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  1. Date:  Dec 28, 1989                                 X3T9.2/90-004
  2.  
  3. To:  X3T9.2 Committee (SCSI)
  4. From:  George Penokie (IBM)
  5.  
  6. Subject:  32 Bit Data Path on a Single 110 pin Connector
  7.  
  8.  
  9. This is the appendix form of the 32 Bit Data Path on a single 110
  10. pin connector.  In an attempt to follow the recommended
  11. principles for appendixes (in other words the KISS principle) I
  12. have limited the appendix to only include the following:
  13.  
  14. -A short description of the physical interconnect methods.
  15.  
  16. -References to the B cable for all cable, connector, and term
  17.  power specifications.
  18.  
  19. -Pin outs for the P and L cables single ended and differential
  20.  connectors.
  21.  
  22. -No reference to additional SCSI ID addresses.
  23.  
  24. If this is appendix is adopted I would recommend a separated CCS
  25. type document be published which incorporates proposal X3T9.2/89-
  26. 094Rx.
  27. Appendix K - Alternate Connectors for 16/32 Bit Data Path
  28.  
  29.  
  30. K.1. Physical Description
  31.  
  32.   16 bit cabling alternatives:
  33.  
  34.   SCSI devices are daisy-chained together using a common 68-conductor P cable.
  35. Both ends of all cables are terminated.  All signals are common between all
  36. SCSI devices on the P cable.  Various width SCSI devices may be mixed.
  37.  
  38.   Physical devices with P cable connectors shall connect the low data byte
  39. (DB0-DB7,P) to the P connector.  The high data byte (DB8-DB15,P1) may be
  40. connected to the P connector.
  41.  
  42.   16/32 bit cabling alternatives:
  43.  
  44.   SCSI devices are daisy-chained together using a common 110-conductor L cable.
  45. Both ends of all cables are terminated.  All signals are common between all
  46. SCSI devices on the L cable.  Various width SCSI devices may be mixed.
  47.  
  48.   Physical devices with L cable connectors shall connect the low data byte
  49. (DB0-DB7,P) to the P connector.  The three high data bytes
  50. (DB8-DB15,P1,DB16-DB24,P2,DB25-DB32) may be connected to the L connector.
  51.  
  52.   The A/B cable and L cable alternatives are mutually exclusive within a
  53. system.  Physical devices with A cable or P cable connectors may be attached to
  54. L cables.  Physical devices with B cable connectors shall not be attached to L
  55. or P cables.  Physical devices with L or P cable connectors shall not be
  56. attached to A or A/B cables.
  57.  
  58. K.2. Cabling
  59.  
  60.   The P and L cables shall follow the same specifications for cables and
  61. connectors as described for the B cable in Section 4 of this standard.
  62.  
  63. K.3. Terminator Power
  64.  
  65.   The P and L cables shall follow the same specifications for terminator power
  66. as described for the B cable in Section 4 of this standard.
  67.  
  68. K.4. P/L Cable Contact Assignments
  69.  
  70.             Table K-1: Single-Ended Contact Assignments - P cable
  71.  
