XRT7250 datasheet(13/463 Pages) EXAR

13 / 463 page

XRT7250

DS3/E3 FRAMER IC

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REV. 1.1.1

Figure 35.Behavior of the Microprocessor Interface signals, during the Initial Write Operation of a Burst Cycle

(Motorola-type Processor) .............................................................................................................................. 50

Figure 36.Behavior of the Microprocessor Interface Signals, during subsequent Write Operations with the Burst

I/O Cycle (Motorola-type µC/µP) ..................................................................................................................... 51

Figure 37.Schematic depicting how to interface the XRT7250 DS3/E3 Framer IC to the 8051 Microcontroller ..

120

Figure 38.Schematic Depicting how to interface the XRT7250 DS3/E3 Framer IC to the MC68000 Microproces-

sor ................................................................................................................................................................. 121

Figure 39.Schematic Depicting how to interface the XRT7250 DS3/E3 Framer IC to the XRT7300 DS3/E3/STS-

1 LIU IC ......................................................................................................................................................... 123

Figure 40.DS3 Frame Format for C-bit Parity ............................................................................................... 127

Figure 41.DS3 Frame Format for M13 .......................................................................................................... 128

Figure 42.A Simple Illustration of the Transmit Section, within the XRT7250, when it has been configured to op-

erate in the DS3 Mode .................................................................................................................................. 132

Figure 43.A Simple Illustration of the Transmit Payload Data Input Interface Block ..................................... 133

Figure 44.Illustration of the Terminal Equipment being interfaced to the Transmit Payload Data Input Interface

block (of the XRT7250) for Mode 1(Serial/Loop-Timing) Operation .............................................................. 136

Figure 45.Behavior of the Terminal Interface signals between the Transmit Payload Data Input Interface block

of the XRT7250 and the Terminal Equipment (for Mode 1 Operation) ......................................................... 137

Figure 46.Illustration of the Terminal Equipment being interfaced to the Transmit Payload Data Input Interface

block of the XRT7250 for Mode 2 (Serial/Local-Timed/Frame-Slave) Operation .......................................... 138

Figure 47.Behavior of the Terminal Interface signals between the XRT7250 and the Terminal Equipment (Mode

2 Operation) .................................................................................................................................................. 139

Figure 48.Illustration of the Terminal Equipment being interfaced to the Transmit Payload Data Input Interface

block of the XRT7250 for Mode 3 (Serial/Local-Timed/Frame-Master) Operation ........................................ 140

Figure 49.Behavior of the Terminal Interface signals between the XRT7250 and the Terminal Equipment (DS3

Mode 3 Operation) ........................................................................................................................................ 141

Figure 50.Illustration of the Terminal Equipment being interfaced to the Transmit Payload Data Input Interface

block of the XRT7250 for Mode 4 (Nibble-Parallel/Loop-Timed) Operation .................................................. 142

Figure 51.Behavior of the Terminal Interface signals between the XRT7250 and the Terminal Equipment (Mode

4 Operation) .................................................................................................................................................. 143

Figure 52.Illustration of the Terminal Equipment being interfaced to the Transmit Payload Data Input Interface

block of the XRT7250 for Mode 5 (Nibble-Parallel/Local-Timed/Frame-Slave) Operation ........................... 145

Figure 53.Behavior of the Terminal Interface signals between the XRT7250 and the Terminal Equipment (DS3

Mode 5 Operation) ........................................................................................................................................ 146

Figure 54.Illustration of the Terminal Equipment being interfaced to the Transmit Payload Data Input Interface

block of the XRT7250 for Mode 6 (Nibble-Parallel/Local-Timed/Frame-Master) Operation ......................... 147

Figure 55.Behavior of the Terminal Interface signals between the XRT7250 and the Terminal Equipment (DS3

Mode 6 Operation) ........................................................................................................................................ 148

Figure 56.Simple Illustration of the Transmit Overhead Data Input Interface block ...................................... 149

Figure 57.Illustration of the Terminal Equipment being interfaced to the Transmit Overhead Data Input Interface

(Method 1) ..................................................................................................................................................... 152

Figure 58.Illustration of the signal that must occur between the Terminal Equipment and the XRT7250, in order

to configure the XRT7250 to transmit a Yellow Alarm to the remote terminal equipment ............................. 155

Figure 59.Illustration of the Terminal Equipment being interfaced to the Transmit Overhead Data Input Interface

(Method 2) ..................................................................................................................................................... 157

Figure 60.Behavior of Transmit Overhead Data Input Interface signals between the XRT7250 and the Terminal

Equipment (for Method 2) ............................................................................................................................. 160

Figure 61.A Flow Chart depicting how to transmit a FEAC Message via the FEAC Transmitter .................. 162

Figure 62.LAPD Message Frame Format ..................................................................................................... 163

Figure 63.Flow Chart depict how to use the LAPD Transmitter .................................................................... 166

Figure 64.A Simple Illustration of the Transmit DS3 Framer Block and the associated paths to other Functional

Blocks ........................................................................................................................................................... 168

Figure 65.Approach to Interfacing the XRT7250 Framer IC to the XRT7300 DS3/E3/STS-1 Transmitter LIU ....

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