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Annotation of cci/d/ether/PROB_REP, revision 1.1

1.1     ! root        1: 
        !             2: 
        !             3: 
        !             4: 
        !             5: COMPUTER CONSOLES INC.                         INTER-OFFICE MEMO
        !             6: -----------------------------------------------------------------
        !             7: 
        !             8:                                                Jan 7th, 1985
        !             9: 
        !            10: 
        !            11: TO:      Naresh Desai
        !            12: 
        !            13: FR:      Pham, Phuc M.
        !            14: 
        !            15: SUBJECT:  Report of Ethernet Controller Diagnostic Problems.
        !            16: 
        !            17: 
        !            18:        Following are the problems of the ethernet controller
        !            19: functionality that I found while trying to develop a diagnostic
        !            20: program for it.
        !            21: 
        !            22: 
        !            23:        1. In loop 2 mode, the rbc of the receiver buffer are
        !            24:           not updated to reflect the length of the buffered
        !            25:           message, but instead, the crs (the first word of the
        !            26:           receive buffer) always contains a value of 0xB000.
        !            27:           This causes the error-checking mechanism to generate
        !            28:           the following errors even though the message is corr-
        !            29:           ectly received.
        !            30: 
        !            31:                - CRC error
        !            32:                - Underrun error (because rbc = 0)
        !            33:                - Oddbit error
        !            34: 
        !            35:        2. In loop 3 mode, the crs word of the receive buffer
        !            36:           always contains a value of 0xA000 which, again,
        !            37:           causes the error checking mechanism to generate CRC
        !            38:           and underrun errors for every message transmitted.
        !            39:           Moreover, as seen in the attached sample run, no mess-
        !            40:           age has shown up in the receive buffers. 
        !            41: 

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