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8.0 Remote Interface and Arbitration System (Continued) On the next clock the state machine will enter RSF and LCL will be deasserted. Once the state machine enters RSF, the Remote Processor is no longer using the buses and the BCP CPU will be granted the buses if LCL-BREQ is asserted. If a local bus request is made, a local bus grant will be given to the Timing Control Unit. If the preceding access was a read of IMEM, then HIB is switched and if the access was to the high byte of IMEM then the PC is incremented. If RAE·REM-RD is deasserted at this point, the next clock will bring RASM back to RSA where it will loop until another Remote Access is initiated. RSG is entered if RAE*REM-RD is still true. RASM will loop in RSG until RAE*REM-RD is no longer active at which time the state machine will return to RSA· In Figure 15, the BCP is executing the first of two Data Memory reads when REM-RD goes low. In response, XACK goes low, waiting the Remote Processor. At the end of the first instruction, although the BCP begins its second write by taking ALE high, the RASM now takes control of the bus and deasserts LCL at the end of T 1. A one T -state delay is built into this transfer to ensure that READ has been deasserted before the data bus is switched. The Timing Control Unit is now waited, inserting remote access wait states, T WR, as RASM takes over. The remote address is permitted one T -state to settle on the BCP address bus before READ goes low, XACK then returns high one T-state plus the programmed Data Memory wait state, TWd later, having satisfied the memory access time. READ returns high a half T -state later, ensuring sufficient hold time, followed by LCL being reasserted after an additional half T -state, transferring bus control back to the BCP. The Remote Processor responds to XACK by removing REM-RD, although by this time the BCP is well into its own memory read. Slow Buffered Write The timing for this mode is the same as the Buffered Read mode. The complete flow chart for the Slow Buffered Write mode is shown in Figure 29. Until a Remote Write is initiated (RAE*REM-WR true), the state machine (RASM) loops in state RSA. If [LOR) is set high, RASM will loop in RSA indefinitely. If the BCP CPU needs to access Data Memory at this time (and LOCK is high), it can still do so. A local access is requested by the Timing Control Unit asserting the Local Bus Request (LCL-BREQ) signal. A local bus grant will be given by RASM if the buses are not being used (as is the case in RSA). XACK is taken low as soon as RAE·REM-WR is true, regardless of an ongoing local access. RASM will move into RSs on the next clock after RAE·REM-WR is asserted and there is no local bus request and [LOR) = O. No further local bus requests will be granted until the remote access is complete and RASM returns to RSA. If the BCP CPU initiates a Data Memory access after RSA, the Timing Control Unit will be waited and the BCP CPU will remain in state TWr until completion of the remote access. On the next CPU-CLK, RASM enters RSe and LCL is asserted along with XACK. The wait state counters, ilw and iDW, are loaded in this state from (iW1-0) and [DW2-0], respectively, in [DCR}. The A and AD buses now go into TRI-STATE and the Access Phase begins. The state machine can move into one of several states, depending on the state of CMD and [MS1-0), on the next clock. XACK and LCL are still asserted in all the possible next states. If CMD is high, the access is to [RIC} and the next state will be RSD1. The path from AD to [RIC} opens in this state. The five other next states all have CMD low and depend on the Memory Select bits. If [MS1-0] is 10 or 11 the state machine will enter either RSD2 or RSD3 and the low or high bytes of the Program Counter, respectively, will be written. [MS1-0] equal to 00 designates a Data Memory access and moves RASM into RSD4. WRITE will be asserted in this state and A and AD continue to be atTRI-STATE. This allows the Remote Processor to drive the Data Memory address and data buses for the write. Since OM EM is subject to wait states, RSD4 is looped upon until all the programmed data memory wait states have been inserted. The last possible Memory Selection is Instruction Memory, [MS1-0] = 01. The two possible next states for IMEM depend on whether RASM is expecting the low byte or high byte. Instruction words are accessed low byte, then high byte and RASM powers up expecting the low Instruction byte. The internal flag that keeps track of the next expected Instruction byte is called the High Instruction Byte flag (HI B). If HIB is low, the next state is RSD5 and the low instruction byte is written into the holding register, ILAT. If HIB is "1", the high instruction byte is moved to 115-8 and the value in ILAT is moved to 17-0. At the same time, IWR rises, beginning the write to instruction memory. An IMEM access, like a DMEM access, is subject to wait states and these states will be looped on until all programmed Instruction Memory wait states have been inserted. <strong>Al</strong>l the RSD states eventually move to their corresponding RSE states on the clock after the wait state conditions, if any, are met. The RSE states are looped until RAE·REM WR is deasserted and WAIT is high. LCL is still asserted in this state, but XACK is taken back high to indicate that the remote access can be terminated. If XACK is connected to a Remote Processor wait pin, it can now terminate its write cycle. This state begins the Termination Phase. The action specified in the conditional box is only executed while RAE*REM-WR is asserted-a clock edge is not necessary. On the CPU-CLK after RAE·REM-WR is deasserted, RASM enters RSF. where LCL is asserted and the BCP A and AD buses are still in TRI-STATE. The next clock brings the state machine back to RSA state where it will loop until another Remote Access is initiated. If the access was to IMEM. then the last action of the remote access before returning to RSA is to switch HIB and increment the PC if the high byte was read. In Figure 30, the BCP is executing the first of two consecutive Slow Buffered Writes to Data Memory when REM-WR goes low. In response, XACK goes low. waiting the Remote Processor. At the end of the first instruction, although the BCP begins its second write by taking ALE high, RASM now takes control of the bus and deasserts LCL at the end of T 1. A one T -state delay is built into this transfer to ensure that WRITE has been deasserted before the data bus is switched. The Timing Control Unit is now waited, inserting remote access wait states. T W" as RASM takes over. ~ I I 2-157
