參數(shù)資料
型號： IDT77155L155PX
廠商： INTEGRATED DEVICE TECHNOLOGY INC
元件分類： 數(shù)字傳輸電路
英文描述： PHY (TC-PMD) USER NETWORK INTERFACE FOR 155 MBPS ATM NETWORK APPLICATIONS
中文描述： ATM NETWORK INTERFACE, PQFP128
封裝： 20 X 14 MM, PLASTIC, QFP-128
文件頁數(shù)： 16/50頁
文件大?。?/td> 307K
代理商： IDT77155L155PX
8.03
16
IDT77155
155Mbps ATM PHY (TC-PMD) USER NETWORK INTERFACE
ADVANCED INFORMATION
Commercial Temperature Range
OPERATION MODES
MULTI-PHY OPERATION
Multiple IDT77155s may be connected to common bus
when a Multi-PHY system architecture is needed.
Both Transmit and Receive UTOPIA busses, as well as the
utility bus, can attach to common busses.
Device selection is controlled via the UTOPIA “enable”
control signals ( TWRENB, RRDENB) and Multi-PHY ad-
dressing signals (TXADDR[1:0], RXADDR[1:0]). In transmit,
TWRENB tells the selected device (selected by TXADDR[1:0])
that the data and control signals it sees are to be used for ATM
cell transmission. In receive, when RRDENB is not asserted
(active low), RDAT[7:0], RXPRTY, RSOC, and RCA are all tri-
stated, allowing them to share a common bus. When RRDENB
is asserted, the selected device (selected by RXADDR[1:0])
drives these outputs, transferring the data to the upstream
hardware.
Loopback
The IDT77155 supports two loopback functions that are
enabled by control bits in the control register.
Local Loopback
The local loopback mode provides a connection within the
PHY between transmit and receive data. This loopback con-
nects the high speed transmit data and clock to the high speed
receive data and clock as shown in Figure 9. Note that while
this mode is operating, no data is forwarded to or received
from the line interface.
Line Loopback
The line loopback might also be called “remote loopback”
since it provides for a means to test the overall system,
including the line. The line loopback connects the high speed
receive data and clock to the transmit data and clock as shown
in Figure 10.
"Upstream"
Hardware
77155#1
Optical
Transceiver
77155#2
77155#3
77155#4
"UTOPIA Transmit Bus"
—TDAT[7:0]
—TXPRTY
—TSOC
—TXADDR[1:0]
77155 drw 12
12
12
12
12
12
Optical
Transceiver
Optical
Transceiver
Optical
Transceiver
TCA
"Upstream"
Hardware
77155#1
Optical
Transceiver
77155#2
77155#3
77155#4
"UTOPIA Receive Bus"
—RDAT[7:0]
—RXPRTY
—RSOC
—RXADDR[1:0]
77155 drw 13
12
12
12
12
12
Optical
Transceiver
Optical
Transceiver
Optical
Transceiver
RCA
Figure 7. Multi-PHY: Transmit Direction
Figure 8. Multi-PHY: Receive Direction
相關(guān)PDF資料
PDF描述
IDT77301 UTOPIAFIFO 1 TO 4 (128 x 9 x 4) DEMULTIPLEXER-FIFO
IDT77301L12PF UTOPIAFIFO 1 TO 4 (128 x 9 x 4) DEMULTIPLEXER-FIFO
IDT77301L12PFI UTOPIAFIFO 1 TO 4 (128 x 9 x 4) DEMULTIPLEXER-FIFO
IDT77305 UTOPIAFIFO 4 PORT MULTIPLEXER FIFO
IDT77911 Octal Transceivers And Line/MOS Drivers With 3-State Outputs 20-PDIP -40 to 85
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