits (b2~0, REFCF).
When the selected clock source is lost, this bit, together with the FS_BYPAS bit (b4, REFCF) and the REFH bit (b5, REFCF),
controls the output on REFA:
2 - 0
FREQ[2:0]
These bits are valid only when the Frequency Synthesizer on REFA is enabled. These bits determine the output clock frequency.
Selected Clock
Source
FS_BYPA
S
FREE
REFH
Output On REFA
CLKA
0
(don’t-
care)
High level.
1
Free running clock, whose frequency is programmed
in the FREQ[2:0] bits (b2~0, REFCF).
1
(don’t-care)
High level.
Recovered clock of
one of the 29 chan-
nels.
0
Free running clock, whose frequency is programmed
in the FREQ[2:0] bits (b2~0, REFCF).
1
High level.
1
(don’t-
care)
Free running clock, whose frequency is programmed
in the FREQ[2:0] bits (b2~0, REFCF).
1
(don’t-
care)
0
Free running clock, whose frequency is 1.544 MHz in
T1 mode or 2.048 MHz in E1 mode.
1
High level.
FREQ[2:0]
Output when FS_BYPAS=0, FREE=0 and the
Frequency Synthesizer uses RCLKn or CLKA as
reference clock
Output when FS_BYPAS=0 and FREE=1
(the Frequency Synthesizer is free running)
0 0 0
1.544 MHz if the selected clock source is 1.544 MHz; or
2.048 MHz if the selected clock source is 2.048 MHz
-
0 0 1
8 kHz
0 1 0
64 kHz
0 1 1
Reserved
-
1 0 0
4.096 MHz
1 0 1
8.192 MHz
1 1 0
19.44 MHz
1 1 1
32.768 MHz
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