AP32536 HSTCU, HSTCE High-Speed Tool Connector
USB Type-C and Samtec ERF8-based tool connector
About this document
Scope and purpose
Infineon’s AURIX™ TC3xx and TC4xx devices have a standardized set of tool interfaces (DAP, DAPE, trigger pins, AGBT, SGBT, SGMII). This document specifies a standardized pinning for all these interfaces for the cost effective and small USB Type-C connector. This pinning is not compatible to regular USB devices, but ensures that there is no damage for any combination of regular USB hardware, HSTCU (High Speed Tool Connector USB-C) boards and tool HW.
Intended audience
System designers, in particular PCB designers and tool vendors.
Introduction
The High Speed Tool Connector ERF8 (HSTCE) defines a similar pinning for the Samtec ERF8 connector. HSTCE can be used for a tool cable adaptor board, but as well directly on the target board.
Features
Small size and footprint
Designed for up to 10 Gbps high-speed signals
Different variants offered by several manufacturers
Cost effective
Long term availability of USB Type-C connector parts
Can be used also for a subset like DAP only
No additional components needed
Protection scheme for both sides if a regular USB device is plugged in
Hot plug support due to GND first connection
Note: The connector cannot be used with a regular USB cable. This avoids all kind of electrical issues and allows that a maximum number of the connector pins is usable for debug purposes.
Connector pinning
Pin | USB | AURIX™ TC3xx | AURIX™ TC4xx | Remark |
|---|---|---|---|---|
A1 | GND | GND | _ | |
A2 | TX1+ | AGBTTXP | SGBTTXP/SGMIITXP | _ |
A3 | TX1- | AGBTTXN | SGBTTXN/SGMIITXN | |
A4 | VBUS | Not connected | _ | |
A5 | CC1 | PORST | Pull-up on target board is assumed | |
A6 | D+ | DAP2/TGI3/TGO3 or TDO | TGO3 is recommended as trigger trace pin | |
A7 | D- | (DAP3/TGI2/TGO2/DAPE1 or TDI) | Optional for 2 nd trigger pin, DAPE or JTAG TGO2 is the alternative trigger trace pin | |
A8 | SBU1 | DAP0 or TCK | _ | |
A9 | VBUS | Not connected | _ | |
A10 | RX2- | Not connected | SGMIIRXN | Optional for Ethernet tool communication |
A11 | RX2+ | Not connected | SGMIIRXP | |
A12 | GND | GND | _ | |
B1 | GND | GND | _ | |
B2 | TX2+ | Not connected | Not connected | Future use for 2 nd TX Future use for 2 nd TX |
B3 | TX2- | Not connected | Not connected | |
B4 | VBUS | Not connected | _ | |
B5 | CC2 | VDDP of DAP/DAPE/JTAG pins | V REF for DAP/DAPE | |
B6 | D+ | (Auxiliary signal for e.g. WATCHDOG_DISABLE) | Optional signal with uncritical behavior. TESTMODE pin for Infineon internal boards. | |
B7 | D- | DAPE0 or TRST | DAP4/DAPE0 or TRST | |
B8 | SBU2 | DAP1 or TMS | _ | |
B9 | VBUS | Not connected | _ | |
B10 | RX1- | AGBTCLKN | SGBT_CLKN | SGBT: Most devices use an internal clock. AGBT: External clock is always needed. |
B11 | RX1+ | AGBTCLKP | SGBT_CLKP | |
B12 | GND | Connected to PORST. (Not connected on tool side) | Enforce AURIX™ reset state (no pin driven) if a regular USB Type-C cable is connected. Enables also a straightforward connector orientation detection. | |
Uncritical behavior is a pin with input characteristics after reset and with optional a weak pull resistor. This state shall only be changed under control of the connected tool.
Protection for wrongly plugged tools or USB cables
shows the signals between the connector and AURIX™ which ensure the protection of a wrongly plugged tool or any other USB-C compliant cable or device. In case of a wrong plugging pin B12 will be forced to GND, which will force the low active reset (PORST) of AURIX™. In reset state all AURIX™ signals which are on the connector are in high impedance state.
