Siemens ET7 Series Dokumentacja Pobierz pdf (Strona 68)

DSB75 Development Support Board Rev. B1 Hardware Description

Strictly confidential / Released

DSB75_hd_v08 Page 68 of 94 29.09.2005

5 Overview of Switches and Jumpers

This section provides an overview of all switches and jumpers located on DSB75. The exact

location of each switch and jumper is shown in Figure 2 and Figure 43.

5.1 Overview of Switches

Table 30: Overview of switch positions

Function Reference

Switch position 1 Switch position 3

S110 Do not use this position! (reserved for

future use)

Source of VUSB_IN voltage is the DSB75

(5V)

Connects the VUSB_IN line directly to USB

connector X110 (VBUS)

S111

Do not use this position! (reserved for

future use)

Connects the USB_DN line to the USB-

OTG interface (D110, X111)

Connects the USB_DN line directly to USB

connector X110 (D-)

S112 Do not use this position! (reserved for

future use)

Connects the USB_DP line to the USB-

OTG interface (D110, X111)

Connects the USB_DP line directly to USB

connector X110 (D+)

S200 Using RXD0 line as ASC0-RXD

Connects B2B connector signal RXD0 to

the RS-232 transceiver D200 used for

asynchronous serial interface ASC0

Using USC2 line as ASC0-RXD

Connects B2B connector signal USC2 to

the RS-232 transceiver D200 instead of

RXD0

S201 Using TXD0 line as ASC0-TXD

Connects B2B connector signal TXD0 to

the RS-232 transceiver D200 used for

asynchronous serial interface ASC0

Using USC1 line as ASC0-TXD

Connects B2B connector signal USC1 to

the RS-232 transceiver D200 instead of

TXD0

S300 Using TXD1 line as SPI2 chip select

Connects B2B connector signal TXD1 to

the signal SPI2_CS at connector X510

pin 1

Using TXD1 line as ASC1-TXD or SD card

chip select (SPI mode)

Connects B2B connector signal TXD1 to

S301 pin 2

S301 Using TXD1 line as ASC1-TXD

Connects B2B connector signal TXD1 to

the RS-232 transceiver D201 used for

asynchronous serial interface ASC1 if

S300 is in position 3

Using TXD1 line as SD card chip select

(SPI mode)

Connects B2B connector signal TXD1 to

the card reader connector X301 pin 1 if

S300 is in position 3

S302 Using RXD1 line as SPI2 data in

Switch position 2: Connects B2B

connector signal RXD1 to the signal

SPI2_DI at connector X510 pin 3

Using RXD1 line as ASC1-RXD or SD card

data in (SPI mode)

Connects B2B connector signal RXD1 to

S303 pin 2

1 2 ... 63 64 65 66 67 68 69 70 71 72 73 ... 93 94

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