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XC-1 Hardware Manual (1.3.2) 2/17
1 Introduction
The XC-1 is an Event-Driven Processor development board based on the XMOS XS1-
G4. It comprises a single XS1-G4, 16 user-configurable LEDs, four push-buttons,
a speaker, JTAG and serial interfaces, and a through-hole prototyping area for
connecting external components. The XC-1 is powered directly from a host PC using
a mini-USB cable.
The diagram below shows the layout of the main components on the card:
AG
CC
C
C
C
B
BB
B
B
B
B
B
B
B
B B
F
E E
EE
D
D
D
D
AXS1-G4 Device
BTwelve Red/Green User LEDs
CFour Green User LEDs
DFour Push-Button Switches
EFour I/O Expansion Areas
H
I
J
FPrototyping Area
GSpeaker
HMini USB-B Connector
I20MHz Crystal Oscillator
JUSB 2.0 to JTAG
The XC-1 Development Kit also includes a USB cable for powering and booting the
device from a PC. The card is fitted with four plastic feet, which are useful for building
bigger prototyping systems.
The following sections in this document provide a detailed description of these
components.
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2 XS1-G4 Device [A]
The XC-1 provides a single four core XS1-G4 device in a 512BGA package. Each
XCore is programmable and comprises an event-driven multi-threaded processor
with tightly integrated general purpose I/O pins and 64 KBytes of on-chip RAM. The
pins on XCore0 and XCore2 are brought out of the package and connected to the
card’s components as follows:
Processor 0
•Twelve red/green and four green LEDs
•Four push-button switches
•Speaker
Processor 2
•Three 16-way I/O expansion headers (24 I/O bits)
•One 16-way I/O expansion headers (16 I/O bits)
The processors have ports that are directly connected to the I/O pins. Examples of
how to write software that interfaces over these ports with the XC-1 components is
provided in a separate tutorial [1].
3 User-configurable LEDs [B and C]
The XC-1 has 16 user-configurable LEDs. Four of green LEDs are positioned next
to the four push-buttons (collectively referred to as button-LEDs) and contain green
diodes. The other 12 LEDs are positioned around the XS1-G4 in a circle (collectively
referred to as clock-LEDs) and contain red/green diodes. A Roman numeral is printed
next to each LED. Each of the LEDs can be driven by software. The layout of the LEDs
is shown on the following page.
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XII
VI
A
B
C
D
VII
VIII
IX
XI
V
IIII
III
II
I
X
G
G
G
G
To reduce the number of pins required for the 12 clock-LEDs, the LED anodes are
connected to three 4-bit ports (4A, 4B and 4C) on processor 0 and the cathodes are
connected to two 1-bit ports (1E for green, 1F for red) that are active high.
The schematic for the clock-LEDs is shown below
I II III IIII V VI VII VIII IX X XI XII
X0D2
PORT_CLOCKLED_0 PORT_CLOCKLED_0PORT_CLOCKLED_0
X0D3 X0D8 X0D9 X0D4 X0D5 X0D6 X0D7 X0D14X0D15 X0D20 X0D21
PORT_CLOCKLED_SELG
X0D12
PORT_CLOCKLED_SELR
X0D13
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PORT_CLOCKLED_SELR PORT_CLOCKLED_SELG Colour
0 0 Off
0 1 Green
1 0 Red
1 1 Red
To get yellow, alternate green/red in 4:1 ratio
The clock LED pins are mapped to ports as described in the table below:
Pin Port Processor
1b 4b 0
X0D2 P4A0 PORT_CLOCKLED_0 [IIII]
X0D3 P4A1 PORT_CLOCKLED_0 [V]
X0D4 P4B0 PORT_CLOCKLED_1 [VIII]
X0D5 P4B1 PORT_CLOCKLED_1 [IX]
X0D6 P4B2 PORT_CLOCKLED_1 [X]
X0D7 P4B3 PORT_CLOCKLED_1 [XI]
X0D8 P4A2 PORT_CLOCKLED_0 [VI]
X0D9 P4A3 PORT_CLOCKLED_0 [VII]
X0D12 P1E0 PORT_CLOCKLED_SELG
X0D13 P1F0 PORT_CLOCKLED_SELR
X0D14 P4C0 PORT_CLOCKLED_2 [XII]
X0D15 P4C1 PORT_CLOCKLED_2 [I]
X0D20 P4C2 PORT_CLOCKLED_2 [II]
X0D21 P4C3 PORT_CLOCKLED_2 [III]
The button LED pins are mapped to ports as described in the table below:
Pin Port Processor
8b 0
X0D40 P8D4 PORT_BUTTON_LED [A]
X0D41 P8D5 PORT_BUTTON_LED [B]
X0D42 P8D6 PORT_BUTTON_LED [C]
X0D43 P8D7 PORT_BUTTON_LED [D]
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4 Push-Button Switches [D]
The XC-1 provides four push-button switches whose states can be sampled at any
time by software. Pushing a button results in a 0 signal, unpushed the signal is 1.
The layout of the push-buttons is shown below.
A
B
C
D
The push buttons are connected to four pins, which are mapped to ports as described
in the table below.
Pin Port Processor
4b 8b 0
X0D16 P4D0 P8B2 PORT_BUTTON [A]
X0D17 P4D1 P8B3 PORT_BUTTON [B]
X0D18 P4D2 P8B4 PORT_BUTTON [C]
X0D19 P4D3 P8B5 PORT_BUTTON [D]
Each pin can be configured either as a 4-bit port or an 8-bit port. The configuration
is determined by the set of port initialisers used in the software [2].
