Manual

Rev. 2.1 12
CobraNet™ EV-2
Microcontroller Port Connections:
Port 0: used for the address/data (AD) bus. Once configured, the FPGA latches the lower
address byte from the AD lines.
Port 1: used for several purposes as shown in Table 4 on page 12.
Port 2: upper address bus. Port 2 is output only.
Bit # Name of Signal I/O Description
0 INIT_IO# I Used when configuring the FPGA.
Refer to Xilinx Spartan datasheet
for more detail.
1 PROGRAM# O Used to initiate the FPGA configu-
ration. Refer to Xilinx Spartan
datasheet for more detail.
2 MUTE# I Mute signal from the CM module
3 HEX_DATA_IN O Not used. May be used to concat-
enate settings from other hex
switches.
4 HEX_CLOCK O Used to latch the hex switch val-
ues into a serial shift register.
5 HEX_SHIFT O Used to shift the hex switch values
from the serial shift register.
6 HEX_DATA_OUT O The hex switch value from the
serial shift register appears at this
input.
7 MCU_P17 O This is used for communication
between the FPGA and MCU.
Table 4: Port 1 Signal Descriptions