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XRT7250 데이터시트(PDF) 350 Page - Exar Corporation |
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XRT7250 데이터시트(HTML) 350 Page - Exar Corporation |
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350 / 463 page ![]() áç áç áç áç XRT7250 DS3/E3 FRAMER IC REV. 1.1.1 331 Writing a “1” into this bit-field enables the Receive LAPD Message Interrupt. Conversely, writing a “0” into this bit-field disables the Receive LAPD Message Interrupt. Servicing the Receive LAPD Message Interrupt Whenever the XRT7250 Framer IC generates this in- terrupt, it will do the following. • It will assert the Interrupt Request output pin (INT), by driving it “Low”. • It will set Bit 0 (RxLAPD Interrupt Status), within the Rx E3 LAPD Control register to “1”, as indicated below. • It will write the contents of the newly Received LAPD Message into the Receive LAPD Message buffer (located at 0xDE through 0x135). Whenever the Terminal Equipment encounters the Receive LAPD Message Interrupt, then it should read out the contents of the Receive LAPD Message buff- er, and respond accordingly. RXE3 LAPD CONTROL REGISTER (ADDRESS = 0X18) BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0 Not Used RxLAPD Enable RxLAPD Interrupt Enable RxLAPD Interrupt Enable RO RO RO RO RO R/W R/W RUR 00000 0 0 0 |
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