Difference between revisions of "DS11 Multiple Line Synchronous Interface"

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The '''DS11 Multiple Line Synchronous Interface''' is an early [[synchronous serial line]] [[peripheral|interface]] for the [[UNIBUS]]; it can handle up to 16 lines.
+
The '''DS11 Multiple Line Synchronous Interface''' was an early [[synchronous serial line]] [[peripheral|interface]] for the [[UNIBUS]]; it could handle up to 16 lines. It used [[programmed I/O]] (with separate receive and transmit [[interrupt]]s) to transfer data; it could operate in either [[half-duplex]] or [[full-duplex]] mode.  
  
−
It consists of a master line scanner, and up to four adapters, each of which can handle up to four lines. Physically, it is a large [[backplane]], mounted in a 19" cabinet such as an [[H960 rack|H950]], along with an [[DEC indicator panel]]; each line has a separate [[DEC card form factor|quad]] M7110 Line Control Module.
+
Character lengths of 6, 8 and 12 bits were supported, and could be configured by software. It provided an [[EIA RS-232 serial line interface|EIA RS-232]] interface to Bell 200 series [[modem]]s (such as the model 201, and equivalents), and also connect to Bell 300 series modems, such as the model 303.
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Like the earlier [[DP11-A synchronous serial line interface|DP11-A]], it used [[programmed I/O]] (with separate receive and transmit [[interrupt]]s) to transfer data; it was double-[[buffer]]ed for both input and output.
+
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 +
optionally a [[20mA current loop serial line interface|current loop]] interface (to Bell 300 series modems, such as the model 303, and equivalents). [[Baud rate]]s of up to 9.6K bits/second were supported by the EIA interface, and up to 100K bits/second by the current loop interface.
  
−
It provided an [[EIA RS-232 serial line interface|EIA RS-232]] interface (to Bell 200 series [[modem]]s, such as the model 201, and equivalents), and optionally a [[20mA current loop serial line interface|current loop]] interface (to Bell 300 series modems, such as the model 303, and equivalents). [[Baud rate]]s of up to 9.6K bits/second were supported by the EIA interface, and up to 100K bits/second by the current loop interface.
+
The [[character]] length (5, 6, 7 or 8 [[bit]]s), and the [[sync character]], were selectable; [[parity]] (even or odd) was optionally supported for error detection. All configuration, as well as all the modem control leads, could be set under program control. A [[jumper]] allows configuration of whether one or two contiguous sync characters is needed for synchronization.
  
−
The [[character]] length (5, 6, 7 or 8 [[bit]]s), and the [[sync character]], were selectable; [[parity]] (even or odd) was optionally supported for error detection. It could operate in either [[half-duplex]] or [[full-duplex]] mode. All configuration, as well as all the modem control leads, could be set under program control. A [[jumper]] allows configuration of whether one or two contiguous sync characters is needed for synchronization.
+
It apparently supported idling (sending the sync character); the line could also be set to a [[serial line|mark]] condition when not transmitting characters.
−
<!-- It apparently supported idling (sending the sync character); the line could also be set to a [[serial line|mark]] condition when not transmitting characters. The DU11 could also be set to discard additional incoming sync characters. --
 
−
 
 
−
It was a [[DEC card form factor|quad-width]] card, the '''M7822'''; it plugged into an [[Small Peripheral Controller|SPC]] slot. A [[Berg connector|Berg header]] on the card provided the 'native' EIA interface; alternatively, when the M7822 card was plugged into a [[DD11-B backplane]], a two single-card [[DF11 Communications Line Adapter]] set could be used to connect to current loop modems which were not supported 'natively' by the M78222 (such as the Bell 303). Optionally, the DFC11-A (installed instead of a DF11) allowed use of an internal [[clock]] (when two interfaces were connected directly, without modems).
 
 
-->
 
-->
 
==Registers==
 
==Registers==
Line 25: Line 22:
 
|-
 
|-
 
|Transmitter Data Buffer Register          || TxDBUF || 775xx6
 
|Transmitter Data Buffer Register          || TxDBUF || 775xx6
 +
|-
 +
|Interface Status Register                || ISTR || 775600
 
|}
 
|}
  
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: ...
 
: ...
 
