Router Scan Chain - Texas Instruments SimpleLink CC2620 Technical Reference Manual

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5.3.2.8 Connect Register
This register guards the device from noise, hot connection of an emulator cable, or accidental scan by a
misconfigured scan controller. This register reduces the chances of accidentally engaging debug functions
due to noise or accidental scans. Refer to
Bit Field
7 Write Enable
6–4 Reserved
3–0 ConnectKey

5.3.3 ROUTER Scan Chain

This register accesses all TAP linking and control registers. The scan chain is 32-bits long. Refer to
Table 5-12 for more information.
Bit Field
31 Write Enable
30–28 Block Select
SWCU117C – February 2015 – Revised September 2015
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Figure 5-10
Figure 5-10. Connect Register
Bit 7
Write
TDI
Access W
Reset 0
Table 5-11. Connect Register
Width Type
1 W
3 R
4 R/W
Figure 5-11. ROUTER DR Scan Chain
Bit 31 30
TDI Write Enable /
Block Select
Write Failure
Access R/W W
Table 5-12. ROUTER DR Scan Chain Description
Width Type
1 W
3 R/W
Copyright © 2015, Texas Instruments Incorporated
and Table 5-11 for more details.
6 4 3 0
Reserved ConnectKey
TDO
R R/W
0 b0110
Reset Description
Must be 1 to write the Connect Key. A value of 0 is a read.
0
When read, a value of 0 is returned.
0 Reserved
When this field holds the key code of 1001, the scan controller
is considered to be connected. All other values are in the not-
0110
connected state. In this state, only a limited number of IR
instructions are valid.
28 27 24 23
Register Number Register Value
W R/W
Reset Description
On scan-in:
0: Only a read is performed.
1: A write to the specified register is performed.
On scan-out:
If the previous scan resulted in a write to a ROUTER addressed
register, then when bit 31 is scanned out during the next trip
through the Shift DR state, it indicates whether the previous
write succeeded. If 1, the previous write failed. If 0, the previous
write was successful.
A write to a debug or test secondary TAP control and status
0
register may fail for a number of reasons including:
• ICEPick is in the disconnected state.
• The TapPresent bit is 0, which indicates that a TAP does
not exist at this location.
• The TapEnable bit is 0, which indicates that security or
other reasons are currently preventing access to this TAP.
• A previous programming of the ResetControl or
ReleaseFromWIR bits has not been processed yet.
Block select:
000: ICEPick Control (see
000
001: Test TAP Linking Control Block (see
010: Debug TAP Linking Control Block (see
011–111: Reserved
0
TDO
Section 5.3.4.1)
Section 5.3.4.2)
Section 5.3.4.3)
JTAG Interface
ICEPick
403