56 SBC347A 3U VPX Single Board Computer
Publication No. 500-9300527837-000 Rev. A.0
5.19 JTAG
5.19.1 Boundary Scan
The SBC347A provides JTAG boundary scan facilities for all IEEE 1149.1 and
IEEE 1149.6-compliant devices. Access to the main chain is via the VPX backplane
, and access to the CPU and PCH chain is via the test access card
(TAC). The JTAG structure is shown below.
Figure 5-7 JTAG Chains
5.19.2 Processor Debug Port
The SBC347A provides access to the debug port on the processor via the TAC.
This includes a Samtec 60-way SH-030-01-L-D-A connector in accordance with
Intel recommendations, and conforms to the Intel eXtended Debug Port (XDP)
standard pinout, allowing probes from various vendors to be used.
A TAC is available if required (part number SBC326TST-11). Contact Abaco for
ordering information.
JTAG
Header
XDP
Header
Lattice
JTAG
Header
VPX
P0
CPU
X540
SmartFusion2
PCH
MUX
0 = CPU only, for XDP
1 = CPU + PCH, for boundary scan
Test Card
SBC326TST
Level-shift
1.05V/3.3V
Level-shift
3.3V - 1.8V
Level-shift
1.8V - 3.3V
0
0
1
1
MUX
MUX