Texas Instruments SimpleLink CC2620 Technical Reference Manual page 401

Zigbee rf4ce wireless mcu simplelink cc13 series; simplelink cc26 series

Data Shift Register

is the register used to shift bits between the ICEPick TDI and TDO. This register is 32-bits

wide. The data shift register has multiple shift in points to facilitate shifts on the instruction path and

several of the data paths.

When asked to shift, 1 bit is shifted from each bit into the next lower bit. A new value is shifted in from TDI

while the least significant bit is shifted out to TDO. The shift register has several insertion points based on

the current TAP state or value in the instruction register.

Instruction Register

This register contains the current TAP instruction. The ICEPick IR is 6-bits wide.

for valid IR opcodes.

Bypass Register

This register is a 1-bit register. Whatever value is scanned in TDI is preserved and scanned out of TDO

one TCK cycle later.

Device Identification Register

This register allows the manufacturer, part number, and version of the device to be determined through

the TAP. The device identification register is scanned in response to the IDCODE instruction.

IDCODE has three fields: version, part number, and manufacturer.

The contents of this register are replicated to a device configuration area which is memory mapped. Refer

to FCFG1:ICEPICK_DEVICE_ID in

SWCU117C – February 2015 – Revised September 2015

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Figure 5-4. Data Shift Register

Router or ID Shift

Broad side load and store, serial shift

Figure 5-5. Instruction Register

Figure 5-6. Bypass Register

Figure 5-7. Device Identification Register

VERSION[3:0]

PARTNUM[15:0]

Section 9.2.1.50

Instruction Shift

Connection Shift

Manufacturer

000 0001 0111b. 1

for details of this register.

JTAG Interface

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