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50 SM8000 Series Programming
Control Register (cont.)
D3
Relay Reset Select
Bit
0 = The Openbus signal is not selected to reset this module's relays
1 = The Openbus signal is selected to reset this module's relays
Pon state = 0
Many plug-in modules may be programmed to be listeners on the
Openbus.
D2-D0 Unused
Delay Register - Read and Write
ADDR
Plug-In LA+0x102
D15-D0
Data Bus
16 Bit
This register is used to set the time that the plug-in module will
hold the Board Busy signal active. The Board Busy signal is set
every time the plug-in receives a Write to a relevant Relay
Register memory space. The Board Busy signal will be removed at
the end of the time out that is set by the value contained in this
register. For each count loaded into this register, the Board Busy
signal will be held active for 1μs. The delay may be set from 0 to
approximately 65ms, thus accommodating a wide variation in test
station requirements.
This function is only relevant to the operation of the prism
switches. Writes to the optical multi switch and attenuator
modules hold the Board Busy signal active until the optical
channel has settled.
The Board Busy signal may be monitored by the user, in either a
polled or an interrupt fashion, and is to be used as an indication
that the relays in the newly actuated path have settled.
Alternatively, the Board Busy signal may also be used to drive the
TTL Trigger Bus. See the Board Busy, Interrupt Control and Busy
Trigger Control Register descriptions in the A16 address space.