Interphase Tech CONDOR 4221 - Manual (Page 103)

Receive
91
Command Code
This field must contain 0x60 to execute the Receive IOPB.
Command Options
Table 3-33. Command Options
Interrupt enable
As defined in the Common IOPB Structures section.
Port selector
This field specifies the port to which the receive resources will be allocated. Valid ports range from 0 to 3.
Disable multiple completion (DMC)
Setting this bit prevents a returned frame from being returned using the multiple completion mechanism.
Non-port designated (ANY)
Setting this bit allows the receive resources specified in the command to be used for any port with incoming
traffic.
Buffer Address
This field contains the host VMEbus physical address for the start of the incoming data.
Maximum / Actual Transfer Size
When supplied by the host to the controller this field contains the maximum amount of data that can be transferred to
the specified location. This should be no smaller than the largest frame expected to be received, which for Ethernet
normally is 1518 bytes. When the controller returns this command for a received frame, this field will contain the
actual amount of data transferred, plus 4. Thus, a received frame of 64 bytes have 68 as the value returned in this field.
Packet Type / Length Field
When a particular MAC is placed in certain monitor modes, network traffic may be reported to the host without any
actual frame data being transferred. In this case, this field contains the Message Type frame header when operating on
an Ethernet compatible network, and the Length Field on an 802.3 network.
Command Options
Offst 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0x01 AN
Y DMC PORT RSV RSV IE