  72. ==============================================================================
  73.                     Connector       Cable        Connector
  74.       Signal         Contact      Conductor       Contact        Signal
  75.        Name           Number       Number          Number         Name
  76. ------------------------------------------------------------------------------
  77.       GROUND            1           1 |  2          35           -DB(12)
  78.       GROUND            2           3 |  4          36           -DB(13)
  79.       GROUND            3           5 |  6          37           -DB(14)
  80.       GROUND            4           7 |  8          38           -DB(15)
  81.       GROUND            5           9 | 10          39           -DB(P1)
  82.       GROUND            6          11 | 12          40           -DB(0)
  83.       GROUND            7          13 | 14          41           -DB(1)
  84.       GROUND            8          15 | 16          42           -DB(2)
  85.       GROUND            9          17 | 18          43           -DB(3)
  86.       GROUND           10          19 | 20          44           -DB(4)
  87.       GROUND           11          21 | 22          45           -DB(5)
  88.       GROUND           12          23 | 24          46           -DB(6)
  89.       GROUND           13          25 | 26          47           -DB(7)
  90.       GROUND           14          27 | 28          48           -DB(P)
  91.       GROUND           15          29 | 30          49           GROUND
  92.       GROUND           16          31 | 32          50           GROUND
  93.       TERMPWR          17          33 | 34          51           TERMPWR
  94.       TERMPWR          18          35 | 36          52           TERMPWR
  95.       RESERVED         19          37 | 38          53           RESERVED
  96.       GROUND           20          39 | 40          54           GROUND
  97.       GROUND           21          41 | 42          55           -ATN
  98.       GROUND           22          43 | 44          56           GROUND
  99.       GROUND           23          45 | 46          57           -BSY
  100.       GROUND           24          47 | 48          58           -ACK
  101.       GROUND           25          49 | 50          59           -RST
  102.       GROUND           26          51 | 52          60           -MSG
  103.       GROUND           27          53 | 54          61           -SEL
  104.       GROUND           28          55 | 56          62           -C/D
  105.       GROUND           29          57 | 58          63           -REQ
  106.       GROUND           30          59 | 60          64           -I/O
  107.       GROUND           31          61 | 62          65           -DB(8)
  108.       GROUND           32          63 | 64          66           -DB(9)
  109.       GROUND           33          65 | 66          67           -DB(10)
  110.       GROUND           34          67 | 68          68           -DB(11)
  111. ==============================================================================
  112.  
  113.          NOTES:
  114.            (1) The minus sign next to a signal indicates active low.
  115.            (2) The conductor number refers to the conductor position when
  116.          using 0.025-inch centerline flat ribbon cable.  Other cable types
  117.          may be used to implement equivalent contact assignments.
  118.            (3) 8 bit devices which connect to the P-cable shall leave the
  119.          following signals open:
  120.          -DB(12) -DB(13) -DB(14) -DB(15) -DB(P1) -DB(8) -DB(9) -DB(10) -DB(11)
  121.          All other signals shall be connected as defined.
  122.  
  123.             Table K-2: Single-Ended Contact Assignments - L cable
  124.  
  125. ==============================================================================
  126.                     Connector       Cable        Connector
  127.       Signal         Contact      Conductor       Contact        Signal
  128.        Name           Number       Number          Number         Name
  129. ------------------------------------------------------------------------------
  130.       GROUND            1           1 |  2          56           GROUND
  131.       GROUND            2           3 |  4          57           -DB(24)
  132.       GROUND            3           5 |  6          58           -DB(25)
  133.       GROUND            4           7 |  8          59           -DB(26)
  134.       GROUND            5           9 | 10          60           -DB(27)
  135.       GROUND            6          11 | 12          61           -DB(28)
  136.       GROUND            7          13 | 14          62           -DB(29)
  137.       GROUND            8          15 | 16          63           -DB(30)
  138.       GROUND            9          17 | 18          64           -DB(31)
