XRT7300IV Просмотр технического описания (PDF) - Exar Corporation

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XRT7300IV

E3/DS3/STS-1 LINE INTERFACE UNIT

Exar Corporation 

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E3/DS3/STS-1 LINE INTERFACE UNIT

XRT7300

TABLE OF CONTENTS

REV. 1.1.1

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 Mode 18

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 THE TRANSMIT LOGIC BLOCK ................................................................................................................. 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

I

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