Register Descriptions
MU9C RCP Family
JTAG
For detailed information on JTAG testing, refer to the
IEEE Standard Test Access Port and Boundary-scan
Architecture IEEE Std. 1149.1-1990 and 1149.1a-1993.
The MU9C RCP Instruction register is 3 bits long, giving
eight possible JTAG instructions. The least significant bit
is clocked in first. The JTAG instructions are as follows:
JTAG Function
EXTEST
Instruction
000
RESERVED
RESERVED
CLAMP
001
010
011
IDCODE
100
INTEST
101
SAMPLE/PRELOAD
BYPASS
110
111
The MU9C4K64 IDCode is: X4000133H The
MU9C8K64 IDCode is: XAC08133H (X is the four-bit
revision code).
To achieve full JTAG chain in the MCM, the TDO’s of
each device should be connected to the TDI’s of the
subsequent device in the multi-chip module. Thus system
designer should connect TDO_1 to TDI_2; TDO2_to
TDI_3; and TDO3_to TDI_4. Pins TDI and TDO are the
entry and exit points of the chain respectively.
BSDL files are available; check the MUSIC
Semiconductors website or contact MUSIC Technical
Support.
Rev. 8.04
17
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