Figure 1. Device protection scheme
Connector orientation detection by the tool
Target presence is detectable by the tool with CC1/CC2. For a powered board at least
V
REF
must be high. The PORST pin will be usually also high (PORST inactive). Excluding errors in the board design, the connector orientation is always detectable under these conditions:
Board is powered (
V
REF
is present)
PORST on CC1 is forced low, when the orientation is wrong
The second condition is enforced by the described (
Table 1
,
Figure 1
) connection between B12 and and the AURIX™ PORST pin on the target board.
CC1 | CC2 | Orientation | Comment |
|---|---|---|---|
L | L | Unknown | Target board is not powered |
L | H | Correct | V REF on CC2, PORST active |
H | H | Correct | V REF on CC2, PORST inactive. This is the normal operation mode. |
H | L | Wrong | V REF on CC1, PORST active is forced because B12 is connected to GND. |
Auxiliary power connector and mounting holes
There are two use cases for the power connector:
Tool supplies the SBGT PHY of the target device
Target board supplies tool frontend board
The first use case is described in section
VDDPHPHYx supply for SGBT/SGMII by the tool
.
Pin | Name | Description |
|---|---|---|
1 | GND | GND |
2 | VPHY | Supply from tool hardware for VDDPHPHYx on the target board. |
3 | VTHB | 3.3 V supply from the target board for the tool hardware board. |
4 | _ | Reserved for Infineon internal usage. Do not connect. |
Note: Do not connect VPHY on the target board, if VDDPHPHYx is supplied by the target board.
For a mechanical robust mounting of tool hardware to a target board two positions for 3 mm screws with spacing rollers are defined (
Figure 2
). A tool HW will always support the position between the two connectors. The second position is optional for larger tool HW boards.
Figure 2. Connector and mounting hole geometry on the target board
Figure 3. Example for an adaptor board from SGMII to Ethernet
Target board
TRST pin circuitry
TRST must not have a strong pull-up on the target board. Otherwise an accidentally connected USB device will be damaged when the D- differential I/O pin on A7/B7 is connected with a low resistive connection to 3.3 V or even 5 V. A board without an external pull-up fulfills this requirement since starting with the AURIX™ TC3xx generation the TRST pin has a chip internal pull-up.
PORST pin circuitry
A tool using DAPE must be able to sense the actual PORST pin level at the device to ensure that TRST is high at PORST release. The DAPE0 clock pin is overlaid to the TRST pin and, only by sensing the PORST pin, a DAPE tool can ensure that TRST is high at PORST release under all conditions. If TRST/DAPE0 is low at PORST release, JTAG will be enabled and no DAP/DAPE communication is possible.
A board with a direct connection between the connector PORST pin and the device PORST pin fulfills this requirement.
VDDPHPHYx supply for SGBT/SGMII by the tool
If there is no supply for VDDPHPHYx on the target board, this supply can be provided by the tool. It only needs to be ensured by a 1k resistor to GND on the target board, that this supply is not floating when e.g. the tool is unplugged. Also, a buffer capacitor on the target board is required.
Note: All VDDPHPHYx supplies of the device need to be connected to the same rail.
Labels Not4USB and A1
It is recommended to show the connector orientation by marking the connector side with the A1 pin on the board. This can be done with the label “A1” or a dot. For boards with many potentially unexperienced users it is recommended to label the connector with “Not4USB”.
Standard adaptors
HSTCU to DAP connector adaptor
Please refer to appnote AP24003 for the definition of the DAP connector.
DAP | Function | HSTCU | Comment |
|---|---|---|---|
1 | VREF | B5 (CC2) | _ |
2 | DAP1 | B8 (SBU2) | _ |
3, 5, 7, 9 | GND | A1, A12, B1, (GND) | B12 is intentionally not connected |
4 | DAP0 | A8 (SBU1) | _ |
6 | DAP2/TGI3/TGO3 | A6 (D+) | _ |
8 | DAP3/TGI2/TGO2 | A7 (D-) | Note not TRST (DAPEN) |
10 | RESET/PORST | A5 (CC1) | _ |
The adaptor leaves all other HSTCU pins open, except B7 (TRST). This pin is connected to a 4k pull-up to
V
REF
for ensuring DAP interface enabling for AURIX™ TC3xx devices. AURIX™ TC4xx devices have a TRST pin with an internal pull-up, which means the DAP interface is enabled per default if this pin is left open.