  139.       GROUND           10          19 | 20          65           -DB(P3)
  140.       GROUND           11          21 | 22          66           -DB(12)
  141.       GROUND           12          23 | 24          67           -DB(13)
  142.       GROUND           13          25 | 26          68           -DB(14)
  143.       GROUND           14          27 | 28          69           -DB(15)
  144.       GROUND           15          29 | 30          70           -DB(P1)
  145.       GROUND           16          31 | 32          71           -DB(0)
  146.       GROUND           17          33 | 34          72           -DB(1)
  147.       GROUND           18          35 | 36          73           -DB(2)
  148.       GROUND           19          37 | 38          74           -DB(3)
  149.       GROUND           20          39 | 40          75           -DB(4)
  150.       GROUND           21          41 | 42          76           -DB(5)
  151.       GROUND           22          43 | 44          77           -DB(6)
  152.       GROUND           23          45 | 46          78           -DB(7)
  153.       GROUND           24          47 | 48          79           -DB(P)
  154.       GROUND           25          49 | 50          80           GROUND
  155.       GROUND           26          51 | 52          81           GROUND
  156.       TERMPWR          27          53 | 54          82           TERMPWR
  157.       TERMPWR          28          55 | 56          83           TERMPWR
  158.       TERMPWR          29          57 | 58          84           TERMPWR
  159.       GROUND           30          59 | 60          85           GROUND
  160.       GROUND           31          61 | 62          86           -ATN
  161.       GROUND           32          63 | 64          87           GROUND
  162.       GROUND           33          65 | 66          88           -BSY
  163.       GROUND           34          67 | 68          89           -ACK
  164.       GROUND           35          69 | 70          90           -RST
  165.       GROUND           36          71 | 72          91           -MSG
  166.       GROUND           37          73 | 74          92           -SEL
  167.       GROUND           38          75 | 76          93           -C/D
  168.       GROUND           39          77 | 78          94           -REQ
  169.       GROUND           40          79 | 70          95           -I/O
  170.       GROUND           41          81 | 82          96           -DB(8)
  171.       GROUND           42          83 | 84          97           -DB(9)
  172.       GROUND           43          85 | 86          98           -DB(10)
  173.       GROUND           44          87 | 88          99           -DB(11)
  174.       GROUND           45          89 | 90          100          GROUND
  175.       GROUND           46          91 | 92          101          -DB(16)
  176.       GROUND           47          93 | 94          102          -DB(17)
  177.       GROUND           48          95 | 96          103          -DB(18)
  178.       GROUND           49          97 | 98          104          -DB(19)
  179.       GROUND           50          99 | 100         105          -DB(20)
  180.       GROUND           51         101 | 102         106          -DB(21)
  181.       GROUND           52         103 | 104         107          -DB(22)
  182.       GROUND           53         105 | 106         108          -DB(23)
  183.       GROUND           54         107 | 108         109          -DB(P2)
  184.       GROUND           55         109 | 110         110          GROUND
  185. ==============================================================================
  186.  
  187.         NOTES:
  188.           (1) The minus sign next to a signal indicates active low.
  189.           (2) The conductor number refers to the conductor position when
  190.         using 0.025- inch centerline flat ribbon cable.  Other cable types
  191.         may be used to implement equivalent contact assignments.
  192.           (3) 8 bit devices which connect to the L-cable shall leave the
  193.         following signals open:
  194.         -DB(12) -DB(13) -DB(14) -DB(15) -DB(P1) -DB(8) -DB(9) -DB(10) -DB(11)
  195.         -DB(20) -DB(21) -DB(22) -DB(23) -DB(P2) -DB(16) -DB(17) -DB(18) -DB(19)
  196.         -DB(28) -DB(29) -DB(30) -DB(31) -DB(P3) -DB(24) -DB(25) -DB(26) -DB(27)
  197.         All other signals shall be connected as defined.
  198.           (4) 16 bit devices which connect to the L-cable shall leave the
  199.         following signals open:
  200.         -DB(20) -DB(21) -DB(22) -DB(23) -DB(P2) -DB(16) -DB(17) -DB(18) -DB(19)
  201.         -DB(28) -DB(29) -DB(30) -DB(31) -DB(P3) -DB(24) -DB(25) -DB(26) -DB(27)
  202.         All other signals shall be connected as defined.
  203.             Table K-3: Differential Contact Assignments - P cable
  204.  
