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TITLE 550APP.ASM - NS16550A INITIALIZATION ;ESTABLISH NS16550A REGISTER ADDRESS/DATA EQUATES ;************ UART REGISTERS ************************ rxd EQU 3F8H ;RECEIVE DATA REG txd EQU 3F8H ;TRANSMITT DATA REG ier EQU 3F9H ;INTERRUPT ENABLE REG dll EQU 3F8H ;DIVISOR LATCH LOW dlh EQU 3F9H ;DIVISOR LATCH HIGH iir EQU 3FAH ;INTERRUPT IDENTIFICATION REG fer EQU 3FAH ;FIFO CONTROL REG ler EQU 3FBH ;LINE CONTROL REG mer EQU 3FCH ;MODEM CONTROL REG lsr EQU 3FDH ;LINE STATUS REG msr EQU 3FEH ;MODEM STATUS REG ser EQU 3FFH ;SCRATCH PAD REG ;**************** DATA EQUATES ***************** bufs1ze EQU 7CFH dosrout EQU 25H intnum EQU OCH ieumask EQU OEFH divaee EQU 80H lowdiv EQU 06H uppdiv EQU OOH dataspe EQU lAH fifospe EQU OC1H setout2 EQU 08H intmask EQU OFH ;TX AND RX BUFFER SIZE ;DOS ROUTINE SPECIFICATION ;INTERRUPT NUMBER (OCH = COM1) ;ICU INTERRUPT ENABLE MASK ;DIVISOR LATCH ACCESS CODE ;LOWER DIVISOR ;UPPER DIVISOR ;DLAB = 0, 7 BITS, 1 STOP, EVEN ;FIFOS ENABLED, TRIG = 14, DMA MODE = 0 ;SETTING OUT2 ENABLES INTRa TO THE ICU ;UART INTERRUPT ENABLE MASK ;*********** ESTABLISH CODE AND DATA SEGMENTS ****************** eseg INIT: SEGMENT PARA PUBLIC "code" ORG lOOH ASSUME CS:eseg,DS:cseg PUSH CS POP DS JMP START ;********* ESTABLISH DATA BUFFERS AND RAM REGISTERS ******** msflag DB txflag DB sbuf DB rbuf DB sbufe EQU rbufe EQU 0 0 bufsize DUP ("S") bufsize DUP ("R") sbuf + bufsize rbuf + bufsize STRING BUFFER RECEIVE BUFFER END OF STRING BUFFER END OF RECEIVE BUFFER START: CLI ;»> DISABLE CPU INTERRUPTS «< 4-63
.,... en .., :Z > > ENABLE CPU INTERRUPTS < < < 4-64
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~ National ~ Semiconductor 400014 R
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TRADEMARKS Following is the most cu
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II) c ~ ~National ~ ~ Semiconductor
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Table of Contents (Continued) Secti
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Alpha-Numeric Index(continUed) DS36
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Section 1 Local Area Networks IEEE
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~National ~ Semiconductor DP8390C/N
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3.0 Functional Description (Continu
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5.0 Pin Descriptions (Continued) BU
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6.0 Direct Memory Access Control (D
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7.0 Packet Reception (Continued) Re
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8.0 Packet Transmission (Continued)
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10.0 Internal Registers (Continued)
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.----------------------------------
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12.0 Loopback Diagnostics (Continue
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13.0 Bus Arbitration and Timing The
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13.0 Bus Arbitration and Timing (Co
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15.0 Switching Characteristics AC S
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15.0 Switching Characteristics (Con
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AC Timing Test Conditions Input Pul
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2.0 Block Diagram COL CRS PROTOCOL
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4.0 Transmit/Receive Packet Encapsu
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5.0 Pin Descriptions (Continued) BU
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7.0 Packet Reception (Continued) fo
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7.0 Packet Reception (Continued) Er
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9.0 Remote DMA The Remote DMA chann
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11.0 Initialization Procedures (Con
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13.0 Bus Arbitration and Timing The
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15.0 Switching Characteristics AC S
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AC Timing Test Conditions Input Pul
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2.0 Block Diagram TRANSCEIVER CABLE
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PCC Connection Diagram 39.0. 39.0.
