Motorola MVME1X7P - Manual (Page 195)

GCSR Programming Model
http://www.motorola.com/computer/literature 2-105
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SIG3 The SIG3 bit is set when a VMEbus master writes a 1 to
it. When the SIG3 bit is set, an interrupt is sent to the local
bus interrupter. The SIG3 bit is cleared when the local
processor writes a 1 to the SIG3 bit in this register or the
CSIG3 bit in the local interrupt clear register.
LM0 This bit is cleared by an LM0 cycle on the VMEbus.
When this bit is cleared, an interrupt is set to the local bus
interrupter. This bit is set when the local processor or a
VMEbus master writes a 1 to the LM0 bit in this register
or the CLM0 bit in local interrupt clear register.
LM1 This bit is cleared by an LM1 cycle on the VMEbus.
When this bit is cleared, an interrupt is set to the local bus
interrupter. This bit is set when the local processor or a
VMEbus master writes a 1 to the LM1 bit in this register
or the CLM1 bit in local interrupt clear register.
LM2 This bit is cleared by an LM2 cycle on the VMEbus. This
bit is set when the local processor or a VMEbus master
writes a 1 to the LM0 bit in this register.
LM3 This bit is cleared by an LM3 cycle on the VMEbus. This
bit is set when the local processor or a VMEbus master
writes a 1 to the LM3 bit in this register.