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XRT7250 Datasheet(PDF) 340 Page - Exar Corporation

Part # XRT7250
Description  DS3/E3 FRAMER IC
PDF  463 Pages
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT7250 Datasheet(HTML) 340 Page - Exar Corporation

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XRT7250
DS3/E3 FRAMER IC
REV. 1.1.1
321
5.3.6
Receive Section Interrupt Processing
The Receive Section of the XRT7250 can generate
an interrupt to the MIcrocontroller/Microprocessor for
the following reasons.
• Change in Receive LOS Condition
• Change in Receive OOF Condition
• Change in Receive LOF Condition
• Change in Receive AIS Condition
• Change in Receive FERF Condition
• Change of Framing Alignment
• Detection of FEBE (Far-End Block Error) Event
• Detection of BIP-4 Error
• Detection of Framing Error
• Reception of a new LAPD Message
5.3.6.1
Enabling Receive Section Interrupts
As mentioned in Section 1.6, the Interrupt Structure
within the XRT7250 contains two hierarchical levels.
• Block Level
• Source Level
The Block Level
The Enable state of the Block level for the Receive
Section Interrupts dictates whether or not interrupts
(if enabled at the source level), are actually enabled.
The user can enable or disable these Receive Sec-
tion interrupts, at the Block Level by writing the appro-
priate data into Bit 7 (Rx DS3/E3 Interrupt Enable)
within the Block Interrupt Enable register (Address =
0x04), as illustrated below.
FIGURE 153. ILLUSTRATION OF THE SIGNALS THAT ARE OUTPUT VIA THE RECEIVE PAYLOAD DATA OUTPUT INTER-
FACE BLOCK
(FOR NIBBLE-PARALLEL MODE OPERATION).
XRT7250 Receive Payload Data I/F Signals
E3 Frame Number N
E3 Frame Number N + 1
Note: RxFrame pulses high to denote
E3 Frame Boundary.
Terminal Equipment Signals
RxOutClk
Rx_Start_of_Frame
Rx_E3_Clock_In
E3_Data_In[3:0]
Overhead Nibble [0]
Overhead Nibble [1]
RxOutClk
RxFrame
RxClk
RxNib[3:0]
Overhead Nibble [0]
Overhead Nibble [1]
Recommended Sampling Edge of Terminal
Equipment
Rx_E3_OH_Ind
RxOH_Ind



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