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6.0 Absolute Maximum Ratings Recomm
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9.0 Timing and Load Diagrams (Conti
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2.0 Block Diagram COAX CABLE r ____
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~~L ~------------------------------
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6.0 Absolute Maximum Ratings (Note
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I: • • • • • • Interrup
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PAL20LB Decode and DMA Interface Lo
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~ U16/8 R1 R1,R2=4.7k.o. Note: For
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Although Cheapernet is intended for
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The transmitted packet from the SNI
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Truth Table for Various Collision D
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CHEAPERNET APPLICATION WITH THE DP8
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DP8390 Network Interface Controller
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ping between the received address a
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If the current local DMA address ev
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6.2 Dual Port Memory One popular me
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StarLAN With The DP839EB Evaluation
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SUPPORTING DOCUMENTS The following
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Pulse Transformer U3 .----. j " "P>
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ELECTROSTATIC DISCHARGE TEST (ESD)
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Section 2 Contents DP8340INS32440 I
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.. 0 C'I C") en .... z 0 C") GO Go
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~ 'OIl' N CO) (J) Z .... o 'OIl' CO
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Timing Characteristics Oscillator F
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Timing Waveforms (Continued) TA REG
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.. ... ~ ~National ~ ~ Semiconduc
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Detailed Functional Pin Description
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Message Format (Continued) DATA REC
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Timing Characteristics (Notes 2, 6,
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Timing Waveforms (Continued) 4T±(T
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Typical Applications (Continued) +5
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N r--------------------------------
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~ ..,. r---------------------------
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Timing Characteristics (Continued)
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Functional Timing Waveforms (Contin
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Typical Applications (Continued) DA
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C") "Ot "Ot N C") en ...... z C") "
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Absolute Maximum Ratings (Note 1) I
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(W) r------------------------------
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MUX~ __________________ The BIPLAN
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U) ,-------------------------------
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~ .--------------------------------
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An EPROM implementation was selecte
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MASTER MUL TIPLEXING/DE-MUL TIPLEXI
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AN·496 '" 0, '" (U17/ (U23/6) TO 5
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AN-496 t W19 ~ J2-43 I' [; 0 J2-42
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AN·496
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DP8342/DP8343 HIGH SPEED INTERFACE
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2.0 Connection Diagram A13- 12 A12-
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3.0 Pin Descriptions (Continued) Si
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~ ~ 4.0 Electrical Specifications (
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4.0 Electrical Specifications (Cont
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~ ~ 4.0 Electrical Specifications (
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c( '
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~L ______________ ___ ~ ~ 4.0 Elect
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5.0 Instruction Set Overview (Conti
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6.0 Instruction Set Reference (Cont
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~ ,--------------------------------
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~ C') 6.0 Instruction Set Reference
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! 6.0 Instruction Set Reference (Co
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~ ~ 6.0 Instruction Set Reference (
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== ~ 6.0 Instruction Set Reference
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7.0 CPU Registers (Continued) BIT I
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7.0 CPU Registers (Continued) BIRO
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7.0 CPU Registers (Continued) 76543
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7.0 CPU Registers (Continued) BIT D
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7.0 CPU Registers (Continued) BIT D
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8.0 Remote Interface and Arbitratio
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~ ~ HASM state TCU state eLK-OUT RE
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~I tn tn ...._,__'RS A RS, RSC IMEM
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~ 01 CO RASM stat. TCU stat. CLK-OU
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~ ~ I\~"'''' I 'ow = "[OW2-0) , RS
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~ 8l HASM stat. TCU stat. CU- C» b
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.----------------------------------
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10.0 Transceiver (Continued) (a) 32
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10.0 Transceiver (Continued) TABLE
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10.0 Transceiver (Continued) dotted
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10.0 Transceiver (Continued) TABLE
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10.0 Transceiver (Continued) {also
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-----------------------------------
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Decoding Bit Fields with the JRMK I
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Receiver Interrupts/Flags for the D
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****************DA ISR*************
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"Interrupts"-A Powerful Tool of the
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TABLE II. (lCR) Interrupt Mask Bits
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Running the DP8344 with wait states
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» z I U'I Q 01:00 INSTRUCTION ADDR
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WHY EPROM SOFT-LOAD? In a stand-alo
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RESET ~. Timing at Beginning of Ins
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.. I CRYSTAL ~~~.~ I UP TO 64K OP83
