參數(shù)資料
型號： PE-65966
廠商： Exar Corporation
英文描述： E3/DS3/STS-1 LINE INTERFACE UNIT
中文描述： E3/DS3/STS-1線路接口單元
文件頁數(shù)： 3/55頁
文件大?。?/td> 608K
代理商： PE-65966
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E3/DS3/STS-1 LINE INTERFACE UNIT
XRT7300
REV. 1.1.1
I
TABLE OF CONTENTS
General description ........................................................................................................... 1
FEATURES ................................................................................................................................................. 1
APPLICATIONS .......................................................................................................................................... 1
Figure 1.Block Diagram of the XRT7300............................................................................................................ 1
Ordering Information ......................................................................................................... 2
Figure 2.Pin Out of the XRT7300 in the 44 Pin TQFP........................................................................................ 2
TABLE OF CONTENTS.........................................................................................................I
Pin Description ................................................................................................................... 3
Electrical Characteristics ................................................................................................ 10
DC ELECTRICAL CHARACTERISTICS (TA = 25°C, VDD = 5.0V + 5%, UNLESS OTHERWISE SPECI-
FIED) ............................................................................................................................................................... 10
AC ELECTRICAL CHARACTERISTICS (TA = 25°C, VDD = 5.0V + 5%, UNLESS OTHERWISE SPECI-
FIED) ............................................................................................................................................................... 10
Figure 3.Timing Diagram of the Transmit Terminal Input Interface.................................................................. 11
Figure 4.Timing Diagram of the Receive Terminal Output Interface................................................................ 11
AC ELECTRICAL CHARACTERISTICS (CONTINUED) (TA = 25°C, VDD = 5.0V + 5%, UNLESS OTHER-
WISE SPECIFIED) .......................................................................................................................................... 12
AC ELECTRICAL CHARACTERISTICS (CONTINUED) (TA = 25°C, VDD = 5.0V + 5%, UNLESS OTHER-
WISE SPECIFIED) .......................................................................................................................................... 13
ABSOLUTE MAXIMUM RATINGS .....................................................................................14
Figure 5.Transmit Pulse Amplitude Test Circuit for DS3, E3 and STS-1 Rates............................................... 15
Figure 6.ITU-T G.703 Transmit Output Pulse Template for E3 Applications.................................................... 15
Figure 7.Bellcore GR-499-CORE Transmit Output Pulse Template for DS3 Applications............................... 16
Figure 8.Bellcore GR-253-CORE Transmit Output Pulse Template for SONET STS-1 Applications.............. 16
MICROPROCESSOR SERIAL INTERFACE TIMING (SEE FIGURE 9) .................................................. 17
Figure 9.Timing Diagram for the Microprocessor Serial Interface.................................................................... 17
System Description ......................................................................................................... 18
THE TRANSMIT SECTION ....................................................................................................................... 18
THE RECEIVE SECTION ......................................................................................................................... 18
THE MICROPROCESSOR SERIAL INTERFACE .................................................................................... 18
Table 1:Role of Microprocessor Serial Interface pins when the XRT7300 is operating in the Hardware Mode18
1.0 SELECTING THE DATA RATE ............................................................................................................... 19
Table 2:Selecting the Data Rate for the XRT7300 via the E3 and STS-1/DS3 input pins (Hardware Mode)... 19
COMMAND REGISTER CR4 (ADDRESS = 0X04) .................................................................................. 19
Table 3:Selecting the Data Rate for the XRT7300 Via the STS-1/DS3 and the E3 Bit-fields Within Command
Register CR4 (HOST Mode)................................................................................................................ 19
2.0 THE TRANSMIT SECTION ...................................................................................................................... 20
2.1 T
HE
T
RANSMIT
L
OGIC
B
LOCK
................................................................................................................. 20
Figure 10.The Typical Interface for the Transmission of Data in a Dual-Rail Format From the Transmitting Ter-
minal Equipment to the Transmit Section of the XRT7300 ................................................................ 20
Figure 11.How the XRT7300 Samples the Data on the TPDATA and TNDATA Input Pins............................. 20
Accepting Single-Rail Data from the Terminal Equipment .................................................................. 21
COMMAND REGISTER CR1 (ADDRESS = 0X01) .................................................................................. 21
Figure 12.The Behavior of the TPDATA and TCLK Input Signals While the Transmit Logic Block is Accepting
Single-Rail Data From the Terminal Equipment................................................................................. 21
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