TAB to GAB Data Transmission

updated: 22-Oct-04 (for EM Algo Proposal 1)

Index

TAB to GAB Data Streams
Bit Stream Multiplexing on LVDS cable
Transmission Speed

TAB to GAB Data Streams

49 separate 12-bit data streams are transmitted from each TAB to the GAB using LVDS signals on 7-pair cables. These are the same cables/connectors as are used for ADF to TAB data transmission, however, LVDS drivers/receivers embedded in the Altera Stratix chips are used to send signals rather than the Channel Link chips used for ADF-to-TAB transmission and the multiplexing is different.

Definitions of the 49 signal lines and their corresponding positions in the LVDS transmission are given in the table below.

Bit Definitions

Input
bit
LVDS out
[cable.bit] Signal Eta Phi 11 10 09 08 07 06 05 04 03 02 01 00

0 0.0 EM Count S 2 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

1 0.1 EM Count S 3 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

2 0.2 EM Count S 4 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

3 0.3 EM Count S 5 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

4 0.4 EM Count C 2 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

5 0.5 EM Count C 3 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

6 0.6 EM Count C 4 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

7 1.0 EM Count C 5 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

8 1.1 EM Count N 2 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

9 1.2 EM Count N 3 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

10 1.3 EM Count N 4 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

11 1.4 EM Count N 5 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

12 1.5 JET Count S 2 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

13 1.6 JET Count S 3 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

14 2.0 JET Count S 4 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

15 2.1 JET Count S 5 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

16 2.2 JET Count C 2 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

17 2.3 JET Count C 3 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

18 2.4 JET Count C 4 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

19 2.5 JET Count C 5 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

20 2.6 JET Count N 2 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

21 3.0 JET Count N 3 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

22 3.1 JET Count N 4 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

23 3.2 JET Count N 5 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

24 3.3 TAU Count S 2 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

25 3.4 TAU Count S 3 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

26 3.5 TAU Count S 4 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

27 3.6 TAU Count S 5 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

28 4.0 TAU Count C 2 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

29 4.1 TAU Count C 3 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

30 4.2 TAU Count C 4 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

31 4.3 TAU Count C 5 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

32 4.4 TAU Count N 2 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

33 4.5 TAU Count N 3 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

34 4.6 TAU Count N 4 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

35 5.0 TAU Count N 5 Thr-6 Thr-5 Thr-4 Thr-3 Thr-2 Thr-1

36 5.1 EM+H Sum 39-0 5-2 Sum(EM+H Et)

37 5.2 EM+H Sum 39-0 5-2 Sum(EM+H Ex)

38 5.3 EM+H Sum 39-0 5-2 Sum(EM+H Ey)

39 5.4 BC Or --- --- 0 OR of BCs from ADFs

40 5.5 Status --- --- Status Register

41 5.6 Sync --- --- Synch Pulse

42 6.0 Valid --- --- unused

43 6.1 SCL BC --- --- 0 BC calc in TAB

44 6.2 SCL TURN --- --- TURN calc in TAB

45 6.3 Isolation S 5-2 0 5 4 3 2

46 6.4 Isolation C 5-2 0 5 4 3 2

47 6.5 Isolation N 5-2 0 5 4 3 2

48 6.6 Parity --- --- Vertical Parity

Notes

Input bit
Bit stream number for input to serializer in TAB chip 10. Also output bit stream number in corresponding GAB input Stratix.

LVDS out
Cable pairs are numbered 0-6. Each cable-pair carries 7 bits per cycle, corresponding to 7 data-streams. Multiplexing is shown here

Eta
The three eta regions: S=South, C=cent

Phi
This corresponds to the TAB's local phi. Each TAB receives 9 phi-slices (0-8) and finds local maxima in 4 phi-slices (lower-left corners in phi-slices 2-5).

EM Count
This 12-bit count is broken up into 6 2-bit sections, each corresponding to the number of EM objects (0,1,2,>2) in this eta-phi region over a given threshold.

JET Count
This 12-bit count is broken up into 6 2-bit sections, each corresponding to the number of JET objects (0,1,2,>2) in this eta-phi region over a given threshold.

TAU Count
This 12-bit count is broken up into 6 2-bit sections, each corresponding to the number of TAU objects (0,1,2,>2) in this eta-phi region over a given threshold.

EM+H Sum
Et = Sum(eta=0-39,phi=0-9) [Et(EM-TT) + Et(H-TT)]
Ex = Sum(eta=0-39,phi=0-9) [Et(EM-TT) + Et(H-TT)] cos(theta)
Ex = Sum(eta=0-39,phi=0-9) [Et(EM-TT) + Et(H-TT)] sin(theta)

BC Or
OR of Bunch crossing numbers received by TAB chips 0-9 from the ADF.

Status
Bit definitions are given below.

Bits Definition

11 OR of valid data bits from TAB chips 0-9

10 AND of valid data bits from TAB chips 0-9

09 =1 if OR of all BCs received from ADF on TAB chips 0-9 is equal to the internally calculated BC
=0 otherwise

08 all PLLs locked

07..00 OR of status words from TAB chips 0-9

Sync
The frame signal for TAB-to-GAB data transfer. Goes high on the LSB of each 12-bit transfer.

Valid
Goes high on run start (1st TURN signal after an INIT). Enables data capture at the GAB input (sync memory). Only bit 47 is used for this.

SCL BC
Bunch Crossing number calculated internally by TAB.

SCL TURN
Turn number calculated internally by TAB (only lowest 12 bits of 16 are transmitted).

Isolation
Each bit corresponds to the isolation in a specific phi (2,3,4,5) in the S,C,N eta regions. The bit is:

1 if any EM object at this phi, in this eta region passes both the EM-Isolation and EM/HAD-Fraction cuts.
0 otherwise

Three different words are used to reduce latency in incorporating isolation information into the And/Or terms.

Parity
Vertical Parity of words 0-47.

TAB to GAB Bit Stream Multiplexing

	Bit-Stream in Cycle
Cable Pair	0	1	2	3	4	5	6
0	0	1	2	3	4	5	6
1	7	8	9	10	11	12	13
2	14	15	16	17	18	19	20
clk	Clock
3	21	22	23	24	25	26	27
4	28	29	30	31	32	33	34
5	35	36	37	38	39	40	41
6	42	43	44	45	46	47	48

Notes:

Stratix LVDS reference ???
The same cable/connector as used in ADF-to-TAB data transmission is employed in TAB-to-GAB transmission. A diagram of the pinouts of the connector can be found here. Refer to:
- ADF end for TAB connector
- TAB end for GAB connector

TAB to GAB Data Transmission

updated: 22-Oct-04 (for EM Algo Proposal 1)

Index

TAB to GAB Data Streams

Notes

TAB to GAB Bit Stream Multiplexing

Notes:

TAB to GAB Data Transmission Speed

LVDS Clock Speed

Data Transmission Rate

Bits	Definition
11	OR of valid data bits from TAB chips 0-9
10	AND of valid data bits from TAB chips 0-9
09	=1 if OR of all BCs received from ADF on TAB chips 0-9 is equal to the internally calculated BC =0 otherwise
08	all PLLs locked
07..00	OR of status words from TAB chips 0-9