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ML623 Board User Guide
UG724 (v1.1) September 15, 2010
Chapter 1:
ML623 Board Features and Operation
System ACE Controller
[
Figure 1-2
, callout
6
]
The onboard System ACE controller (U25) allows storage of multiple configuration files on
a CompactFlash card. These configuration files can be used to program the FPGA. The
CompactFlash card connects to the CompactFlash card connector (U24) located directly
below the System ACE controller on the back side of the board.
System ACE Controller Reset
[
Figure 1-2
, callout
7
]
Pressing push button SW2 (RESET) resets the System ACE controller. Reset is an
active-Low input.
Configuration Address DIP Switches
[
Figure 1-2
, callout
8
]
DIP switch SW3 selects one of the eight configuration bitstream addresses in the
CompactFlash memory card. The switch settings for selecting each address are shown in
Table 1-3
.
JTAG Isolation Jumpers
[
Figure 1-2
, callout
9
]
The group of four 2-pin headers shown in
Figure 1-6
provide the option to isolate the
FPGA JTAG interface from the System ACE controller by removing the shunts from all
four headers. The FPGA JTAG interface can also be driven directly from these headers by
attaching the flying wire JTAG cable to pin 2 of each header.
Figure 1-6
shows a more
detailed representation of the isolation jumpers as part of the broader JTAG chain in
Figure 1-5
.
Table 1-3:
SW3 DIP Switch Configuration
Address
ADR2
ADR1
ADR0
0
O
(1)
O
O
1
O
O
C
(2)
2
O
C
O
3
O
C
C
4
C
O
O
5
C
O
C
6
C
C
O
7
C
C
C
Notes:
1. O indicates the open switch position (logic 0).
2. C indicates the closed switch position (logic 1).
