Intel 537EX manual Receiver Buffer Register RBR, Divisor Latch Registers DLM and DLL

Page 101

Parallel Host Interface 16C450/16C550A UART

9.2.10Receiver Buffer Register (RBR)

Figure 23. Receiver Buffer Register (RBR)

Register 0

(DLAB = 0)

RBR

The RBR (Receiver Buffer register) is a read-only register used for receiving data and AT command responses from the modem.

9.2.11Divisor Latch Registers (DLM and DLL)

Figure 24. Divisor Latch Registers (DLM and DLL)

Register 1

(DLAB = 1)

Register 0

(DLAB = 1)

DLM (MS)

DLL (LS)

The LS divisor latch (least-significant byte) and MS divisor latch (most-significant byte) are two read/write registers used to set the modem data rate. The data rate is selected by loading each divisor latch with the appropriate hex value. The programmable data rates are provided in the following table. For example, to use a data rate of 2400 bps, load a $00h into the DLM and a $30h into the DLL.

Table 29. Programmable Data Rates

Data Rate

Divisor Number

Divisor Latch (Hex)

 

 

 

 

 

(Decimal)

MS

LS

 

 

 

 

300

384

01

80

 

 

 

 

1200

96

00

60

 

 

 

 

2400

48

00

30

 

 

 

 

4800

24

00

18

 

 

 

 

7200

16

00

10

 

 

 

 

9600

12

00

0C

 

 

 

 

19200

6

00

06

 

 

 

 

38400

3

00

03

 

 

 

 

57600

2

00

02

 

 

 

 

536EX Chipset Developer’s Manual

101

Intel Confidential

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Contents Developer’s Manual 537EX ChipsetIntel Confidential Contents Figures Tables 001 Initial release Revision HistoryDate Revision Description Controllerless Modem Driver Overview IntroductionWindows 95 and Windows Tapi V.90/V.92 and V.34 Data ModesUnimodem Intelsdb.VXDModem Connection Overview DTE-to-DCE Data Rates for Each Mode AT Commands OverviewDCE-to-DCE Data Rates for Each Mode DCE-to-ISP Data Rates for V.90 ModeDelayed Call Sending CommandsDTE-Modem Data Rate Response Codes Numeric TextAT Escape Sequences Command FunctionDial Modifier Dialing digitsCommand Function Default Range Reported By &Vn Data Mode Command SummaryIntel Confidential Intel Confidential Intel Confidential +ESA +EB+ESR +ETBM44/V.42/V.42 bis MNP Command Summary Processes flow control characters and passes to local Fax Class 1 Command Summary Fax Identity Command SummaryResponse Hex Code Function IS-101 Voice Command SummaryVoice DTE→DCE Character Pairs Voice DTE←DCE Character Pairs Voice DTE →DCE Character PairsDEL ESCDial Modifiers Register Function Default Range Units Reported by &VnRegister Summary AsciiRegister Function Default Range Units Modem Setup Host Modem Response Command Using AT Commands to Access the S-Registers Sn?, Sn=x, ?Modem Responses and Command Echo En, Vn, Xn, Wn, Qn DTE Disable EnableData Reporting Wn Mapping Resets and then configures the modem to Nvram user profile Product Identification Information AT Commands Product InformationEstablishing a Modem Connection A, D, DS = n, S0 Modem-to-Modem Connection Data Rates Online Command Mode Escape Codes, OnHanging Up Hn, S10, Zn, &D2 Intel Confidential Modem-on-Hold Incoming Voice Call in Data Mode Modem-on-Hold Initiating a Voice Call in Data Mode Intel Confidential Carrier Description Supported Modulation TypesLocal Analog Loopback AT&T1 Diagnostic Testing S18, &TnLocal Modem or Test Modem Local Analog Loopback With Self-Test AT&T8Licensing Requirements for Hayes Escape Sequence AT Escape SequencesTime-Independent Escape Sequence Example Hayes* Escape Sequence Data Mode Command DescriptionsCommand Default Description Host in either online or off-line command mode Previously stored in the Nvram with the AT&Zn=x commandEcho disabled Echo enabledSn=x ATI2DTE Modem dials a telephone number touch tone dialing CommandNumeric or verbose form Numeric formSubsequent commands to be ignored DisconnectingResets the modem and recalls user profile DCD or Rlsd signalActive Profile AT&V0Stored Profile Telephone NumbersCommand to see the stored telephone number S-register configurations into the Nvram user profile ‘n’Select profile = 0-9 a B C D # * T P R W @Indication Definition Command Default+EB Nrzi encoding and decoding disabled CRC generation and checking disabledSecondary channel operation, and vice versa 12/V.34+ETBM +ESR+GSN +GMR+IFC +ILRR=m+MA? will display a list of enabled alternative modulations +MS command description= carrier,carrier,…carrier If +MS = ,0,, no alternative modulations will be availableBELL103 Carrier DescriptionBELL212 +MS=m See ‘m’+PMHF +PHSW=Value Description +PMHREnable Short Phase 1 and Short Phase Conjunction with the +PSS commandEnable Short Phase Disable short Phase 1 and Short PhaseOperating Modes Mode Features+ES Settings Answer Modem 44/V.42/V.42 bis and MNP Data Modem Command DescriptionsResulting +ES Connection Types +ES=1, 0 +ES=4, 4 +ES=3, 0 +ES=3, 2\Bn \Kn Direction +DR=m+DS=m Max string+EFCS=m 3768Decimal value and the format is as follows Display messages when +ER =+ER=m +ER LapmControl during non-error control operation Setting is ignored if origrqst=6Non-error control operation +ES=mFax Class 1 Commands Fax Identity CommandsFax Identity Command Descriptions +FMFR?/+FMIValue Modulation Speed bps Mod Selection TableClass 1 DTE-Generated Hdlc Frame Information AT+FTH=mod 30 Hdlc Frame Format+FCLASS Fax Mode Command Descriptions+FCLASS? +FRS=m +FRH=m+FTH=m IS-101 Voice Mode AT Commands Relay Control Voice Mode Command DescriptionsDtmf Detection Reporting +FLO=m +VDR=m See ‘m’ Enable report FunctionCaller ID report Command Reserved Distinctive ringing All Defaults = ‘C’, BB860980, BFE63883, BB863EE0Event Description +VEM=m See ‘m’HEX Digit Location EIGHT-DIGIT HEX Code B B 8 6 3 E EEX Value BIT Value Event +VIP Local telephone, or speaker128 Nominal transmit level +VLS=m Preassigned Voice I/O LabelsLabel Primitive Code Description Voice I/O Primitive CodesRelay/Playback Control +VSD=m See ‘m’ +VRX141 AD3 3-bit Adaptive differential pulse code modulation +VSM=? command to obtain supported sampling rates+VSM=m Range 4800, 7200, 8000, and 11025 samples/secondSerial CmlHard Disk Compression100 Default value 1 second Factory default is ‘0’100 Range 5-255 units of 0.01 seconds+VTS=m None Dual tones may be sent using the following formatSpecified by +VTD=m This sends a 500 ms period of silenceCommand Default Description Register Command Descriptions S10 S16 Range Seconds Default 0 secondsEscape sequences S22 118 S21S25 S30Modem or when a ring signal is detected Modem exits sleep mode whenever the host reads or writes toSleep mode is disabled by setting S33 to ‘0’ Inactive state whenTag Description Caller ID Tags for Formatted ReportingRing Uart Emulation in Intelsdb.VxD Uart Emulation in the Controllerless ModemRBR UartTHR Parallel Host Interface Uart Register Bit Assignments Modem Status Register MSR Uart Register DefinitionsScratch Register SCR OE Overrun Error-Not supported Bit Framing errorLine Status Register LSR StackProcedure is as follows IER Interrupt Enable registerModem Control Register MCR Line Control Register LCRBit Fifo Control Register FCRID1 ID0 Interrupt Identity Register IIRInterrupt Control Functions ID bit 2 for Fifo mode Interrupt Enable Register IERTransmitter Holding Register THR Dlab =Divisor Latch Registers DLM and DLL Receiver Buffer Register RBRProgrammable Data Rates Data Rate Divisor Number Divisor Latch HexFifo Polled Mode Operation Fifo Interrupt Mode Operation16C550A Uart Fifo Operation 102536EX Chipset Developer’s Manual 103

