Modifications to Support Multiple Crates with the TI Ed Jastrzembski – 9/16/09

SERDES MANCHESTER DECODER FPGA CLOCK CONTROL VME P1 P2 VXS CLK250 CLK125 CLK31.25 TRIG1 TRIG2 SYNC_R BUSY TRIGLINK STATUS CLKSYNC CLK250 Basic TI Architecture HFBR 7934

HFBR 7934 SERDES MANCHESTER DECODER FPGA CLOCK CONTROL VME P1 P2 VXS CLK250 CLK125 CLK31.25 TRIG1 TRIG2 SYNC_R BUSY TRIGLINK STATUS CLKSYNC CLK250 HFBR 7934 TRIGLINK STATUS CLKSYNC CLK250 SERDES (up to 4) MANCHESTER ENCODER CLOCK GEN EXT_TRIG Enhanced TI Architecture / 8 P0

Implement TD function on TI Implement basic TS functions on TI (handle multiple external triggers) Note that HFBR7934 has 4 transmit /receive pairs Can also use upper HFBR7934 to transmit TRIGGER / CLK250 / CLKSYNC and receive STATUS Supports up to 6 crates in a group (local + 5 remote) Additional fiber runs are necessary for crates in a group HFBR7934 are expensive (~$500 each), so cannot install on every TI HFBR7934 uses socket, so easy upgrade Need only one upgraded TI per group If a group has more than 6 crates, install another trigger distribution crate (TS, SD, TD) Option to use FPGA with integrated SERDES (Xilinx, Altera)

Can configure (FPGA) fiber port to be either in TI mode (receive trigger data) or TD mode (transmit trigger data) Allows for grouping of crates while system fiber connections remain in place (see Figure)

TI TD TI MASTER TI GROUP FIBER RUN SYSTEM FIBER RUN