Table 978. Tap.7 Controller Register List (Managed With Commands) - STMicroelectronics SPC572L series Reference Manual

IEEE 1149.7 Compact JTAG Test Access Port Controller (CJTAG)
These commands store a single global register. Global registers manage TAP.7 TAPC
functions that affect the synchronized operation of a TAP.7 TAPC. An example of a global
register is the Scan Format (SCN_FMT) Register used to define the TAPC signal protocol.
A second means of storing all global registers is available. The selection of the TAP.7 TAPC
with the technology selection function stores either the Scan Format register value (short
form) or all global registers (long form). Storing all global registers provides a simple means
to synchronize the values of all global registers when Technology Selection causes a non-
operating TAP.7 TAPC to become operational while other TAPCs are operational.
60.6.2.2 Local
Local registers manage TAP.7 TAPC functions that do not affect the synchronized operation
of TAP.7 TAPCs. Local registers are conditionally stored using TAP.7 controller commands
dedicated for this purpose. These commands provide for changing the value of these
registers one a time with a unique value in a Series Scan Topology based on the TAPC's
position on the scan chain. Local registers are stored with a unique value in a Star Scan
Topology based on a TAPC address assigned to the TAPC.
Registers programmed with commands are described in this section. The CJTAG module
implements all mandatory T4 registers as well as the optional APFC, TRESET, and
RDBACK0 registers.There are 16 mandatory and 10 optional registers that can be grouped
in classes as shown in Read-only – Configuration and register read back..
•
Control – TAP.7 controller behaviors and characteristics.
•
Options – Control of optional functions.
•
Select – Controls the selection of a TAP.7 for Scan and execution of conditional
commands.
•
Read-only – Configuration and register read back.
Register type
Control
Options
Select
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Table 978. TAP.7 controller register list (managed with commands)

Global/
local
Global
Local
Local
DocID027809 Rev 4
Register
Width
mnemonic
1
ECL
1 SUSPEND
1 ZBSINH
5 SCNFMT
1 SSDE
2 DLYC
2 RDYC
1 TRESET
2 APFC
1 CGM
1 SGC
1 SEDGE
Name
Exit Control Level
Suspend
ZBS Detect Inhibit
Scan Format
SSD Enable
Delay control
Ready Control
Test Reset
Aux. Pin Func. Cntl.
Cond. Group Member
Scan Group Candidate
Sampling Edge
RM0400