- Problem Statement/Title:

        Dstop: Slot1 dtransid input parity error

- Symptoms:

        'wfail' output reports something similar to the following:

           01  redxl> dumpf load dsmd.dstop.020513.1102.14
           02  Created Mon May 13 11:02:17 2002
           03  By hpost v. 1.2 Generic 112488-04 Mar 18 2002 14:43:00  executing as pid=7485
           04  On ssc name =  rasputin-sc0.SD_RASCAL.West.Sun.COM
           05  Domain =  0=A    Platform = rasputin
           06  Boards in dump: master SC    CPs/CSBs[1:0]: 3
           07            EXB[17:0]: 12100
           08          Slot0[17:0]: 12100
           09          Slot1[17:0]: 12100
           10  -D option, -d
           11  "DSMD DomainStop Dump"
           12  0 errors occurred while creating this dump.
           13  redxl> wfail
           14  SDI EX08/S0  Master_Stop_Status0[31:0] = 2004000F
           15          MStop0[3:0]: All SDI logic is DStopped + Recordstopped.
           16  SDI EX08/S0  Dstop0[31:0] = 01018100
           17          Dstop0[16]: D    DARB texp requests all Dstop (M)
           18          Dstop0[24]: D 1E SDI internal Slot1 port requested Dstop
           19  SDI EX08/S0  Slot1_Error1[31:0] = 08008800  Mask = 31404EBF
           20          S1Err1[27]: D 1E Slot1 dtransid input parity error (M)
           21              slt1_{datidbusp,datareqin,datid_vld,datareqout} = 4
           22              slt1_datidbus[11:0] = 000
           23  FAIL Slot IO8:  Dstop/Rstop detected by SDI
           24  Primary service FRU is Slot IO8.
           25  Secondary service FRU is EXB EX8.
           26  SDI EX13/S0: All SDI is DStopped and RStopped,         requested by DARB.
           27  SDI EX16/S0: All SDI is DStopped and RStopped,         requested by DARB.
           28  DARB C0: enabled ports (expanders)          [17:0]: 16100
           29  DARB C0: other darb req Dstop+Rstop for exps[17:0]: 00100
           30  DARB C1: enabled ports (expanders)          [17:0]: 16100
           31  DARB C1: other darb req Dstop+Rstop for exps[17:0]: 00100
            

- Troubleshooting:

        The dump header tells us that this Dstop was generated by dsmd (lines 10,11) 
        while a domain was active. This is also evident by the dumpf file name - 
        dsmd.dstop files are created by dsmd as part of an ASR. Walking the
        error chain:

         - Master SDI on EX8 calls for Dstop as directed by itself (line 18)
         - Master SDI on EX8 detects a DTransID input parity error for 
           Slot 1 (line 20). 
         - IO8 is FAILed from the configuration (line 23)
         - IO8 and EX8 are named as primary and secondary FRUs (lines 24,25)

        The SDC on a L1 board and the SDI exchange DTransID and DTarg information.
        The data exchange is parity protected. Since these pathways cross an
        interconnect, a single FRU cannot be isolated. Suspect components are
        IO8 and EX8.

- Resolution:

        Replace IO8. If errors persist, replace EX8.

- Summary of part number and patch ID's 

        http://infoserver.central/data/syshbk/Devices/I_O/IO_SunFire_15K_hsPCI_IO_Board.html
        http://infoserver.central/data/syshbk/Systems/SunFire15K/component.centerplane.html

- References and bug IDs

        SunSolve Article 48122
        SDI ASIC Specification

- Additional background information:

        DTransIDs are used for arbitration, deriving data path steering, and
        data identification (tags). The SDC must request access to use the data
        bus to the SDI. When granted, the SDC supplies the target information
        and generates parity. The SDI receives the information and checks 
        parity. A parity error constitutes a Dstop.

        The SDC<-->SDI Slot 1 interface signals are double pumped across a half
        width path. The arbitration connections between the SDI and SDC on a 
        Slot 1 board are as follows:

           slt1_datareqin_l             Unidirectional SDC request to use bidirectional path
           slt1_datareqout_l            High Priority request to SDC to get off the data path
                                         in 2 cycles
           slt1_dataid_vld_l            Only valid for an L1 hPCI board. Unidirection phase signal
                                         generated by the SDC and sampled by the SDI. It is monitored
                                         as a paranoid phase check.
           slt1_dataidbus_l<11:0>       Bidirectional data tag and arbitration steering information.
                                         Only bits [5:0] are valid in an hPCI board and have different
                                         meanings across cycles. For an MCPU, all bits [11:0] are used
                                         and repeated across cycles.
           slt1_dataibusp_l             Unidirectional parity on above signals. Generated only by
                                         the SDC and sent to the SDI for checking

        In the case of a parity error, the wfail provides an indication of the
        faulty signal (line 21), but the overall diagnosis is as above.

- Keywords

15K, 12K, SF15K, SF12K, Sun Fire 15K, Enterprise, Server, Sun Fire 12K,
Slot1 dtransid input parity error, dstop