* Line 15: 775570-775576
 
* Line 15: 775570-775576
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+
 
−
===16xx10: Receiver Status Register (RxCSR)===
+
In the register contents (below), bits which are read/write or unused are shown in normal font, those which are read-only are in ''italics'', and write-only in '''bold'''.
 +
 
 +
===175xx0: Receiver Status Register (RxCSR)===
  
 
{{16bit-header}}
 
{{16bit-header}}
−
| DSC || RING || CTS || CARR || RACT || SECRCV || DSR || STRSYN || RDN || RIE || DSIE || SRCHSYN || SECXMT || RTS || DTR || Unused
+
| RING || BITOVR || CHAROVR || CARLST || colspan=2 | SYNCST || ''CARDET'' || DTR || ''DONE'' || ''DSR'' || colspan=2 | CHARLEN || colspan=2 | DNIA || RNGENB || RCVENB
 
{{16bitoctal-bitout}}
 
{{16bitoctal-bitout}}
  
−
* DSC - Data Set Change; set for any change on Ring, Carrier, Data Set Ready, Clear to Send or Secondary Received Data lines
+
* BITOVR - Bit Overrun
−
* RING - Ring Indicator
+
* CHAROVR - Character Overrun
−
* CTS - Clear to Send
+
* CARLST - Carrier Lost
−
* CARR - Carrier
+
* SYNCST - Sync State
−
* RACT - Receiver Active; setting dependent on the internal/external synchronization mode
+
* CARDET - Carrier Detected
−
* SECRCV - Secondary Received Data
+
* DTR - Data Terminal Ready
 
* DSR - Data Set Ready
 
* DSR - Data Set Ready
−
* STRSYN - Strip Sync; sync characters are discarded
+
* CHARLEN - Character Length
−
* RDN - Receive Done Flag; set  when the receive buffer is filled with an assembled character
+
* DNIA - Done Interrupt Assignment
−
* RIE - Receiver Interrupt Enable; allows an input interrupt when Receive Done is set
+
* RNGENB - Ring Enable
−
* DSIE - Data Set Interrupt Enable; allows an input interrupt when DSC is set
+
* RCVENB - Receiver Enable
−
* SRCHSYN - Search Synchronization; when set, the receiver looks for synch character(s)
 
−
* SECXMT - Secondary Transmit Data
 
−
* RTS - Request to Send
 
−
* DTR - Data Terminal Ready
 
  
−
===16xx12 (read): Receiver Data Buffer Register (RxDBUF)===
+
===175xx2 (read): Receiver Data Buffer Register (RxDBUF)===
  
 
{{16bit-header}}
 
{{16bit-header}}
−
| ERR || OVR || Unused || PARERR || colspan=4 | Unused || colspan=8 | RDBUF
+
| colspan=4 | Unused || colspan=12 | RDBUF
 
{{16bitoctal-bitout}}
 
{{16bitoctal-bitout}}
  
−
* ERR - Error
 
−
* OVR - Overrun
 
−
* PARERR - Parity Error
 
 
* RDBUF - Receiver Data Buffer
 
* RDBUF - Receiver Data Buffer
  
−
===16xx12 (write): Parameter Control Register (PARCSR)===
+
===175xx4: Transmitter Status Register (TxCSR)===
 +
 
 +
{{16bit-header}}
 +
| Unused || BITOVR || CHAROVR || CTSLST || colspan=2 | Unused || ''CTS'' || DTR || DONE || ''DSR'' || colspan=2 | CHARLEN || colspan=2 | DNIA || IDLE || RTS
 +
{{16bitoctal-bitout}}
 +
 
 +
* BITOVR - Bit Overrun
 +
* CHAROVR - Character Overrun
 +
* CTSLST - Clear to Send Lost
 +
* CTS - Clear to Send
 +
* DTR - Data Terminal Ready
 +
* DSR - Data Set Ready
 +
* CHARLEN - Character Length
 +
* DNIA - Done Interrupt Assignment
 +
* RTS - Request to Send
 +
 
 +
===175xx6: Transmitter Data Buffer Register (TxDBUF)===
  
 
{{16bit-header}}
 
{{16bit-header}}
−
| colspan=2 | Unused || colspan=2 | MODE || colspan=2 | LEN || PAR EN || EVEN PAR ||  colspan=8 | SYNC
+
| colspan=4 | Unused || colspan=12 | TDBUF
 