The GND pins are all connected together except B12. This enforces an active PORST, when the connector orientation is wrong and so this situation is safe and easily detectable even without a tool.
HSTCU to DAP+DAPE connector adaptor
This adapter allows to connect two regular DAP connector tools in parallel via the DAP and the DAPE interface.
DAP/DAPE | Function | HSTCU | Comment |
|---|---|---|---|
1 | VREF | B5 (CC2) | _ |
2 | DAP1 DAPE1 | B8 (SBU2) A7 (D-) | _ |
3, 5, 7, 9 | GND | A1, A12, B1, (GND) | B12 is intentionally not connected |
4 | DAP0 DAPE0 (TRST) | A8 (SBU1) B7 (D-) | _ |
6 | DAP2/TGI3/TGO3 Not connected | A6 (D+) _ | _ |
8 | Not connected Auxiliary signal | _ B6 (D+) | Difference to DAP connector adaptor |
10 | RESET/PORST | A5 (CC1) | _ |
The adaptor leaves all other HSTCU pins open. The GND pins are all connected together except B12. This enforces an active PORST, when the connector orientation is wrong and so this situation is safe and easily detectable even without a tool.
For mechanical stability it is recommended for this adaptor to use the standard mounting hole with a spacing roller and a screw.
For AURIX™ TC3xx devices it is strongly recommended to connect the dedicated DAPE0/1 pins from the center ball matrix to HSTCU and hardwire TRST to high for DAP enabling (without connecting it to HSTCU!). This ensures a robust tool behavior even if only one tool is connected.
HSTCU to HSTCE (ERF8) connector adaptor
The ERF8 connector was standardized as Aurora connector (according to Application Note AP32186) for AURIX™ TC2xx and TC3xx Emulation Devices.
For AURIX™ TC4xx devices with SGBT it can be used as well with minor changes. For instance, if the ERF8 connector is preferred over the USB C-type connector for temperature range reasons.
defines the High-Speed Trace Connector with ERF8 (HSTCE) pinning. This HSTCE pinning is used for the adaptor but can be used on a target board as well.
HSTCE | Function | HSTCU | Comment |
|---|---|---|---|
1 | SGBTTXP/SGMIITXP | A2 | _ |
3 | SGBTTXN/SGMIITXN | A3 | _ |
5, 11, 17 | GND | A1, A12, B1 | B12 is intentionally not connected |
7 | TX+ | B2 | Future use for 2 nd TX |
9 | TX- | B3 | |
13, 15, 20 | _ | _ | Not connected on HSTCE |
19, 21 | (VPHY) | _ | Optional VDDPHPHYx supply for target board |
2 | VDDP | B5 | _ |
4 | DAP0 or TCK | A8 | _ |
6 | DAP1 or TMS | B8 | _ |
8 | DAP3 or TDI | A7 | _ |
10 | DAP2 or TDO | A6 | _ |
12 | DAP4 or TRST | B7 | _ |
14 | SGBT_CLKP | B11 | _ |
16 | SGBT_CLKN | B10 | _ |
18 | (Auxiliary signal) | B6 | _ |
22 | PORST | A5 | _ |
_ | _ | A4, A9, A10, A11, B4, B9, B12 | Not connected on HSTCU |
Note: VPHY is not connected to HSTCU. The use case is when the HSTCE connector is directly on a target board. Please consider the hints for VPHY from section Auxiliary power connector and mounting holes for the target board design.
Revision history
Document version | Date of release | Description of changes |
|---|---|---|
V1.0 | 2021-04-26 | Initial version |
V1.1 | 2021-08-24 | Added hint for WATCHDOG_DISABLE signal in Table 1 |
V1.2 | 2022-09-09 | Changed document classification |
V1.3 | 2025-07-07 | Template update |