SYZYGY Ports

Port Summary

The BRK8350 provides 6 SYZYGY ports. A summary of details of each port is listed in the table below.

The XEM8350 firmware is configured to connect up to 16 SYZYGY ports, the maximum allowed in the SYZYGY standard. These ports are designated SYZYGY 0 to SYZYGY 15. The BRK8350 provides physical access to 6 of those possible SYZYGY ports. The BRK8350’s SYZYGY ports are designated PORT A to PORT F. See the table below for the mapping between these virtual and physical SYZYGY ports on the BRK8350. The SYZYGY port number for a physical port is determined by the Geographical Address resistor connected to the port, as defined in the SYZYGY DNA Specification.

Revision HXX
FXX and Previous

BRK8350 PORT	XEM8350 PORT	VIO GROUP	TYPE	BRK8350 REFDES	BANK
PORT A	SYZYGY 8	2	STD	J5	I/O 24
PORT B	SYZYGY 9	2	STD	J4	I/O 45
PORT C	SYZYGY 0	1	STD	J1	I/O 48
PORT D	SYZYGY 1	1	STD	J2	I/O 47
PORT E	SYZYGY 2	1	TXR4	J23	GTH 128 (REFCLK 0) I/O 46
PORT F	SYZYGY 3	1	TXR4	J8	GTH 225 (REFCLK 1) I/O 46

BRK8350 PORT	XEM8350 PORT	VIO GROUP	TYPE	BRK8350 REFDES	BANK
PORT A	SYZYGY 0	1	STD	J1	I/O 48
PORT B	SYZYGY 1	1	STD	J2	I/O 47
PORT C	SYZYGY 8	2	STD	J4	I/O 45
PORT D	SYZYGY 9	2	STD	J5	I/O 24
PORT E	SYZYGY 10	2	TXR4	J8	GTH 226 (REFCLK 0) I/O 25
PORT F	SYZYGY 11	2	TXR4	J23	GTH 225 (REFCLK 1) I/O 25

Configuration of the XEM8350 connected TXR4 ports requires the XEM8350_SZG_TXR4_PORTS device setting to specify which ports are TXR4 type. This requires placing a 1 in bit positions that correspond to the connected TXR4 ports.

The BRK8350 has two TXR4 port (Port E and F) which uses the address resistor associated with location SYZYGY 2 and 3 (10 and 11 on revision FXX). To configure the port as a TXR4 port, set bits 2 and 3 to 1 in the XEM8350_SZG_TXR4_PORTS device setting.

For BRK8350 revision FXX and older this value should be set to 0x0C00.

For BRK8350 revision HXX and newer this value should be set to 0x00C0.

See Device Settings for more information.

Peripheral Mounting

SYZYGY peripherals can be mechanically connected together using the carrier and peripheral mounting holes. Below are some suggested mounting hardware options. The Standard Hardware mounting kit is available from the accessories section of our store.

PART	SUPPLIER	PART NUMBER	QUANTITY PER PORT
5mm Unthreaded Standoff	McMaster-Carr	94669A098	2
Pan Head Phillips 10mm Bolt	McMaster-Carr	92000A106	2
Hex Nut	McMaster-Carr	91828A113	2

STANDARD HARDWARE

PART	SUPPLIER	PART NUMBER	QUANTITY PER PORT
Male-to-Female 5mm Standoff	McMaster-Carr	93655A001	2
Pan Head Phillips 4mm Bolt	McMaster-Carr	92000A102	2
Thumb Nut	McMaster-Carr	96445A320	2

QUICK SWAP HARDWARE

Impedance and Length Matching

Single-ended fabric I/O is routed to the SYZYGY ports with 50Ω characteristic impedance. Differential fabric I/O is routed to the SYZYGY ports as 100Ω differential impedance. Fabric I/O routing as been matched on the BRK8350 to each SYZYGY port as much as possible. Differential pair routing has been matched to at least 5 mils within pairs. This matching, and the length values in the SYZYGY Compatibility Table below, represent the traces from mezzanine connectors to the SYZYGY ports.

