參數(shù)資料
型號(hào): XRT79L72IB
廠商: EXAR CORP
元件分類: 數(shù)字傳輸電路
英文描述: 2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
中文描述: ATM NETWORK INTERFACE, PBGA456
封裝: 27 X 27 MM, 1 MM PITCH, PLASTIC, BGA-456
文件頁數(shù): 24/72頁
文件大小: 441K
代理商: XRT79L72IB
XRT79L72
REV. P1.0.2
PRELIMINARY
2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
xr
21
B10
TxUClk/
TxPClk
I
Transmit UTOPIA Interface Clock/Transmit POS-PHY Interface Clock Input:
The function of this input pin depends upon whether the XRT79L72 has been
configured to operate in the ATM UNI or in the PPP Mode.
ATM UNI Mode - TxUClk:
The Transmit UTOPIA Interface clock is used to latch the data on the Transmit
UTOPIA Data bus, into the Transmit UTOPIA Interface block. This clock signal
is also used as the timing source for circuitry used to process the ATM cell data
into and through the TxFIFO.
During Multi-PHY operation, the data on the Transmit UTOPIA Address bus pins
is sampled on the rising edge of TxUClk.
PPP Mode - TxPClk:
The Transmit POS-PHY Interface clock is used to latch the data on the Transmit
POS-PHY Data bus, into the Transmit POS-PHY Interface block. This clock sig-
nal is also used as the timing source for circuitry used to process the Packet data
into and through the TxFIFO.
N
OTE
:
The XRT79L72 device can support TxUClk or TxPClk clock frequencies
of up to 50MHz.
P
IN
#
N
AME
TYPE
D
ESCRIPTION
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