DP8344A ~ 8l , RS A ......... , RS B I lOW = n[0W2-0] [C[ iDW-1-iDW TRI-STATE A. AD I RSIU [ TRI-STATE A. AD I RSD2 I TRI-STATE A.AD I , II'U-';)I"'t "."11 , RS£l CD b ::a CD 3 o -CD ~ -CD it () CD D) ~ Q. » ""I C" ::;: a 0" ~ 1 CD 3 g5 a '"
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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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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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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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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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Timing Characteristics (Continued)
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Functional Timing Waveforms (Contin
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Typical Applications (Continued) DA
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Absolute Maximum Ratings (Note 1) I
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MUX~ __________________ The BIPLAN
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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 (Cont
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5.0 Instruction Set Overview (Conti
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6.0 Instruction Set Reference (Cont
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Page 348 and 349: Decoding Bit Fields with the JRMK I
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Page 354 and 355: "Interrupts"-A Powerful Tool of the
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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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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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6.0 Pin Descriptions (Continued) In
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8.0 Registers (Continued) and 1, on
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8.0 Registers (Continued) 8.5 INTER
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4.0 Timing Waveforms (Continued) Re
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6.0 Pin Descriptions (Continued) Re
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8.0 Registers The system programmer
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8.0 Registers (Continued) 8.3 PROGR
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8.0 Registers (Continued) Table II
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9.0 Typical Applications (Continued
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Table of Contents 1.0 ABSOLUTE MAXI
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3.0 AC Electrical Characteristics T
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4.0 Timing Waveforms (Continued) Wr
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5.0 Block Diagram AO A, A2 CSD CSI
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6.0 Pin Descriptions (Continued) tr
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... .I>. '" Bit No. TABLE II. Summa
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8.0 Registers (Continued) 8.3 PROGR
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8.0 Registers (Continued) When the
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'" .j>. 01 PHil This shows the basi
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3. The Rx FIFO will hold 16 bytes r
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NS16550A E-J r-o ..... IRQ4 ICU CPU
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TITLE 550APP.ASM - NS16550A INITIAL
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3.0 Board to Board Communications w
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DIAPPS.ASM Flow Chart l> z • ~ CO
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» z I "" CD RDAI: DISABLE IRTS, SE
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COMPARE: SET UP COMPARE BUffER POIN
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.set iCu imsk,lO *aO • set icu -c
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holdloop: nop # br hold loop # # #*
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# msint: save [rO,rl,r2,r3] # movd
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#3/30/B7••••• D2APPS.ASM
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# #*************************** 1655
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A Comparison of the I NS8250, NS 16
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cessed (see Figure 4), The output o
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AC Electrical Characteristics T A =
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~National ~ Semiconductor \ J micro
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1.0 Absolute Maximum Ratings 2.0 Op
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4.0 AC Electrical Characteristics (
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5.0 Timing Waveforms (Continued) ii
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6.0 Connection Diagrams Dual-In-Lln
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8.0 Block Diagram CPU INTERFACE INT
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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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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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~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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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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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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