
40
Register Descriptions
Type B Interrupts The interrupting M-Module removes the interrupt
request via a hardware method (on IACK* going low)
but provides no vector information for the interrupt.
This is the same as Type C interrupts except that no
vector is supplied and DTACK* is not asserted.
Type C Interrupts The interrupting M-Module removes the interrupt
request via a hardware method and provides an
interrupt vector on the data bus and DTACK* is
asserted during the interrupt acknowledge cycle. The
M-Module removes the interrupt request by IACK*
going low.
In VXI specifications however, only two types of interrupts are defined;
RORA (Release on Register Access) and ROAK (Release on
Acknowledge). The Agilent E2251A Carrier converts M-Module Type A
interrupts to RORA and Types B and C interrupts to ROAK (default).
RORA Interrupts The interrupting device provides its logical address on
the data bus (MD0 - MD7) during the interrupt
acknowledge cycle that was initiated in response to its
interrupt request. It does not remove the interrupt
request until its Status/Control register is accessed.
ROAK Interrupts The interrupting device removes the interrupt request
upon the presence of a properly addressed interrupt
acknowledge cycle and provides its logical address on
the data bus (MD0 - MD7). A cause/status byte is also
placed on the data bus (MD15 - MD8)
Содержание E2259A
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