Specifications

VSBC-6862 Rev 1.43

4.11. SCC serial ports

The VSBC-6862 offers four independent serial ports.

In synchronous mode, all four ports have independents RX clock signals, but only SCC1 and SCC2

have TX Clocks signals.

These ports are directly controlled by the Serial Communication Controllers (SCC) included in the

PowerQUICC II. These SCC includes functions like support of many protocols like UART and HDLC, it

contains also FIFO buffers: 32-byte deep, and many more powerful options.

All the four ports are available on four Sub-D-HD-15 connectors on front panel.

The protocols of these ports can be either RS-232, either RS-422/RS-485/V.35.

Switching between these two option can be done through the 'protocolx' jumpers.

The serial ports 1 and 3 have an added function: they can be internally used to synchronize the

internal Baud Rate Generators (BRG) with external clock signal.

4.11.1. RS-232 option

These VSBC-6862 ports are in an standard RS-232 mode.

The following signals are controlled by the PowerQUICC II:

TxD, RxD, TxC, RxC, CTS, RTS, and DCD

All ports support hardware handshaking functions.

DSR signals are pulled-up to VCC to indicate that the board is powered-up.

In DCE mode (to connect a modem), the recommended cable pinout is:

Pin function Sub-D 15, 3 rows, male Sub-D 25, 2 rows, male

Shield 1 1

Transmit Data 2 2

Receive Data 14 3

Request To Send 6 4

Clear To Send 8 5

Data Set Ready 15 6

Ground 7 7

Data Carrier Detect 10 8

Transmit Clock 4 15

Receive Clock 12 17

Data Terminal Ready 9 20

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