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VECTOR ELECTRONICS & TECHNOLOGY, INC .
The geographical address parity [GAP*] is tied high or floating,
GAP*
IACK*
IRQ1*-IRQ7*
LI/I*
LI/O*
LWORD*
MCLK, MCTL, MMD,
MPR, MSD
RESERVED
RESP*
depending upon the parity of the geographical address lines [GA0*-
GA4*]. It is an open collector signal, and was added to the 160 pin
P1/J1 connector in the VME64x specification.
Ground [GND] is used both as a signal reference and a power return
path.
Interrupt acknowledge [IACK*] is driven by interrupt handlers in
response to interrupt re-quests. It is connected to IACKIN* at slot
01 (on the backplane), and used by the IACK* daisy-chain driver to
start propagation of the [IACKIN* - IACKOUT*] daisy-chain.
IACK* can be either an open-collector or a standard three-state
class signal.
The interrupt acknowledge daisy chain [IACKIN* - IACKOUT*] is
driven by the IACK* daisy-chain driver. These signals are used both
to indicate that an interrupt acknowledge cycle is in progress, and to
determine which interrupters should return a STATUS/ID. They are
standard totem-pole class signals.
Priority interrupt requests [IRQ1*-IRQ7*] are asserted by
interrupters. Level seven is the high-est priority, and level one the
lowest. They are open-collector class signals.
The live insertion input [LI/I*] signal is used to carry hot swap (live
insertion) control information. It is a three state driven signal and
was added to the 160 pin P1/J1 connector in the VME64x
specification.
The live insertion output [LI/O*] signal is used to carry hot swap
(live insertion) control information. It is a three state driven signal
and was added to the 160 pin P1/J1 connector in the VME64x
specification.
Long word [LWORD*] is driven by masters. It is used in
conjunction with A01, DS0* and DS1* to indicate the size of the
current data transfer. LWORD* is a standard three-state class signal.
During 64-bit address transfers, LWORD* doubles as address bit
A00. During 64-bit data transfers, LWORD* doubles as a data bit.
These signals are part of the IEEE 1149.5 MTM bus. They are
three-state driven signals which was added to the 160 pin P1/J1
connector in the VME64x specification.
The RESERVED signal pin is obsolete and is no longer used. Under
the IEEE 1014-1987 version of the bus specification there was a
single reserved pin. This pin was redefined under VME64 as the
RETRY* pin. The VME64x specification uses the names RsvB and
RsvU for reserved pins.
The response [RESP*] signal is used to carry the information as
defined by the 2eVME protocol. It was added to the 160 pin P1/J1
connector in the VME64x specification.
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