CAEN
Electronic Instrumentation
UM5175
–
V2495/VX2495 User Manual rev. 1
36
VME Interface Registers (0x8000-0x80FF)
Address
Register/Content
Read/Write
BA + 0x8000
VME Control Register
R/W
BA + 0x8004
reserved
BA + 0x8008
VME Interrupt Level
R/W
BA + 0x800C
VME Interrupt Status ID
R/W
BA + 0x8010
reserved
BA + 0x8014
reserved
BA + 0x8018
reserved
BA + 0x8020
Scratch Register
R/W
BA + 0x8024-0x80F8
reserved
BA + 0x80FC
VME Base Address
R
Tab. 9.2:
VME interface registers
VME interface registers implement VME-related control and status information. They can also be accessed from USB
for monitoring or configuration.
VME Control Register
Bit
Description
[31:1]
reserved
[0]
VME Interrupt Mode
0 = Release On Register Access (RORA) Interrupt mode (default)
1 = Release On AcKnowledge (ROAK) Interrupt mode
VME Interrupt Level Register
Bit
Description
[31:3]
reserved
[2:0]
VME Interrupt Level:
0 = interrupts are disabled (default)
n = interrupts on IRQn line are enabled (n = 1, 2, ..., 7)
VME Interrupt Status ID Register
Bit
Description
[31:0]
This register contains the 32-bit STATUS/ID set by the module on the VME
data bus during the Interrupt Acknowledge cycle
Scratch Register
Bit
Description
[31:0]
This register allows to perform 32-bit accesses for test purposes. Default
value is 0xAAAAAAAA
VME Base Address Register
Bit
Description
[31:0]
This register allows to read the value of on-board rotary switches (see
.
It is meant to be used from the USB interface for testing purposes