XRT7250 Datasheet, PDF (13/463 Pages) Exar Corporation – DS3/E3 FRAMER IC

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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