FPGA Design Demonstration Board
Hardware User Guide
3-21
To configure from the onboard serial PROM, these switches must be
off. This places the FPGA in master serial mode.
MCLK-Master Clock (SW1-7)
When this switch is on, it connects the XC4003E configuration clock
(pin 73) to the configuration clock on the XC3020A (pin 60). This
connection is used to configure FPGAs in a daisy chain with the
XC4003E at the head.
DOUT-Data Out (SW1–8)
When this switch is on, it connects the XC4003E data out line (pin 72)
to the data in line of the XC3020A. This connection configures FPGAs
in a daisy chain with the XC4003E at the head.
Note
MCLK and DOUT should only be used to configure the FPGAs
in a daisy chain.
XChecker/Parallel Cable III Connector J1
The following table describes the pins and functions of the
XChecker/Parallel Cable III J1 connector.
Table 3-7 XChecker/Parallel Cable III Connector J1
Pin
Name
Function
Pin
Name
Function
J1–1
a
VCC
Su5 V to the
XChecker Cable.
J1–2
RT
Allows XChecker
Cable to trigger a read-
back of the XC3020A.
Connects to XC3020A
pin 26.
J1–3
GND
Supplies ground
reference to
XChecker Cable.
J1–4
RD
Used by XChecker
Cable for readback
data. Connects to
XC3020A pin 25.