DE9411950U1 - Address selection circuit for PC cards - Google Patents

Address selection circuit for PC cards

Info

Publication number
DE9411950U1
DE9411950U1 DE9411950U DE9411950U DE9411950U1 DE 9411950 U1 DE9411950 U1 DE 9411950U1 DE 9411950 U DE9411950 U DE 9411950U DE 9411950 U DE9411950 U DE 9411950U DE 9411950 U1 DE9411950 U1 DE 9411950U1
Authority
DE
Germany
Prior art keywords
address
cards
address selection
register
selection circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
DE9411950U
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DE9411950U priority Critical patent/DE9411950U1/en
Publication of DE9411950U1 publication Critical patent/DE9411950U1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
    • G06F13/4204—Bus transfer protocol, e.g. handshake; Synchronisation on a parallel bus
    • G06F13/4221—Bus transfer protocol, e.g. handshake; Synchronisation on a parallel bus being an input/output bus, e.g. ISA bus, EISA bus, PCI bus, SCSI bus
    • G06F13/4226—Bus transfer protocol, e.g. handshake; Synchronisation on a parallel bus being an input/output bus, e.g. ISA bus, EISA bus, PCI bus, SCSI bus with asynchronous protocol

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Communication Control (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)

Description

BeschreibungDescription

In Personal Computern (PCs) nach Industriestandard können Slot-Karten zum Ausbau des PCs eingesteckt werden. Diese werden über bestimmte Speicher- oder I/O-Adressen angesprochen. Von großer Wichtigkeit dabei ist, daß nicht zwei Hardware-Einheiten auf den selben I/O-Adressen liegen bzw. den selben Speicherbereich nutzen.Slot cards can be inserted into industry-standard personal computers (PCs) to expand the PC. These are accessed via specific memory or I/O addresses. It is very important that no two hardware units are located on the same I/O addresses or use the same memory area.

In einem solchen Fall funktionieren in der Regel beide Einheiten nicht mehr einwandfrei.In such a case, both units usually no longer function properly.

Da freie I/O-Adressen in PCs Mangelware sind und bereits andere Hardware-Zusätze bestimmte Adressen benutzen können, muß beim Zustecken weiterer Karten u.U. die I/O-Adresse so angepaßt werden, daß keine Konflikte mehr auftreten.Since free I/O addresses are in short supply in PCs and other hardware add-ons can already use certain addresses, the I/O address may have to be adjusted when plugging in additional cards so that no more conflicts occur.

Dieses wurde bislang entweder mit sog. Jumpern oder DIL-Schaltern erreicht, mit denen man elektrisch bestimmte Adressen oder Speicherbereiche umschalten kann. Moderne PC-Karten haben anstatt entsprechender Schalter nichtflüchtige Speicher, z.B. EEPROMs, in denen die Konfigurationsinformationen mittels Software gespeichert werden können·This has previously been achieved either with so-called jumpers or DIL switches, which can be used to electrically switch certain addresses or memory areas. Instead of corresponding switches, modern PC cards have non-volatile memories, e.g. EEPROMs, in which the configuration information can be stored using software.

Nachteil dieser Möglichkeit sind die zusätzlichen Kosten die für den nichtflüchtigen Speicher entstehen.The disadvantage of this option is the additional costs incurred for the non-volatile memory.

Aufgabe der vorliegenden Erfindung war es nun eine Adresse per Software einstellen zu können, ohne einen nichtflüchtigen Speicher benutzen zu müssen.The aim of the present invention was to be able to set an address via software without having to use a non-volatile memory.

