1. PCI/PCIe TFP Hardware
Bit
Name
Function
1 = Enable Lockout
9
EVSENSE2
Event2 Edge Select
0 = Rising
1 = Falling
10
EVENTEN2
Event2 Capture Enable
0 = Disable
1 = Enable
11
Reserved
12
LOCKEN3
EVENT3 Capture Lockout Enable
0 = Disable Lockout
1 = Enable Lockout
13
EVSENSE3
Event3 Edge Select
0 = Rising
1 = Falling
14
EVENTEN3
Event3 Capture Enable
0 = Disable
1 = Enable
15 - 31 Reserved
Note: Register contents are undefined at reset.
Examples: 0x08 enables event1, 0x400 enables event2, 0x4000 enables event3.
The EVSOURCE bit selects one of two signal sources for capturing time in the EVENT1 registers;
either the Event Input signal from the Signal I/O connector or the PPO/DDS Output. When PPO/DDS
is selected as the Event Source, the PPO/DDS and Event Input are internally connected, eliminating
the need for an external physical connection.
The EVENTENx bit is used to enable capture of time into the respective EVENTx registers.
The EVSENSEx bit controls the active edge that is used to capture time into the respective EVENTx
registers.
Enabling the Lockout function via the LOCKENx bit allows only the first instance of the selected sig-
nal source to latch time in the respective EVENTx registers, locking out any subsequent events. Use
the UNLOCKx register (0x08, 0x0C, 0x44) to re-arm the respective circuits.
ACK Register (0x14)
The ACK register is used to prevent dual-port RAM data contention when the same address on both
sides of a dual-port RAM is accessed simultaneously. See "Command 0x14: Set Periodic Output" on
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