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2.3 Extension Card

The Ndigo Extension card provides additional inputs or outputs to the FPGA. It is connected

to the Samtec QSS-025 connector on an Ndigo5G by an Samtec SQCD cable assembly.

The Ndigo Extension Card provides up to ten single ended LEMO00 connectors. The circuit

connecting to each of these circuits can be chosen to provide inputs or outputs. These can be

AC or DC coupled. AC coupled inputs support NIM signaling.

The signals connect to 2.5V IO Pins of the Xilinx Virtex-5 FPGA. The current ﬁrmware

revision provides the following signal connections:

Connector QSS Pin FPGA Pin Direction Signal

LEMO00: CH0 22 AD9 Input Ndigo Extension digital channel 0

LEMO00: CH1 18 AE10 Input Ndigo Extension digital channel 1

LEMO00: CH2 14 D10 - not connected

LEMO00: CH3 10 AF9 Output 39 MHz clock for HPTDC

LEMO00: CH4 6 AD11 Output 39 MHz clock for HPTDC

LEMO00: CH5 5 AE7 Output 39 MHz clock for HPTDC

LEMO00: CH6 9 AF7 Output 39 MHz clock for HPTDC

LEMO00: CH7 13 D9 - not connected

LEMO00: CH8 17 V9 Input Ndigo Extension digital channel 2

LEMO00: CH9 21 W9 Input Ndigo Extension digital channel 3

SYNC1: Sync-TDC8 26 F9 - not connected

SYNC1: Sync-HPTDC 44 AA7 Output Sync for HPTDC

The 4 digital inputs are routed to the bus inputs of the trigger matrix to be used for triggering.

The routing can be conﬁgured to either ORing the sync bus and extension channels or use the

extension channels exclusively.

Connector Extension Card Trigger matrix input Trigger matrix input

Digital Channel ignore cable = 0 ignore cable = 1

LEMO00: CH0 0 BUS0 = EXT0 | Sync Cable 0 BUS0 = EXT0

LEMO00: CH1 1 BUS1 = EXT1 | Sync Cable 1 BUS1 = EXT1

LEMO00: CH8 2 BUS2 = EXT2 | Sync Cable 2 BUS2 = EXT2

LEMO00: CH9 3 BUS3 = EXT3 | Sync Cable 3 BUS3 = EXT3

2.4 Ndigo5G Functionality

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