537EX specifications

The Intel 537EX is a powerful and innovative embedded processor designed for a range of applications, particularly in the fields of industrial automation, telecommunications, and transport management systems. This processor is a member of Intel's embedded product line, tailored specifically to meet the demands of systems that require high reliability and long lifecycle support.

One of the main features of the Intel 537EX is its multi-core architecture, which enables efficient parallel processing capabilities. This allows for the execution of multiple tasks simultaneously, significantly improving overall system performance. The processor also incorporates Intel’s advanced power management technology, which ensures that the device consumes energy efficiently, enhances thermal performance, and prolongs the lifespan of the system.

The Intel 537EX supports a range of connectivity options, including high-speed Ethernet and Serial ATA interfaces. This ensures that it can easily integrate into existing systems, seamlessly supporting applications that require robust data transfer capabilities. Additionally, the processor is equipped with multiple I/O ports, facilitating the connection of various peripherals and sensors, which is crucial in industrial applications.

One of the standout technologies within the Intel 537EX is its support for hardware virtualization. This feature allows for the creation of multiple virtual environments within a single physical structure, optimizing resource utilization and enhancing system flexibility. Additionally, Intel’s integrated security technologies provide a significant layer of protection against potential threats, ensuring that embedded systems remain secure.

Another characteristic of the Intel 537EX is its extensive software support, which includes compatibility with various operating systems and development environments. This versatility makes it an attractive choice for developers looking to build or upgrade their embedded systems. With access to Intel's comprehensive software tools, developers can quickly optimize applications to take full advantage of the processor's capabilities.

The Intel 537EX also boasts excellent thermal performance, allowing it to operate efficiently in harsh environments. This is crucial for embedded applications in industrial settings where temperature fluctuations are common. Overall, the Intel 537EX is engineered to deliver high-performance processing power, superior connectivity, and enhanced security, solidifying its position as a reliable choice for demanding embedded applications.
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