
Data Sheet
June 2001
DSP16410B Digital Signal Processor
60
Agere Systems—Proprietary
Use pursuant to Company instructions
Agere Systems Inc.
4 Hardware Architecture
(continued)
4.12 JTAG Test Port (JTAG
0—1
)
(continued)
4.12.3 Multiprocessor JTAG Connections
The DSP16410B has two JTAG ports, one for each
DSP16000 core. The user can daisy-chain these ports
onto the same scan chain, potentially with other
DSP16410B devices, or interface to each JTAG port
individually for debugging. If multiple JTAG ports are
interfaced together on the same scan chain, TMS and
TCK are broadcast to all DSPs in the scan chain. TDI
of the first JTAG port in the chain is then connected to
TDI of the TCS connector on the user’s board, TDO of
the first JTAG port is connected to TDI of the next JTAG
port in the chain, and so on. TDO of the last JTAG port
in the chain is then tied to TDO of the TCS
connector. If more than six JTAG ports are in the same
scan chain, TMS and TCK
must
be buffered to ensure
compatibility with t155 and t156 (See
Table 190 on
page 282
). In the typical application, the user’s board
ties the DSP16410B JTAG reset signals, TRST0N and
TRST1N, to the device reset, RSTN.
Figure 17
illus-
trates a typical daisy-chain connection between the
TCS hardware and the two cores of a single
DSP16410B.
Note: CORE0 is DSP1 on the scan chain and CORE1 is DSP2 on the scan chain. For multiple DSP16410B devices on a single scan chain,
maintain the CORE0-to-CORE1 daisy chain.
Figure 17. Typical Multiprocessor JTAG Connection with Single Scan Chain
JCS/TCS
TDO
TCK
TMS
TDI
TCK0
TMS0
TDI0
TDO0
TCK1
TMS1
TDI1
TDO1
CORE1
CORE0
RESET
TRST0N
TRST1N
RSTN
DSP16410B