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XC-1 Hardware Manual (1.3.2)
8 USB Connector [H and J]
The XC-1 is powered directly from a host PC using a USB connector. The 5V voltage
is converted by the on-board regulator to the 1V and 3V3 supplies used by the
components.
The USB connector can also be used to load and debug code on all of the XS1-G4's
processors. The USB connector provides JTAG control, system reset, processor debug,
and two UART links. The layout of the USB connector is shown below.
On power on, the XS1-G4 boots from the on-board flash memory. The XS1-G4 can
then be put into JTAG mode by the PC, which then boots another program.
No UART hardware is provided. Instead, two UART pins are mapped to ports, as
shown in the table below.
If a UART is required, it can be implemented in software by sampling and driving
these ports at the required rate. The connector performs a UART-to-USB conversion
on these pins, presenting a virtual COM port to the PC that can be interfaced via a
terminal emulator.
9 20MHz Crystal Oscillator [I]
The XS1-G4 is clocked at 20MHz by a crystal oscillator on the card. Each processor is
clocked at 400MHz, the I/O ports at 100MHz, by an on-chip phase-locked loop (PLL).
Downloaded from
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electronic components distributor
Pin
Port
Processor
1b
0
X0D23 P1H0 PORT_UART_TX
X1D24 P1I0
PORT_UART_RX
www.xmos.com
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