Interphase Tech CONDOR 4221 Manuale Utente Scaricare il pdf (Pagina 84)

Chapter 3 - MACSI Host Interface

Address modifier

This field contains the VMEbus address modifier used for the transfer. Refer to your system documentation

for possible values for this field.

Memory type (MT)

This 2-bit field specifies the width of the data transfers. Permitted values are:

Table 3-17. Memory Type

Transfer type (TT)

This 2-bit field specifies the type of data transfer to be performed. Permitted values are:

Table 3-18. Transfer Type

Direction bit (DIR)

This bit is ignored.

Bit 9 Bit 8 Memory Type

0 0 Reserved (or Short I/O)

0 1 16 bit transfers

1 0 32 bit transfers

11Reserved

Bit 11 Bit 10 Transfer Type

00Normal Type

01Block Mode

10Reserved

1 1 VME D64 Block

1 2 ... 79 80 81 82 83 84 85 86 87 88 89 ... 123 124

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Interphase Tech CONDOR 4221 Manuale Utente Pagina 84