SYZYGY Compatibility Table

Revision HXX
FXX
EXX

PARAMETER	PORT A	PORT B	PORT C	PORT D	PORT E	PORT F
Total 5V Supply Current	2 A
Total 3.3V Supply Current	2 A
Port Groups	Group 2: A, B		Group 1: C, D, E, F
Port Type	Standard	Standard	Standard	Standard	Transceiver (TXR4) [1]	Transceiver (TXR4)
Bank Type	HP	HP	HP	HP	GTH + HP	GTH + HP
VIO Supply Voltage Range	0.95 – 1.8 V		0.95 – 1.8 V
Total VIO Supply Current	2 A		2 A
Port Spacing	Double-Wide Spacing		Double-Wide Spacing		Double-Wide Spacing
I/O per Port	28 total (8 DP)	28 total (8 DP)	28 total (8 DP)	28 total (8 DP)	10 total	10 total
Length Matching	2425.1 – 2425.4 mills DP: 5 mils max within pair	3532 – 3533 mills DP: 5 mils max within pair	2944 – 2946 mills DP: 5 mils max within pair	2674 – 2678 mills DP: 5 mils max within pair	I/O: 2757 – 2760 mills Transceivers: 2190 – 3117 mills 5 mils max within pair	I/O: 4336.7 – 4337 mills Transceivers: 5829 – 7197 mills 5 mils max within pair

PORT E uses Quad 128 which is not adjacent to a PCIE hard block and so it is not compatible with the SZG-PCIEX4 peripheral.

PARAMETER	PORT A	PORT B	PORT C	PORT D	PORT E	PORT F
Total 5V Supply Current	2 A
Total 3.3V Supply Current	2 A
Port Groups	Group 1: A, B		Group 2: C, D, E, F
Port Type	Standard	Standard	Standard	Standard	Transceiver (TXR4) [1]	Transceiver (TXR4)
Bank Type	HP	HP	HP	HP	GTH + HP	GTH + HP
VIO Supply Voltage Range	0.95 – 1.8 V		0.95 – 1.8 V
Total VIO Supply Current	2 A		2 A
Port Spacing	Double-Wide Spacing		Double-Wide Spacing		Double-Wide Spacing
I/O per Port	28 total (8 DP)	28 total (8 DP)	28 total (8 DP)	28 total (8 DP)	10 total	10 total
Length Matching	1563 – 2111 mils DP: 5 mils max within pair	1441 – 2426 mils DP: 5 mils max within pair	2101 – 2709 mils DP: 5 mils max within pair	1256 – 2252 mils DP: 5 mils max within pair	I/O: 1931 – 2524 mils Transceivers: 2791 – 4083 mils 5 mils max within pair	I/O: 3253 – 3883 mils Transceivers: 3990 – 4975 mils 5 mils max within pair

PARAMETER	PORT A	PORT B	PORT C	PORT D	PORT E	PORT F
Total 5V Supply Current	2 A
Total 3.3V Supply Current	2 A
Port Groups	Group 1: A, B		Group 2: C, D, E, F
Port Type	Standard	Standard	Standard	Standard	Transceiver (TXR4) [1]	Transceiver (TXR4)
Bank Type	HP	HP	HP	HP	GTH + HP	GTH + HP
VIO Supply Voltage Range	0.95 – 1.8 V		0.95 – 1.8 V
Total VIO Supply Current	2 A		2 A
Port Spacing	Double-Wide Spacing		Double-Wide Spacing		Double-Wide Spacing
I/O per Port	28 total (8 DP)	28 total (8 DP)	28 total (8 DP)	28 total (8 DP)	10 total	10 total
Length Matching	1563 – 2111 mils DP: 5 mils max within pair	1441 – 2426 mils DP: 5 mils max within pair	2101 – 2709 mils DP: 5 mils max within pair	1256 – 2252 mils DP: 5 mils max within pair	I/O: 1931 – 2524 mils Transceivers: 2865 – 3952 mils 5 mils max within pair	I/O: 3253 – 3883 mils Transceivers: 3978 – 4806 mils 5 mils max within pair