Early DCT Upgrade Interface Studies from Philip Hart

Upgrade TSF Interface

Some discussion of the TSF interface upgrade assuming no weights are passed.
Older version of the above with weights.

Sample X packet (early test version) assuming no weights are passed.

Comments on the readout of the stereo layers.

TSF to DOCAZ Issues

Guenther recommends the National 217/218 21-bit channel link. It's small, fast (up to 1.8 Gbps throughput), interfaces to cmos, ... LVDS 217/218

We may want the 28-bit version for greater flexibility.
interpretation of Guenther's sketch

Some packet comments

Sample X packet
Sample Y packet

Rough calculation for comparisons:
phi+dphi+loc ~ 6+5+4 = 15 bits/segment/layer -> 150 bits/segment
using 16 words (60 MHz) gives 9.4 bits/segment to DocaZ
this means 169 bits into the DocaZ if there are 3*6 segments/DocaZ (6X+3Y).
Also need 9 frame bits for 6+3 TSFs (X+Y) for 178.
A more careful calculation of this scenario in Some packet comments above gives 165 pins into the DocaZ with ugly packing.
I think this scheme (3/8 DCH from 9 TSFs with 3 segments/TSFX + 4 segments/TSFY) has 4 output lines for 156+9+4=169 in all.
Masahiro describes 4 schemes with 4 segments/TSF:
Original (p_t at 177 MeV): 180+9+4 = 193
A (3/8 DCH from 9 TSFs - p_t at 177 MeV): 180+9+8 = 197
B (5/16 DCH from 8 TSFs - p_t at 226 MeV): 159+8+6 = 173
C (1/4 DCH from 6 TSFs - p_t at 382 MeV): 120+6+8 = 134

Masahiro's schema with 3/4 segments/TSF?

Nice LVDS description.

Possible TSF P1 backplane pinout using B/C for data.