Operation - STMicroelectronics SPC572L series Reference Manual

RM0400
(ZBS detection, control-level management, and command generation) is utilized when
either the Standard or Advanced Protocol is used, as these TAP.7 controller attributes are
controlled entirely from the TAPC state progression.
60.7.2

Operation

The conceptual view of the APU operation is shown in
The APU operating states managing the use of the TAP pins and the ancillary (RSU)
services use of the TMSC pin.
APU operating states:
•
BPA – ByPass Active
•
CPA – Change Packet Active
•
SPA – Scan Packet Active
60.7.2.1 BPA
The BPA state allocates the use of the TMSC pin to the Standard Protocol. This state is
entered two ways:
•
As a result of a TAP.7 controller reset when the TAP.7 controller starts up online.
•
From the CPA state when a TAP.7 controller register write specifies the use of the
Standard Protocol.
IEEE 1149.7 Compact JTAG Test Access Port Controller (CJTAG)
Figure 1036. Conceptual view of APU operation
Standard
Protocol
T4
APU
Bypass
Active
BPA
Online Start-up
Offline Start-up
Type 0 –
Reset
Type 4
Logic
Resets
Type-0 | Type-1 | Type-2
DocID027809 Rev 4
Control
Protocol
T4
Change
Packet
Active
CPA
Custom (EOT).
Select
Select, Deselect
Select,
Deselect
Reset
Escape
Sequences
Figure 1036.
Advanced
Protocol
T4
Scan
Packet
Active
SPA
RSU
Custom (EOT)
TCK
TSMC
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