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Annotation of researchv9/jerq/src/32ld/proto.h, revision 1.1

1.1     ! root        1: /*
        !             2:  *     Packet format:
        !             3:  *
        !             4:  *     0x80^Seq | Size | 4 bytes of address | 0 or more data bytes | CRC1 | CRC2
        !             5:  *
        !             6:  *     where PKTASIZE <= Size <= (PKTASIZE+MAXPKTDSIZE).
        !             7:  *
        !             8:  *     If Size == PKTASIZE then the address is the start address.
        !             9:  *     If Size > PKTASIZE then load data contiguously at the address.
        !            10:  *
        !            11:  *     Acknowledgements consist of the first byte
        !            12:  *     from each correctly received packet (Seq)
        !            13:  *     acks apply to all packets sent, up to and including the one acked.
        !            14:  *     Timeouts cause retransmission of all unacknowledged packets
        !            15:  */
        !            16: 
        !            17: #define        MAXPKTSIZE      128             /* Efficient size for system */
        !            18: #define        PKTHDRSIZE      2               /* Seq + Size */
        !            19: #define        PKTCRCSIZE      2               /* CRC 16 */
        !            20: #define        PKTASIZE        4               /* sizeof(long) on MC68000 */
        !            21: #define        MAXPKTDSIZE     MAXPKTSIZE-(PKTHDRSIZE+PKTCRCSIZE+PKTASIZE)
        !            22: 
        !            23: #define        PTYP            0xc0            /* Masked with Seq to guarantee non-zero */
        !            24: #define        ACKON           0x80            /* Ack expected for this packet */
        !            25: #define        ACKOFF          0xc0            /* No ack expected, but remember errors */
        !            26: #define        NOCRC           0x40            /* No error detection on packet */
        !            27: #define        SEQMASK         (~PTYP)
        !            28: #define SEQMOD         0x40            /* SEQMASK+1 */
        !            29: 
        !            30: #define        WAIT    1
        !            31: #define        OK      2
        !            32: 
        !            33: #define NPBUFS 2
        !            34: 
        !            35: extern char freepkts;                  /* 0 or 1 */

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