9. JTAG Interface > JTAG Device Identification Number
202
Tsi578 User Manual
June 6, 2016
Integrated Device Technology
www.idt.com
9.2
JTAG Device Identification Number
The JTAG device ID number for the Tsi578 is 0x20573167
9.3
JTAG Register Access Details
The Tsi578 has the capability to read and write registers through the JTAG interface.
The JTAG Interface has the ability to access registers in order to debug issues that can affect RapidIO
register accesses. Register access through the JTAG Interface can also be used in normal mode to do
extensive read and write accesses on the performance registers without slowing down the normal
traffic in the device or during initialization.
A user defined command is used to enable the read and write capabilities of the interface. The
command is in the IEEE 1149.1 Instruction Register (IR) in the Tsi578.
•
IEEE Register Access Command (IRAC)
9.3.1
Format
The format used to access the registers is shown in
. The address shown in the
figure is the RapidIO offset.
Figure 44: Register Access From JTAG - Serial Data In
Figure 45: Register Access From JTAG - Serial Data Out
Prior to using the IEEE Register Access Command feature, the part must be reset by driving
TRST_b low.
Ti
p
There must be IEEE 1149.1 capability on the board to use the IEEE 1149.1 register access
feature.
JT_TDI
Address [20:0]
R/W Data [31:0]
Error
Reserved [63:0]
Ready
Address [20:0]
R/W Data [31:0]
Error
Ready
JT_TDO
