Interphase Tech CONDOR 4221 User Manual download pdf (Page 69)

Master Control Status Block (MCSB)

The MCSB consists of a Master Status Register, which is used to report information from the controller to the host,

and the Master Control Register, which provides infrequently used control functions to the host.

Table 3-2. Master Control Status Block

Master Status Register (MSR)

The MSR reports to the host whether the controller is functional or not. Two bits are used.

Table 3-3. Master Status Register

Controller not available (CNA)

This bit is set to 1 by the controller to indicate that it is not available for receipt of a command. This condition

can be caused by a controller reset.

NOTE: On the V/Ethernet 4207 Eagle, the controller was defined to be available when this bit is

0. On the 4221 Condor, controller available is signalled by the presence of Board OK.

Board OK (BOK)

If 1, this bit indicates the controller has passed power up diagnostics, and is ready to accept commands.

Master Control/Status Block

Addr

1514131211109876543210

0x000

Master Status Register

0x002

Reserved

0x004

Master Control Register

0x006

0x00F

Reserved

(10 Bytes)

Master Status Register

Addr 1514131211109876543210

0x000 BOK CNA

1 2 ... 64 65 66 67 68 69 70 71 72 73 74 ... 123 124

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Interphase Tech CONDOR 4221 User Manual Page 69