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The roll-off frequency, Fro, should
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ceives messages whose first frame a
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RECEIVER INTERRUPT The receiver int
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JMP n LJMP n JMPR Rs JMPI Ptr JRMK
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00044 F90a :J- 226 Z • 227 MOVE A
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l> Z 00074 80BD 2'18 en • 00075 0
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Section 3 ISDN Components
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Introduction To National Semiconduc
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NSC Solutions for Layers 2 and 3 Na
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NSC Solutions: Systems Level Basic
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~National ~ Semiconductor PRELIMINA
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ISDN DEFINITIONS "B" Channel, or DS
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~ '" TE2 UP TO 8 TERMINALS -
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Section 4 Contents INS8250/INS8250-
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m . r------------------------------
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3.0 AC Electrical Characteristics T
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. ID
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5.0 Block Diagram INTERNAL DATA IUS
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Page 425 and 426: ~ &I) o N m Z ::::: o &I) 'Of' o co
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Page 430 and 431: 4.0 Timing Waveforms (Continued) Re
Page 432 and 433: 6.0 Pin Descriptions (Continued) Re
Page 434 and 435: 8.0 Registers The system programmer
Page 436 and 437: 8.0 Registers (Continued) 8.3 PROGR
Page 438 and 439: 8.0 Registers (Continued) Table II
Page 440 and 441: 9.0 Typical Applications (Continued
Page 442 and 443: Table of Contents 1.0 ABSOLUTE MAXI
Page 444 and 445: 3.0 AC Electrical Characteristics T
Page 446 and 447: 4.0 Timing Waveforms (Continued) Wr
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Page 450 and 451: 5.0 Block Diagram AO A, A2 CSD CSI
Page 452 and 453: 6.0 Pin Descriptions (Continued) tr
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Page 456 and 457: 8.0 Registers (Continued) 8.3 PROGR
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Page 460 and 461: '" .j>. 01 PHil This shows the basi
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Page 464 and 465: 3. The Rx FIFO will hold 16 bytes r
Page 466 and 467: NS16550A E-J r-o ..... IRQ4 ICU CPU
Page 470 and 471: 3.0 Board to Board Communications w
Page 472 and 473: DIAPPS.ASM Flow Chart l> z • ~ CO
Page 474 and 475: » z I "" CD RDAI: DISABLE IRTS, SE
Page 476 and 477: COMPARE: SET UP COMPARE BUffER POIN
Page 478 and 479: .set iCu imsk,lO *aO • set icu -c
Page 480 and 481: holdloop: nop # br hold loop # # #*
Page 482 and 483: # msint: save [rO,rl,r2,r3] # movd
Page 484 and 485: #3/30/B7••••• D2APPS.ASM
Page 486 and 487: # #*************************** 1655
Page 488 and 489: -----------------------------------
Page 490 and 491: A Comparison of the I NS8250, NS 16
Page 492 and 493: -----------------------------------
Page 494 and 495: cessed (see Figure 4), The output o
Page 496 and 497: AC Electrical Characteristics T A =
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Page 500 and 501: 1.0 Absolute Maximum Ratings 2.0 Op
Page 502 and 503: 4.0 AC Electrical Characteristics (
Page 504 and 505: 5.0 Timing Waveforms (Continued) ii
Page 506 and 507: -----------------------------------
Page 508 and 509: 6.0 Connection Diagrams Dual-In-Lln
Page 510 and 511: 8.0 Block Diagram CPU INTERFACE INT
Page 512 and 513: 9.0 Registers (Continued) Bit three
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Section 5 Contents MM74HC942 300 Ba
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Absolute Maximum Ratings (Notes 1 &
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fj ::z:: ~ :::IE :::IE ~ ,---------
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Applications Information (Continued
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Absolute Maximum Ratings (Notes 1 &
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Description of Pin Functions Pin No
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Electrical Characteristics Unless o
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C'I 5 Pin Descriptions (Continued)
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IlAV22 RXIN LOCAL OSCILLATOR (L.O.)
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Functional Description (Continued)
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Functional Description (Continued)
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Absolute Maximum Ratings* If Milita
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Electrical Characteristics unless o
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Functional Description* (Continued)
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,...A212AT RECEIVE FILTER p--------
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TABLE III. Remote Digital Loopback
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. II) or- II) Z
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Section 6 Transmission Line Drivers
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~National ~ Semiconductor Transmiss
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~National ~ Semiconductor OS 1488 Q
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J?'A National ~ Semiconductor OS 14
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~National ~ Semiconductor DS26C31 C
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~National ~ Semiconductor DS26C32C
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~National ~ Semiconductor DS34C86 Q
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~National ~ Semiconductor PRELIMINA
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~National ~ Semiconductor DS1692/DS
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~National ~ Semiconductor DS75150 D
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~National ~ Semiconductor DS75176A/
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-----------------------------------
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~National ~ Semiconductor DS8922/22
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~National ~ Semiconductor DS96172/~
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~National ~ Semiconductor DS961771
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~National ~ Semiconductor DS9637 AI
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• I .----------------------------
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Section 7 Physical Dimensions
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~National ~ Semiconductor All dimen
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NS Package N16A N16A(REV E) 0.092 X
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t-------------I:..':::~"':I'-------
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0.11M-0.118 (2.642-2.9971 .. ••
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NOTES
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~National ~ Semiconductor Bookshelf
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RELIABILITY HANDBOOK-1986 Reliabili
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NATIONAL SEMICONDUCTOR CORPORATION
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NATIONAL SEMICONDUCTOR CORPORATION
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~ National ~ Semiconductor
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