User's Manual

3. FUNCTIONAL DESCRIPTION
Pin No. Feature Description Default
9 Default/user con-
figuration
When connected to GND, the default configu-
ration is loaded. Otherwise, the user configura-
tion is loaded.
Input
2,4,6 +3.3VDC Pins connected to +3.3VDC. –
8,10 GND Pins connected to ground. –
Table 3: Pin assignment of the GPIO interface
3.2.2.2 RS-422 Interface
The RS-422 interface (see Figure 3 on page 13) is used to access the UART0 interface of the TTE-
Controller ASIC. This interface is used for debugging.
Connector type: 9-pin D-sub female connector. The control interface conforms with the RS-422 standards
and enables connection to one of the COM ports of a PC using a serial 1:1 adapter cable (DB-9 connector
to DB-9 socket). The settings are 115200 baud, 8 data bits, one stop bit, no handshake, no parity.
RS-422 Constraints
The cable length must not exceed 3 m.
Pin No. Signal Name Signal Type
1 RXD− Receive data output
2 RXD+ Receive data output
3 TXD+ Transmit data output
4 TXD− Transmit data output
5 GND Ground
6 CTS− Clear to send
7 CTS+ Clear to send
8 RTS+ Request to send
9 RTS− Request to send
Table 4: Pin assignment of the RS-422 interface
3.2.2.3 SpaceWire Interface
The SpaceWire interface (see Figure 3 on page 13) is a host interface that is used to read and/or write all
registers of the ASIC. The internal end system can be access by using the correct SpaceWire driver.
3.2.2.4 USB Interface
The TTE-Switch Lab Space provides access to the DSU/UART1 interface of the TTE-Controller HiRel
through the USB interface (see Figure 4 on page 14). The USB interface is used for factory firmware
programming.
3.2.2.5 JTAG Interface
The TTE-Switch Lab Space features a standard JTAG interface (see Figure 4 on page 14) on the back
panel. The JTAG connector is used for factory testing.
© TTTech Computertechnik AG 2019. All rights reserved.
Confidential and Proprietary Information
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Document Number:
D-863-M-05-001