GOWIN DK START GW1NS-LV4CQN48C7I6 V1.1, Schematic Manual, Page: 8 / 16

GW1NS & GW1NSR & GW1NSE & GW1NSER Series of FPGA
Products Schematic Manual
UG292-1.0E
www.gowinsemi.com.en 8
(
15
)
Signal Description
Table 7 Signal Description
Name I/O Description
MODE2
I, internal weak
pull-up
GowinCONFIG mode selection pin.
MODE1
I, internal weak
pull-up
GowinCONFIG modes selection pin.
MODE0
I, internal weak
pull-up
GowinCONFIG mode selection pin.
Mode Selection
Table 8 Mode Selection
Configuration Mode MODE[2:0] Description
JTAG XXX
External Host configure FPGA products of
LittleBee
®
Family via JTAG interface.
GowinCONFIG
AUTO
BOOT
000
FPGA reads data from embedded Flash
for configuration
SSPI 001
External Host configure FPGA products of
LittleBee
®
Family via SPI interface.
MSPI 010
FPGA as Master, FPGA reads data from
external Flash (or other devices) via the
SPI interface for configuration.
.
DUAL
BOOT
110
FPGA reads data from external Flash first
and if the external Flash fails, it reads from
the internal Flash.
SERIAL 101
External Host configure FPGA products of
LittleBee
®
Family via DIN interface.
CPU 111
External Host configure FPGA products of
LittleBee
®
Family via DBUS interface.
JTAGSEL_N
Overview
JTAGSEL_N is JTAG mode selection signal. If the JTAG pin is set to
GPIO in Gowin software, the JTAG pin changes to GPIO after the device is
powered on to configure successfully. If JTAG configuration fails, you can
recover by pulling down JTAGSEL_N. If you do not set JTAG multiplexing,
the JTAG configuration function is always available.
Signal Description
Table 9 Signal Description
Pin Name I/O Description
JTAGSEL_N
I, internal weak
pull-up Change JTAG pin from GPIO to
configuration pin, active-low
Note!