Diese Aufgabe wurde erfindugsgemäß dadurch gelöst, daß in der Hardware der PC-Karte zunächst eine I/O-Adresse fest eingestellt ist. Diese I/O-Adresse wird nur beschrieben und kann deshalb durchaus in Adreßkonflikt mit einer anderen I/O-Adresse liegen. Hierbei ist darauf zu achten, daß beim Schreiben auf die "Konfliktadresse" keine unerwünschten Nebeneffekte auftreten. Diese Festadresse und eine davon abgeleitete Adresse - z.B. die nächste oder die vorhergehende wird nun mit der eigentlich gewünschten Adresse beschrieben. Ferner wird noch eine Kennung übermittelt, damit nicht jeder Zugriff auf die I/O-Adresse zum Umschalten in den Software-Mode führt.This problem was solved according to the invention by initially setting an I/O address in the hardware of the PC card. This I/O address is only written to and can therefore be in address conflict with another I/O address. Care must be taken to ensure that no undesirable side effects occur when writing to the "conflict address". This fixed address and an address derived from it - e.g. the next or previous one - are now written to the actually desired address. An identifier is also transmitted so that not every access to the I/O address leads to switching to software mode.

Wurde die neue Adresse und die Kennung erfolgreich übermittelt, so schaltet die PC-Karte in den Software-Mode, d.h. die alte festeingestellte Adresse wird nicht mehr benutzt, vielmehr gehen jetzt sämtliche Zugriffe nur noch über die per Software eingestellte I/O-Adresse. Somit ist fortan auch jeder Adreßkonflikt beseitigt.If the new address and ID have been successfully transmitted, the PC card switches to software mode, i.e. the old fixed address is no longer used, but all access is now only via the I/O address set by the software. This means that any address conflict is eliminated from now on.

Die alte festeingestellte Adresse wird erst wieder benutzt, wenn durch einen Reset das Mode-Flip-Flop wieder in den Ausgangszustand zurückgesetzt wird.The old fixed address is only used again when the mode flip-flop is reset to its initial state.

Claims (1)

PatentansprüchePatent claims Adreß-Selektionsschaltung für PC-Karten dadurch gekennzeichnet,Address selection circuit for PC cards characterized by daß der Adreßdekoder der Karte zur Einstellung einer beliebigen I/O-Adresse oder eines Speicherbereichs durch ein Register gesteuert wird und daß dieses Adreß-Selektionsregister ein bei Speisespannungsausfall flüchtiger Speicher ist und daß beim Schreiben der einzustellenden I/O-Adresse in dieses Adreß-Selektionsregister hardwaremäßig selektierbare I/O-Adressen zur Ansteuerung des Registers benutzt werden. Ferner dadurch gekennzeichnet, daß eine Benutzung der eingeschriebenen I/O-Adresse nur dann erfolgt, wenn zusätzlich zu der Adresse eine bestimmte Kennung übertragen^wird.._ _... - .._.. „ .. . _that the address decoder of the card is controlled by a register for setting any I/O address or memory area and that this address selection register is a memory that is volatile in the event of a power failure and that when writing the I/O address to be set into this address selection register, hardware-selectable I/O addresses are used to control the register. Furthermore characterized in that the written I/O address is only used if a specific identifier is transmitted in addition to the address.._ _... - .._.. „ .. . _ Schaltung nach Anspruch 1. dadurch gekennzeichnet,Circuit according to claim 1, characterized in daß der Inhalt des Adreß-Selektionsregisters nach Einschreibung der neuen I/O-Adresse nicht mehr durch weitere Zugriffe verändert werden kann.that the content of the address selection register can no longer be changed by further accesses after the new I/O address has been written.
DE9411950U 1994-07-26 1994-07-26 Address selection circuit for PC cards Expired - Lifetime DE9411950U1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE9411950U DE9411950U1 (en) 1994-07-26 1994-07-26 Address selection circuit for PC cards

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE9411950U DE9411950U1 (en) 1994-07-26 1994-07-26 Address selection circuit for PC cards

Publications (1)

Publication Number Publication Date
DE9411950U1 true DE9411950U1 (en) 1995-01-05

Family

ID=6911532

Family Applications (1)

Application Number Title Priority Date Filing Date
DE9411950U Expired - Lifetime DE9411950U1 (en) 1994-07-26 1994-07-26 Address selection circuit for PC cards

Country Status (1)

Country Link
DE (1) DE9411950U1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19522335A1 (en) * 1995-06-06 1997-01-02 Lg Semicon Co Ltd Setting input and output base addresses for jump free configurations

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19522335A1 (en) * 1995-06-06 1997-01-02 Lg Semicon Co Ltd Setting input and output base addresses for jump free configurations

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