{{16bitoctal-bitout}}
 
{{16bitoctal-bitout}}
  
−
* MODE - Synchronous Mode Select (10=External, 11=Internal)
+
* TDBUF - Transmitter Data Buffer
−
* LEN - Length (00=5, 01=6, 10=7, 11=8)
 
−
* PAR EN - Parity Enable
 
−
* EVEN PAR - Even Parity selected
 
−
* SYNC - Sync Character
 
  
−
===16xx14: Transmitter Status Register (TxCSR)===
+
===175600: Interface Status Register (ISTR)===
  
 
{{16bit-header}}
 
{{16bit-header}}
−
| DNA || MD || MCLK || colspan=2 | MMS || MBW || Unused || MR || TDN || TIE || DNAIE || SEND || HDFD || colspan=2 | Unused || BRK
+
| ''A3IN'' || ''A2IN'' || ''A1IN'' || colspan=3 | Unused || colspan=2 | VAHBITS || DIAGM || PRCLK || Unused || '''CLRBC''' || colspan=4 | ''DIAGBC''
 
{{16bitoctal-bitout}}
 
{{16bitoctal-bitout}}
  
−
* DNA - Data Not Available
+
* A3IN - Adapter 3 In
−
* MD - Maintenance Data
+
* A2IN - Adapter 2 In
−
* MCLK - Maintenance Clock
+
* A1IN - Adapter 1 In
−
* MMS - Maintenance Mode Select (01=Internal, 10=External, 11=Internal systems)
+
* VAHBITS - Vector Address High Bits
−
* MBW - Maintenance Bit Window
+
* DIAGM - Diagnostic Mode
−
* MR - Master Reset
+
* PRCLK - Program Clock
−
* TDN - Transmitter Done; set when the Transmitter Data Buffer is ready for the next character
+
* CLRBC - Clear Bit Counter
−
* TIE - Transmitter Interrupt Enable; allows a transmit interrupt when Transmit Done is set
+
* DIAGBC - Diagnostic Bit Counter
−
* DNAIE - Data Not Available Interrupt Enable
 
−
* SEND - Send; enables the transmitter logic
 
−
* HDFD - Half-Duplex/Full-Duplex
 
−
* BRK - Send [[Asynchronous serial line|Break]]
 
  
−
===16xx16: Transmitter Data Buffer Register (TxDBUF)===
+
==Interrupt vectors==
  
 +
The DS11 uses an [[array]] of [[interrupt vector]]s, as follows:
 
{{16bit-header}}
 
{{16bit-header}}
−
| colspan=8 | Unused || colspan=8 | TDBUF
+
| colspan=6 | Unused || colspan=2 | VAHBITS || colspan=4 | LINE || TINT || STINT || colspan=2 | 0
 
{{16bitoctal-bitout}}
 
{{16bitoctal-bitout}}
  
−
* TDBUF - Transmitter Data Buffer -->
+
* VAHBITS - Vector Address High Bits
 +
* LINE - Line Number
 +
* TINT - Transmitter Interrupt
 +
* STINT - Status Interrupt
 +
 
 +
==Implementation==
 +
 
 +
The DS11 consisted of a master line scanner, and up to four adapters, each of which could handle up to four lines; each line had a separate [[DEC card form factor|quad]] M7110 Line Control Module. Physically, it is a large quad-height [[backplane]], mounted in a 19" cabinet such as an [[H960 rack|H950]], along with the DS11's [[DEC indicator panel]].
 +
 
 +
The DS11, like some other early UNIBUS peripherals, was made of many small [[FLIP CHIP]]s. The inventory of the card types in the DS11 is:
 +
 
