Start-Up Options - STMicroelectronics SPC572L series Reference Manual

IEEE 1149.7 Compact JTAG Test Access Port Controller (CJTAG)
60.5.3

Start-up Options

60.5.3.1 Overview
The TAP.7 start-up options are shown in
supported by the CJTAG module is 1149.1 Compliant.
Start-up Option
1149.1 Compliant
1149.1 Compatible
1149.1 Protocol Compatible
Offline-at-Start-up (Dormant)
60.5.3.2 1149.1 Compliant start-up
Start-up behavior with the 1149.1 Compliant behavior start-up option:
•
1149.1-specific behavior / Standard protocol
•
The TAPC finite state machine operated in lock step with the CLTAPC finite state
machine.
•
The TDIC and TDOC pins are present and provide the TDI and TDO function.
• The CLTAPC is coupled at start-up.
With this start-up option, the TAP.7 controller may be programmed and the scan topology
may be interrogated. If the scan topology is known to be the Series Scan Topology at power-
up, the TAP.7 can be operated as though it is a TAP.1.
Type-0 – Type-
Start-up Option
1149.1 Compliant
60.5.4 RSU operation
The RSU uses TCKC and TMSC with the control protocol for configuration control.
60.5.4.1 General Operation
From a very high level, the RSU enables the remainder of the TAP.7 functionality when the
TAP.7 controller is Online and disables the remainder of the TAP.7 functionality otherwise.
The RSU either consumes or discards the TMS(C) information while the TAP.7 controller is
1754/2058
Table 976. Start-up Options
TAP.1 signal functionality, the CLTAPC is coupled
TAP.7 signal functionality, the CLTAPC is decoupled
No, or alternate TDIC/TDOC signal functionality, the CLTAPC is
decoupled.
The TAP.7 controller is offline and awaits synchronization to external tool
operation so as to be placed online, the CLTAPC is decoupled after its
state is moved to Run-Test/Idle
Table 977. Reset values for TAP.7 start-up options
TAP.7 Controller
3 Reset?
online
x Yes
DocID027809 Rev 4
Table 976. The only startup option currently
Description
Default TAP.7 and TAP.7 controller characteristics
CLTAPC
Coupled
Yes
SGC
SCNFMT
Reg. == 1
Yes JScan0
RM0400
Initial TMSC
pin bias
PU