HSSTP Description

The High Speed Serial Trace Port [HSSTP] specification uses the connector defined in the HSSTP specification, the Aurora protocol developed by Xilinx and the electrical interface defined by XAUI. Refer to the main HSSTP page covering the standard.

Four dual-row connector sizes are allowed; 22-pins, 34-pins, 46-pins and 70-pins. The 70-pin HST-D70 connector [covered here], provides eight differential transmit pairs, four differential receive pairs, a Vsense line, five JTAG pins, six optional Vendor I/O pins, a Reset line and an optional differential clock line.
Six pairs of reserved pins are called out for this size connector.
Ground pins are also supplied per differential pair, which are longer and mate first.
The Vendor I/O pins are SoC specific and are not defined in the HSSTP specification.
The pinout variations are provided below, shown by number of pins.

HSSTP HST-D70 Pinouts & Signal Assignments

Duplex HST-D70
23 x 2
Pin NumSignal name Signal namePin Num
LatchGND GNDLatch
1TX0+ VIO (Vsense)2
3TX0- TCK4
7TX1+ TDI8
9TX1- TDO10
13RX0+ Vendor I/O 014
15RX0- Vendor I/O 116
17GND Vendor I/O 218
19RX1+ Vendor I/O 320
21RX1- Reset22
25TX2+ CLK+26
27TX2- CLK-28
31TX3+ Vendor I/O 432
33TX3- Vendor I/O 534
37RX2+ Reserved38
39RX2- Reserved40
43RX3+ Reserved44
45RX3- Reserved46
49TX4+ Reserved50
51TX4- Reserved52
55TX5+ Reserved56
57TX5- Reserved58
61TX6+ Reserved62
63TX6- Reserved64
67TX7+ Reserved68
69TX7- Reserved70
LatchGND GNDLatch

HSSTP Connector Pinout Variants

The HST-D70 is the largest connector used by HSSTP.
Although a 75 pin connector is the largest in the series.
Simplex 11 x 2 HSSTP, 4 differential TX lines.
Simplex 17 x 2 HSSTP, 6 differential TX lines.
Simplex 23 x 2 HSSTP, 8 differential TX lines.
Duplex 11 x 2 HSSTP, 2 differential TX lines, 2 differential RX lines.
Duplex 17 x 2 HSSTP, 4 differential TX lines, 2 differential RX lines.
Duplex 23 x 2 HSSTP, 4 differential TX lines, 4 differential RX lines.
Duplex 35 x 2 HSSTP, 8 differential TX lines, 4 differential RX lines.
In this revision the 6 pairs of reserved pins are not to be used.

Duplex Operation
HST-D34 Size
8 Differential Transmit Pairs
4 Differential Receive Pairs
6 Optional Vendors Lines
1 Differential Clock Pair
6 Reserved Pairs

Duplex Transmit/Receive Pair
Duplex Tx/Rx Line Pairs

Samtec Connector:
High-Speed Header
Emulator side: ERM8-70
SoC side: ERF8-70
Partial part number shown.

PC motherboard

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Modified 1/16/12
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