VDD_1V8: 1.8V I/O voltage from HiFive Unleashed to the FMC carrier card.
PG_M2C: Open-drain, active high power good signal to indicate that HiFiveUnleashed has pow-
ered up correctly. The pull up resistor is on the FMC carrier card.
PRSNT_M2C_L: Active-low signal to indicate to the FMC carrier card that HiFive Unleashed is
present. The pull up resistor is on the FMC carrier card.
All other pins are No Connect on the FMC connector.
Low Speed I/O Expansion Connectors
There are two low speed I/O expansion connectors, a 2mm pitch 2x20 and a 2mm pitch 2x10
female headers.
The 2x20 connector follows the 96Boards EE specification expansion connector pinout. All I/O
voltage are at 1.8V.
Net Name
Pin Name
#
#
Pin Name
Net Name
GND
GND
1
2
GND
GND
No Connect
UART0_CTS
3
4
PWR_BTN_N
PWR_BTN_N
UART0_TX
UART0_TXD
5
6
RST_BTN_N
RESET_N
UART0_RX
UART0_RXD
7
8
SPI0_SCLK
QSPI1_SCK
No Connect
UART0_RTS
9
10
SPI0_DIN
QSPI1_DQ1
UART1_TX
UART1_TXD
11
12
SPI0_CS
QSPI1_CS0
UART1_RX
UART1_RXD
13
14
SPI0_DOUT
QSPI1_DQ0
I2C0_SCL
I2C0_SCL
15
16
PCM_FS
No Connect
I2C0_SDA
I2C0_SDA
17
18
PCM_CLK
No Connect
No Connect
I2C1_SCL
19
20
PCM_DO
No Connect
No Connect
I2C1_SDA
21
22
PCM_DI
No Connect
GPIO0
GPIO-A
23
24
GPIO-B
GPIO1
GPIO2
GPIO-C
25
26
GPIO-D
GPIO3
GPIO4
GPIO-E
27
28
GPIO-F
GPIO5
GPIO6
GPIO-G
29
30
GPIO-H
GPIO7
GPIO8
GPIO-I
31
32
GPIO-J
GPIO9
GPIO15
GPIO-K
33
34
GPIO-L
No Connect
VDD_1V8
+1V8
35
36
SYS_DCIN
VDD_DCIN
VDD_5V0
+5V
37
38
SYS_DCIN
VDD_DCIN
GND
GND
39
40
GND
GND
Table 3:
2x20 Low Speed I/O Expansion Connector Pinout
The 2x10 connector has additional low speed I/Os. All I/O voltage are at 1.8V.
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