Model 466-1 Adapter
10 Adapter Functions
1.7.3 Programmed Interrupts
Two types of programmed interrupts may be exchanged:
PT
(Programmed
interrupt to Transmitter / SBus) and
PR
(Programmed interrupt to Receiver /
VMEbus). See section 1.7.3.1 for information on
PT Interrupt
s. See section
1.7.3.2 for a description of
PR Interrupt
s.
1.7.3.1 Programmed Interrupt To Transmitter (PT)
The
PT Interrupt
is used when a VMEbus processor sends a programmed
interrupt to the SBus.
VMEbus Adapter Card (receiver)
SBus Adapter Card (transmitter)
PT
PT
FF
CINTx
VMEbus
Processor
SBus
Interrupt
SPARCstation
(Cable Interrupt)
(Reset PT Flip-Flop)
>
<
<
>
>
Programmed Interrupt To Transmitter (SBus)
-- PT Interrupt --
PT Interrupts
work as follows:
1.
A VMEbus processor writes to the adapter card Local Command Register
and sets the
PT Interrupt
flip-flop on the adapter card in its chassis.
2.
The
PT Interrupt
line can be connected to any unused cable interrupt line
(CINTx) that sends the interrupt to the SBus chassis.
3.
When the SBus processor sees the
PT Interrupt
, it can clear the
PT
flip-flop by setting bit 6 of Remote Command Register 1.
Содержание 466-1
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Страница 107: ...Model 466 1 Adapter Jumper Configuration Worksheets 97 D 1 SBus Adapter Card Worksheet J1...
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