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5 I/O Expansion Areas [E]
The I/O pins of processor 2 are brought out to expansion areas on both sides of the
card. These areas have 0.1” pitch plated through holes and are suitable for use with
IDC headers. To provide maximum flexibility, no headers are fitted, allowing the
most suitable type to be selected depending on the design. The routing of the I/O
and power pins in the expansion headers is shown below.
X D1
X D3
X D5
GND
X2D7
X D9
X D11
GND
X2D0
X2 2D2
X2 2D4
3V3
X2D6
X2 2D8
X2 2D10
5V
1 2
15 16
2
X D25
X D27
X D29
GND
X2D31
X D33
X D35
GND
X2D13
X2D15
X2D17
GND
X2D19
GND
X2D12
X2D14
X2D16
3V3
X2D18
X2D20X D212
X D232X2D22
5V
2 1
16 15
2 1
16 15
X2D37
X2D39
X2D41
GND
X2D43
NC
NC
X2D36
X2D38
X2D40
3V3
X2D42
NC
NC
5V
GND X2D24
X2 2D26
X2 2D28
3V3
X2D30
X2 2D32
X2 2D34
5V
1 2
15 16
2
X2PortA
X2PortB
X2PortC
X2PortD
Three of the expansion headers provide a bank of 12 I/O pins, while the fourth
provides a bank of eight I/O pins. The pins are mapped to the ports as described in
the table on the next page.
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Pin Port Processor
1b 4b 8b 16b 2
X2D0 P1A0
X2PortA
X2D1 P1B0
X2D2 P4A0 P8A0 P16A0
X2D3 P4A1 P8A1 P16A1
X2D4 P4B0 P8A2 P16A2
X2D5 P4B1 P8A3 P16A3
X2D6 P4B2 P8A4 P16A4
X2D7 P4B3 P8A5 P16A5
X2D8 P4A2 P8A6 P16A6
X2D9 P4A3 P8A7 P16A7
X2D10 P1C0
X2D11 P1D0
X2D12 P1E0
X2PortB
X2D13 P1F0
X2D14 P4C0 P8B0 P16A8
X2D15 P4C1 P8B1 P16A9
X2D16 P4D0 P8B2 P16A10
X2D17 P4D1 P8B3 P16A11
X2D18 P4D2 P8B4 P16A12
X2D19 P4D3 P8B5 P16A13
X2D20 P4C2 P8B6 P16A14
X2D21 P4C3 P8B7 P16A15
X2D22 P1G0
X2D23 P1H0
X2D24 P1E0
X2PortC
X2D25 P1F0
X2D26 P4E0 P8C0 P16B0
X2D27 P4E1 P8C1 P16B1
X2D28 P4F0 P8C2 P16B2
X2D29 P4F1 P8C3 P16B3
X2D30 P4F2 P8C4 P16B4
X2D31 P4F3 P8C5 P16B5
X2D32 P4E2 P8C6 P16B6
X2D33 P4E3 P8C7 P16B7
X2D34 P1K0
X2D35 P1L0
X2D36 P1M0 P8D0 P16B8
X2PortD
X2D37 P1N0 P8D1 P16B9
X2D38 P1O0 P8D2 P16B10
X2D39 P1P0 P8D3 P16B11
X2D40 P8D4 P16B12
X2D41 P8D5 P16B13
X2D42 P8D6 P16B14
X2D43 P8D7 P16B15
Eight pins from each bank can be configured as either two 4-bit ports or a single
8-bit port. Two of the expansion headers can alternatively be used together as a
single 16-bit port.
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5.1 XMOS Link Configuration
Some of the I/O pins on the expansion header can be configured as XMOS Links. The
mapping of XMOS Links to the headers is shown in the table below.
Header 2/A
Pin XMOS Link 2
2 bit 5 bit
X2D0
X2D1 XLA4 O
X2D2 XLA3 O
X2D3 XLA2 O
X2D4 XLA1 O XLA1 O
X2D5 XLA0 O XLA0 O
X2D6 XLA0 I XLA0 I
X2D7 XLA1 I XLA1 I
X2D8 XLA2 I
X2D9 XLA3 I
X2D10 XLA4 I
X2D11
Header 2/B
Pin XMOS Link 2
2 bit 5 bit
X2D12
X2D13 XLB4 O
X2D14 XLB3 O
X2D15 XLB2 O
X2D16 XLB1 O XLB1 O
X2D17 XLB0 O XLB0 O
X2D18 XLB0 I XLB0 I
X2D19 XLB1 I XLB1 I
X2D20 XLB2 I
X2D21 XLB3 I
X2D22 XLB4 I
X2D23
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6 Prototyping Area [F]
The XC-1 provides a 0.1” pitch plated through hole area for adding components to
the card.
The routing of I/O and power pins in the prototyping area is shown below.
3V3
X0D39
GND
GND
X0D38
X0D37
X0D36
X0D33
X0D32
X0D31
X0D30
X0D29
X0D28
X0D27
X0D26
X0D11
X0D10
X0D1
X0D0
5V
The prototyping area provides a bank of 16 I/O pins, which are mapped to the ports
on processor 0 as described in the table on the following page.
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