Master control status block (mcsb), Master status register (msr) – Interphase Tech CONDOR 4221 User Manual
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Master Control Status Block (MCSB)
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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
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0x000
Master Status Register
0x002
Reserved
0x004
Master Control Register
0x006
to
0x00F
Reserved
(10 Bytes)
Master Status Register
Addr
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0x000
BOK CNA