  205. ==============================================================================
  206.                     Connector       Cable        Connector
  207.       Signal         Contact      Conductor       Contact        Signal
  208.        Name           Number       Number          Number         Name
  209. ------------------------------------------------------------------------------
  210.       +DB(12)           1           1 |  2          35           -DB(12)
  211.       +DB(13)           2           3 |  4          36           -DB(13)
  212.       +DB(14)           3           5 |  6          37           -DB(14)
  213.       +DB(15)           4           7 |  8          38           -DB(15)
  214.       +DB(P1)           5           9 | 10          39           -DB(P1)
  215.       GROUND            6          11 | 12          40           GROUND
  216.       +DB(0)            7          13 | 14          41           -DB(0)
  217.       +DB(1)            8          15 | 16          42           -DB(1)
  218.       +DB(2)            9          17 | 18          43           -DB(2)
  219.       +DB(3)           10          19 | 20          44           -DB(3)
  220.       +DB(4)           11          21 | 22          45           -DB(4)
  221.       +DB(5)           12          23 | 24          46           -DB(5)
  222.       +DB(6)           13          25 | 26          47           -DB(6)
  223.       +DB(7)           14          27 | 28          48           -DB(7)
  224.       +DB(P)           15          29 | 30          49           -DB(P)
  225.       DIFFSENS         16          31 | 32          50           GROUND
  226.       TERMPWR          17          33 | 34          51           TERMPWR
  227.       TERMPWR          18          35 | 36          52           TERMPWR
  228.       RESERVED         19          37 | 38          53           RESERVED
  229.       +ATN             20          39 | 40          54           -ATN
  230.       GROUND           21          41 | 42          55           GROUND
  231.       +BSY             22          43 | 44          56           -BSY
  232.       +ACK             23          45 | 46          57           -ACK
  233.       +RST             24          47 | 48          58           -RST
  234.       +MSG             25          49 | 50          59           -MSG
  235.       +SEL             26          51 | 52          60           -SEL
  236.       +C/D             27          53 | 54          61           -C/D
  237.       +REQ             28          55 | 56          62           -REQ
  238.       +I/O             29          57 | 58          63           -I/O
  239.       GROUND           30          59 | 60          64           GROUND
  240.       +DB(8)           31          61 | 62          65           -DB(8)
  241.       +DB(9)           32          63 | 64          66           -DB(9)
  242.       +DB(10)          33          65 | 66          67           -DB(10)
  243.       +DB(11)          34          67 | 68          68           -DB(11)
  244. ==============================================================================
  245.  
  246.          NOTES:
  247.            (1) The conductor number refers to the conductor position
  248.          when using 0.025- inch centerline flat ribbon cable.  Other cable
  249.          types may be used to implement equivalent contact assignments.
  250.            (2) 8 bit devices which connected to the P-cable shall leave the
  251.          following signals open:
  252.          -DB(12) -DB(13) -DB(14) -DB(15) -DB(P1) -DB(8) -DB(9) -DB(10) -DB(11)
  253.          +DB(12) +DB(13) +DB(14) +DB(15) +DB(P1) +DB(8) +DB(9) +DB(10) +DB(11)
  254.          All other signals shall be connected as defined.
  255.  
  256.             Table K-4: Differential Contact Assignments - L cable
  257.  
  258. =============================================================================
  259.                     Connector       Cable        Connector
  260.       Signal         Contact      Conductor       Contact        Signal
  261.        Name           Number       Number          Number         Name
  262. ------------------------------------------------------------------------------
  263.       GROUND            1           1 |  2          56           GROUND
  264.       +DB(24)           2           3 |  4          57           -DB(24)
  265.       +DB(25)           3           5 |  6          58           -DB(25)
  266.       +DB(26)           4           7 |  8          59           -DB(26)
  267.       +DB(27)           5           9 | 10          60           -DB(27)
  268.       +DB(28)           6          11 | 12          61           -DB(28)
  269.       +DB(29)           7          13 | 14          62           -DB(29)
  270.       +DB(30)           8          15 | 16          63           -DB(30)
  271.       +DB(31)           9          17 | 18          64           -DB(31)
  272.       +DB(P3)          10          19 | 20          65           -DB(P3)
  273.       +DB(12)          11          21 | 22          66           -DB(12) 
