ECM1900

SYZYGY Ports

Port Summary

The BRK1900 provides 7 SYZYGY ports. A summary of details of each port is listed in the table below.

PORT	VIO GROUP	VIO RAnge	TYPE	BRK1900 REFDES	BANK	Bank TYpe	I2C Address
PORT A	1	1.2 – 3.3V	STD	J8	I/O 87 & 88	HD	`0110 000x`
PORT B	2	1.2 – 1.8 V	STD	J9	I/O 68	HP	`0110 001x`
PORT C	3	1.2 – 1.8 V	STD	J11	I/O 67	HP	`0110 010x`
PORT D	4	1.2 – 1.8 V	STD	J1	I/O 28	HP	`0110 011x`
PORT E	3	1.2 – 1.8 V	TXR4	J6	GTH 225 (REFCLK 1) I/O 67	GTH + HP	`0110 100x`
PORT F	4	1.2 – 1.8 V	TXR4	J7	GTH 224 (REFCLK 1) I/O 28	GTH + HP	`0110 101x`
PORT G _{(Rev BXX+)}	2	1.2 – 1.8 V	TXR4	J5	GTH 223 (REFCLK 1) I/O 68	GTH + HP	`0110 110x`

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 length as been matched on the BRK8370 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 STD ports are routed with a mix of single-ended and differential connections as appropriate for the connected SYZYGY I/O, with the exception of PORT A. Because PORT A connects to an HD bank with very limited differential options, it is routed entirely as single-ended.

SYZYGY Compatibility Table

PARAMETER	PORT A	PORT B	PORT C	PORT D	PORT E	PORT F	PORT G (BXX+)
Total 5V Supply Current	2 A
Total 3.3V Supply Current	4 A
Port Groups	Group 1	Group 2	Group 3	Group 4	Group 3	Group 4	Group 2
Port Type	Standard [1, 2]	Standard	Standard	Standard	Transceiver (TXR4)	Transceiver (TXR4)	Transceiver (TXR4)
Bank Type	HD	HP	HP	HP	GTH + HP	GTH + HP	GTH + HP
VIO Supply Voltage Range	1.2 – 3.3 V	1.2 – 1.8 V
Total VIO Supply Current	1 A (VCCO_87_88)	1 A Shared (VCCO_68)	1 A Shared (VCCO_67)	1 A Shared (VCCO_28)	1 A Shared (VCCO_67)	1 A Shared (VCCO_28)	1 A Shared (VCCO_68)
Port Spacing	Double-Wide Spacing		Double-Wide Spacing		Double-Wide Spacing
I/O per Port	28 total (0 DP)	28 total (8 DP)	28 total (8 DP)	28 total (8 DP)	10 total	10 total	10 total
Length Matching	3552 – 3559 mils	3288 – 3296 mils DP: 5 mils max within pair	3864 – 3867 mils DP: 5 mils max within pair	2384 – 2391 mils DP: 5 mils max within pair	Single-Ended: 5063 – 5065 mils 5 mils max within pair	Single-Ended: 5745 mils 5 mils max within pair	Single-Ended: 6767 mils 5 mils max within pair

The I/O on this port do not support differential standards because of limitations on HD banks.
The C2P and P2C clock pins on these ports do not support differential standards because of limitations on HD banks.
The port signal lengths are based on PCB revision BXX

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