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Status byte and SRQ
Service request is controlled by two 8-bit registers: the Status Byte Register and the Service
Request Enable Registers. Figure 3-5 shows the structure for these registers.
Figure 3-5
Status byte and service request (SRQ)
Service
Request
Generation
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Status Summary Messages
RQS
ESB
(B6)
* STB?
Serial Poll
(B7)
(B5)
MSS
&
OR
* SRE
ESB
* SRE?
(B7)
(B6)
(B5)
32
Decimal
Weights
5
(2
)
MSS = Master Summary Status
RQS = Request for Service
ESB = Event Summary Bit
MAV = Message Available
EAV = Error Available
MAV
EAV
(B4)
(B3)
(B2)
(B1)
(B0)
&
&
MAV
EAV
(B4) (B3)
(B2) (B1)
(B0)
16
4
4
2
(2
)
(2
)
& = Logical AND
OR = Logical OR
Operation
3-13
Status Byte
Register
Service Request
Enable Register
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