 +
* G830 5V, 10A Regulator from 8V
 +
* M002 Resistor network
 +
* M126 6 x AND-NOR Gates
 +
* M128 4,4 AND-NOR Gates
 +
* M139 3 x 8-Input NAND Gates
 +
* M143 10 x 2-Input NAND Gates
 +
* M145 7 x 3-Input NAND Gates
 +
* M147 5 x 4-Input, 1 x 2-Input NAND Gates
 +
* M152 Dual Non-inverting Binary to Octal with Enable
 +
* M165 Memory buffer, Inverting and Non-inverting Output
 +
* M171 2-2-2-3 AND-NOR
 +
* M173 10 x 2-input AND gates
 +
* M174 4 En x 9 out mixer
 +
* M175 7 x 3-input AND gates
 +
* M177 5 x 4-Input AND Gates
 +
* M178 8 En x 6 out mixer
 +
* M181 Non-inverting 2-2-2-3 AND-NOR
 +
* M211 6-Bit Up/Down Counter
 +
* M241 6 x D Flip-flops with common clock
 +
* M243 8 x D Flip-flops with 2 common clocks
 +
* M246 5 x D Flip-Flops
 +
* M253 16 Word, 12-bit Memory
 +
* M307 Integrating One Shot
 +
* M321 Tapped Delay Line
 +
* M362 Delay, 25 to 50 ns
 +
* M401 Variable Clock
 +
* M603 Pulse Amplifiers
 +
* M612 6 Power Gates
 +
* M783 UNIBUS Drivers
 +
* M784 UNIBUS Receiver
 +
* M785 UNIBUS Transceiver
 +
* M931 15 Terminators
 +
* M969 24 Level Terminators
 +
* M511 UNIBUS Receivers - sources differ as to whether or not this is used
 +
* W990 Connectors
 +
* [[M105 Address Selector]] - used to set its bus address
 +
* [[M782 Interrupt Control|M7820 Interrupt Control]]
 +
* M7110 Line Control Module - one per line
 +
 
 +
The number of each type used is currently unknown; likewise the locations in the backplane (except the M7110's)
  
 
{{semi-stub}}
 
{{semi-stub}}
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* [http://bitsavers.org/www.computer.museum.uq.edu.au/pdf/DEC-10-XSRMA-A-D%20DECsystem10%20System%20Reference%20Manual.pdf DECsystem-10 System Reference Manual] - documents the DS11 registers in Appendix C (pp. 370-371 of the PDF)
 
* [http://bitsavers.org/www.computer.museum.uq.edu.au/pdf/DEC-10-XSRMA-A-D%20DECsystem10%20System%20Reference%20Manual.pdf DECsystem-10 System Reference Manual] - documents the DS11 registers in Appendix C (pp. 370-371 of the PDF)
−
* [https://archive.org/35/items/bitsavers_decmodules_110248/M7110_text.pdf M7110]
+
* [http://www.bitsavers.org/pdf/dec/modules/mSeries/M7110.pdf M7110]
 +
<!-- * [http://www.bitsavers.org/pdf/dec/modules/mSeries/M511.pdf M511] -->
  
−
[[Category: UNIBUS Serial Interfaces]]
+
[[Category: UNIBUS Synchronous Serial Interfaces]]
−
[[Category: DEC Synchronous Serial Interfaces]]
 

Latest revision as of 18:38, 5 January 2024

The DS11 Multiple Line Synchronous Interface was an early synchronous serial line interface for the UNIBUS; it could handle up to 16 lines. It used programmed I/O (with separate receive and transmit interrupts) to transfer data; it could operate in either half-duplex or full-duplex mode.

Character lengths of 6, 8 and 12 bits were supported, and could be configured by software. It provided an EIA RS-232 interface to Bell 200 series modems (such as the model 201, and equivalents), and also connect to Bell 300 series modems, such as the model 303.

Registers

Register Abbreviation Address
Receiver Status Register RxCSR 775xx0
Receiver Data Buffer Register RxDBUF 775xx2
Transmitter Status Register TxCSR 775xx4
Transmitter Data Buffer Register TxDBUF 775xx6
Interface Status Register ISTR 775600

Line addresses:

  • Line 0: 775400-775406
...
  • Line 15: 775570-775576

In the register contents (below), bits which are read/write or unused are shown in normal font, those which are read-only are in italics, and write-only in bold.

