Difference between revisions of "LH-DH/11 Local/Distant Host Controller"

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(→‎0767600: Control & Status In Register (CSRI): add bits)
(→‎0767610: Control & Status Out Register (CSRO): add bits)
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===0767610: Control & Status Out Register (CSRO)===
 
===0767610: Control & Status Out Register (CSRO)===
 
{{16bit-header}}
 
{{16bit-header}}
−
| ERR || NXM || WC0 || colspan=3 | Unused || TMRE || ODBE || RDY || IE || colspan=2 | XBA16-17 || BBM || ELB || IRST || GO
+
| ERR || NXM || WC0 || colspan=3 | Unused || TMRE || ODBE || RDY || IE || colspan=2 | XBA16-17 || BBM || ELB || ORST || GO
 
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 +
 +
* ERR - Error Flag
 +
* NXM - Non-Existent Memory
 +
* WC0 - Word Count = 0
 +
* TMRE - Transmit Master Ready Error
 +
* ODBE - Output Data Buffer Empty
 +
* RDY - Device Ready
 +
* IE - Interrupt Enable
 +
* BBM - Bus-Back Mode
 +
* ELB - Enable Last Bit
 +
* ORST - Output Interface Reset
  
 
===0767612: Data Buffer Out Register (DBRO)===
 
===0767612: Data Buffer Out Register (DBRO)===

Revision as of 05:14, 30 October 2021

The LH-DH/11 Local/Distant Host Controller is a DMA UNIBUS IMP interface produced by ACC to allow a UNIBUS machine to connect to an ARPANET IMP.

It consists of a 10-1/2" rack mounting box holding a pair of wire-wraped boards (one for packet input, and one for output), holding a number of SSI TTL integrated circuits; there is also an internal power supply. Level converters allow use as either a Local Host or Distant Host interface; BC11A cables connect it to the rest of the system.

Registers

Register Abbreviation Address
Control & Status In Register CSRI 0767600
Data Buffer In Register DBRI 0767602
Current Word Address In Register CWAI 0767604
Word Count In Register WCI 0767606
Control & Status Out Register CSRO 0767610
Data Buffer Out Register DBRO 0767612
Current Word Address Out Register CWAO 0767614
Word Count Out Register WCO 0767616

0767600: Control & Status In Register (CSRI)

ERR NXM EOM Unused HR INR RMRE IDBF RDY IE XBA16-17 SENB HRC IRST GO
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
  • ERR - Error Flag
  • NXM - Non-Existent Memory
  • EOM - End of Message
  • HR - Host Ready
  • INR - IMP Not Ready
  • RMRE - Receive Master Ready Error
  • IDBF - Input Data Buffer Full
  • RDY - Device Ready
  • IE - Interrupt Enable
  • SENB - Store Enable
  • HRC - Host Relay Control
  • IRST - Input Interface Reset

0767602: Data Buffer In Register (DBRI)

Data15 <---> Data00
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

0767604: Current Word Address In Register (CWAI)

WA15 <---> WA00
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

0767606: Word Count In Register (WCI)

WC15 <---> WC00
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

0767610: Control & Status Out Register (CSRO)

ERR NXM WC0 Unused TMRE ODBE RDY IE XBA16-17 BBM ELB ORST GO
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
  • ERR - Error Flag
  • NXM - Non-Existent Memory
  • WC0 - Word Count = 0
  • TMRE - Transmit Master Ready Error
  • ODBE - Output Data Buffer Empty
  • RDY - Device Ready
  • IE - Interrupt Enable
  • BBM - Bus-Back Mode
  • ELB - Enable Last Bit
  • ORST - Output Interface Reset

0767612: Data Buffer Out Register (DBRO)

Data15 <---> Data00
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

0767614: Current Word Address Out Register (CWAO)

WA15 <---> WA00
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

0767616: Word Count Out Register (WCO)

WC15 <---> WC00
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

External links

Retrieved from "https://gunkies.org/w/index.php?title=LH-DH/11_Local/Distant_Host_Controller&oldid=24537"