  274.       +DB(13)          12          23 | 24          67           -DB(13) 
  275.       +DB(14)          13          25 | 26          68           -DB(14) 
  276.       +DB(15)          14          27 | 28          69           -DB(15) 
  277.       +DB(P1)          15          29 | 30          70           -DB(P1) 
  278.       GROUND           16          31 | 32          71           GROUND  
  279.       +DB(0)           17          33 | 34          72           -DB(0)  
  280.       +DB(1)           18          35 | 36          73           -DB(1)  
  281.       +DB(2)           19          37 | 38          74           -DB(2)  
  282.       +DB(3)           20          39 | 40          75           -DB(3)  
  283.       +DB(4)           21          41 | 42          76           -DB(4)  
  284.       +DB(5)           22          43 | 44          77           -DB(5)  
  285.       +DB(6)           23          45 | 46          78           -DB(6)  
  286.       +DB(7)           24          47 | 48          79           -DB(7)  
  287.       +DB(P)           25          49 | 50          80           -DB(P)  
  288.       DIFFSENS         26          51 | 52          81           GROUND
  289.       TERMPWR          27          53 | 54          82           TERMPWR 
  290.       TERMPWR          28          55 | 56          83           TERMPWR 
  291.       TERMPWR          29          57 | 58          84           TERMPWR 
  292.       +ATN             30          59 | 60          85           -ATN    
  293.       GROUND           31          61 | 62          86           GROUND  
  294.       +BSY             32          63 | 64          87           -BSY    
  295.       +ACK             33          65 | 66          88           -ACK    
  296.       +RST             34          67 | 68          89           -RST    
  297.       +MSG             35          69 | 70          90           -MSG    
  298.       +SEL             36          71 | 72          91           -SEL    
  299.       +C/D             37          73 | 74          92           -C/D    
  300.       +REQ             38          75 | 76          93           -REQ    
  301.       +I/O             39          77 | 78          94           -I/O    
  302.       GROUND           40          79 | 70          95           GROUND  
  303.       +DB(8)           41          81 | 82          96           -DB(8)  
  304.       +DB(9)           42          83 | 84          97           -DB(9)  
  305.       +DB(10)          43          85 | 86          98           -DB(10) 
  306.       +DB(11)          44          87 | 88          99           -DB(11) 
  307.       GROUND           45          89 | 90          100          GROUND
  308.       +DB(16)          46          91 | 92          101          -DB(16)
  309.       +DB(17)          47          93 | 94          102          -DB(17)
  310.       +DB(18)          48          95 | 96          103          -DB(18)
  311.       +DB(19)          49          97 | 98          104          -DB(19)
  312.       +DB(20)          50          99 | 100         105          -DB(20)
  313.       +DB(21)          51         101 | 102         106          -DB(21)
  314.       +DB(22)          52         103 | 104         107          -DB(22)
  315.       +DB(23)          53         105 | 106         108          -DB(23)
  316.       +DB(P2)          54         107 | 108         109          -DB(P2)
  317.       GROUND           55         109 | 110         110          GROUND
  318. ==============================================================================
  319.  
  320.          NOTES:
  321.            (1) The minus sign next to a signal indicates active low.
  322.            (2) The conductor number refers to the conductor position when
  323.          using 0.025- inch centerline flat ribbon cable.  Other cable types
  324.          may be used to implement equivalent contact assignments.
  325.           (3) 8 bit devices which connect to the L-cable shall leave the
  326.         following signals open:
  327.         -DB(12) -DB(13) -DB(14) -DB(15) -DB(P1) -DB(8) -DB(9) -DB(10) -DB(11)
  328.         +DB(12) +DB(13) +DB(14) +DB(15) +DB(P1) +DB(8) +DB(9) +DB(10) +DB(11)
  329.         -DB(20) -DB(21) -DB(22) -DB(23) -DB(P2) -DB(16) -DB(17) -DB(18) -DB(19)
  330.         +DB(20) +DB(21) +DB(22) +DB(23) +DB(P2) +DB(16) +DB(17) +DB(18) +DB(19)
  331.         -DB(28) -DB(29) -DB(30) -DB(31) -DB(P3) -DB(24) -DB(25) -DB(26) -DB(27)
  332.         +DB(28) +DB(29) +DB(30) +DB(31) +DB(P3) +DB(24) +DB(25) +DB(26) +DB(27)
  333.         All other signals shall be connected as defined.
  334.           (4) 16 bit devices which connect to the L-cable shall leave the
  335.         following signals open:
  336.         -DB(20) -DB(21) -DB(22) -DB(23) -DB(P2) -DB(16) -DB(17) -DB(18) -DB(19)
  337.         +DB(20) +DB(21) +DB(22) +DB(23) +DB(P2) +DB(16) +DB(17) +DB(18) +DB(19)
  338.         -DB(28) -DB(29) -DB(30) -DB(31) -DB(P3) -DB(24) -DB(25) -DB(26) -DB(27)
  339.         +DB(28) +DB(29) +DB(30) +DB(31) +DB(P3) +DB(24) +DB(25) +DB(26) +DB(27)
  340.         All other signals shall be connected as defined.
  341.