175xx0: Receiver Status Register (RxCSR)

RING BITOVR CHAROVR CARLST SYNCST CARDET DTR DONE DSR CHARLEN DNIA RNGENB RCVENB
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
  • BITOVR - Bit Overrun
  • CHAROVR - Character Overrun
  • CARLST - Carrier Lost
  • SYNCST - Sync State
  • CARDET - Carrier Detected
  • DTR - Data Terminal Ready
  • DSR - Data Set Ready
  • CHARLEN - Character Length
  • DNIA - Done Interrupt Assignment
  • RNGENB - Ring Enable
  • RCVENB - Receiver Enable

175xx2 (read): Receiver Data Buffer Register (RxDBUF)

Unused RDBUF
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
  • RDBUF - Receiver Data Buffer

175xx4: Transmitter Status Register (TxCSR)

Unused BITOVR CHAROVR CTSLST Unused CTS DTR DONE DSR CHARLEN DNIA IDLE RTS
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
  • BITOVR - Bit Overrun
  • CHAROVR - Character Overrun
  • CTSLST - Clear to Send Lost
  • CTS - Clear to Send
  • DTR - Data Terminal Ready
  • DSR - Data Set Ready
  • CHARLEN - Character Length
  • DNIA - Done Interrupt Assignment
  • RTS - Request to Send

175xx6: Transmitter Data Buffer Register (TxDBUF)

Unused TDBUF
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
  • TDBUF - Transmitter Data Buffer

175600: Interface Status Register (ISTR)

A3IN A2IN A1IN Unused VAHBITS DIAGM PRCLK Unused CLRBC DIAGBC
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
  • A3IN - Adapter 3 In
  • A2IN - Adapter 2 In
  • A1IN - Adapter 1 In
  • VAHBITS - Vector Address High Bits
  • DIAGM - Diagnostic Mode
  • PRCLK - Program Clock
  • CLRBC - Clear Bit Counter
  • DIAGBC - Diagnostic Bit Counter

Interrupt vectors

The DS11 uses an array of interrupt vectors, as follows:

Unused VAHBITS LINE TINT STINT 0
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
  • VAHBITS - Vector Address High Bits
  • LINE - Line Number
  • TINT - Transmitter Interrupt
  • STINT - Status Interrupt

Implementation

The DS11 consisted of a master line scanner, and up to four adapters, each of which could handle up to four lines; each line had a separate quad M7110 Line Control Module. Physically, it is a large quad-height backplane, mounted in a 19" cabinet such as an H950, along with the DS11's DEC indicator panel.

The DS11, like some other early UNIBUS peripherals, was made of many small FLIP CHIPs. The inventory of the card types in the DS11 is:

  • G830 5V, 10A Regulator from 8V
  • M002 Resistor network
  • M126 6 x AND-NOR Gates
  • M128 4,4 AND-NOR Gates
  • M139 3 x 8-Input NAND Gates
  • M143 10 x 2-Input NAND Gates
  • M145 7 x 3-Input NAND Gates
  • M147 5 x 4-Input, 1 x 2-Input NAND Gates
  • M152 Dual Non-inverting Binary to Octal with Enable
  • M165 Memory buffer, Inverting and Non-inverting Output
  • M171 2-2-2-3 AND-NOR
  • M173 10 x 2-input AND gates
  • M174 4 En x 9 out mixer
  • M175 7 x 3-input AND gates
  • M177 5 x 4-Input AND Gates
  • M178 8 En x 6 out mixer
  • M181 Non-inverting 2-2-2-3 AND-NOR
  • M211 6-Bit Up/Down Counter
  • M241 6 x D Flip-flops with common clock
  • M243 8 x D Flip-flops with 2 common clocks
  • M246 5 x D Flip-Flops
  • M253 16 Word, 12-bit Memory
  • M307 Integrating One Shot
  • M321 Tapped Delay Line
  • M362 Delay, 25 to 50 ns
  • M401 Variable Clock
  • M603 Pulse Amplifiers
  • M612 6 Power Gates
  • M783 UNIBUS Drivers
  • M784 UNIBUS Receiver
  • M785 UNIBUS Transceiver
  • M931 15 Terminators
  • M969 24 Level Terminators
  • M511 UNIBUS Receivers - sources differ as to whether or not this is used
  • W990 Connectors
  • M105 Address Selector - used to set its bus address
  • M7820 Interrupt Control
  • M7110 Line Control Module - one per line

The number of each type used is currently unknown; likewise the locations in the backplane (except the M7110's)

See also

Further reading

  • DS11 Multiple Line Synchronous Interface Maintenance Manual (DEC-00-DS11-DB; not available online, but in fiche)

External links

Retrieved from "https://gunkies.org/w/index.php?title=DS11_Multiple_Line_Synchronous_Interface&oldid=32545"