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Publication No. IMP2B-0HH/5
Functional Description 39
3.20 JTAG
The JTAG interface is provided by a Firecron JTS06Bu Scanbridge. This allows the
boundary scan path to be partitioned into smaller chains, providing easier fault
diagnosis and faster Flash programming. The device supports six Test Access Ports,
which are allocated as follows:
Table 3-27 JTAG Chains
TAP Number Device
1
Processor (3.3 V to 2.5 V converters on-card)
2
PMC site
3
MV64560 Discovery V Host Bridge
4
Ethernet PHYs
5
EPLD
6
Accelerated Flash Programming
The input to the Scanbridge is driven from the CompactPCI JTAG signals as defined
by PICMG2.0, Rev 3.0.
NOTE
In PICMG 2.0, Rev 3.0, it is recommended that the Backplane JTAG signals are not used. When no
jumper is fitted across link
, the IMP2B does not drive these pins and so these signals may be
used for any other purpose allocated to them.
A separate COP header (
on the back of the board) is provided to support JTAG
processor emulation and can be accessed using the IMP2AJTAG test adaptor.
CAUTION
When using the COP header, ensure that the JTAG Scanbridge is disabled (link
LINK