Table 979. Scan Format Register Values - STMicroelectronics SPC572L series Reference Manual

IEEE 1149.7 Compact JTAG Test Access Port Controller (CJTAG)
TAPC.7
SCNFMT
Class
00000
T2–T4
00001
00010
T3–T4 00011
01000
01001
T4
01010
01011
1762/2058

Table 979. Scan Format Register Values

JScan0:
– 1149.1 Compliant Operation.
– Requests the coupling of the CLTAPC when the Run-Test/Idle state is reached.
JScan1:
– 1149.1 Compatible Operation
– Requests the decoupling of the CLTAPC when the Run-Test/Idle state is
reached.
JScan2:
– 1149.1 Compatible Operation.
– Requests the coupling or decoupling of the CLTAPC when the Run-Test/Idle
state is reached based on the value of the CACT register
JScan3:
– Non-compatible 1149.1 Operation
– Allows the detection of a T2 TAP.7 controller that is deployed in a Star-4
topology.
– Enables TDOC signal behavior that prevents drive conflicts in a Star-4 Scan
Topology.
– Enables the use of SSDs
OScan0
– Data rate dependent components
– Single TAP.7 communication
– Debug and Test applications
OScan1
– TAP.1 components
– Single/Multi-TAP.7 communication
– Debug and Test applications
OScan2
– TAP.1 components
– No TDI or TDO in non-shift states
– Debug applications
OScan3
– TAP.1 components
– No TDI in non-shift states
– No TDO in any state
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