1 Slice Card Overview
I N T H I S C H A P T E R
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1.1
Pack Contents
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One XA-SK-UART-8 Slice Card
1.2
RS232 Capability
8 Uarts are provided on two 8-bit ports. An RS232 signalling level optn is provided
by four SP3222EB RS232 transceivers, each handling 4 tx or 4 rx lines. The EN_N
enable pins of the transceivers are controlled by populating a jumper between pins
25 and 26 of header J3. If that jumper is populated then RS232 is disabled and TTL
inputs/outputs for all uarts can be accessed via J3, otherwise RS232 inputs/outputs
for all uarts can be accessed via J4.
1.3
Fixed Oscillator
A 1.8432 MHZ oscillator provides a fixed master reference frequency which is
input into the XCore on a 1-bit port to allow the sc_multi_uart transmitter module
software to obtain precise timing against standard UART baud rates.
1.4
DB9 Connector
Uart channel 0 (RX and TX) can be accessed either via pins 1 and 2 of J3 or J4,
or via the DB9 connector. In the latter case, RS232 mode needs to be enabled as
above.
REV A