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STR912FAW42 Datasheet(PDF) 28 Page - STMicroelectronics

Part # STR912FAW42
Description  ARM966E-S??16/32-Bit Flash MCU with Ethernet, USB, CAN, AC motor control, 4 timers, ADC, RTC, DMA
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STR912FAW42 Datasheet(HTML) 28 Page - STMicroelectronics

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Functional overview
STR91xFAx3x, STR91xFAx4x
28/101
Figure 3.
JTAG chaining inside the STR91xFA
3.15.1
In-system-programming
The JTAG interface is used to program or erase all memory areas of the STR91xFA device.
The pin RESET_INn must be asserted during ISP to prevent the CPU from fetching invalid
instructions while the Flash memories are being programmed.
Note that the 32 bytes of OTP memory locations cannot be erased by any means once
programmed by JTAG ISP or the CPU.
3.15.2
Boundary scan
Standard JTAG boundary scan testing compliant with IEEE-1149.1 is available on the
majority of pins of the STR91xFA for circuit board test during manufacture of the end
product. STR91xFA pins that are not serviced by boundary scan are the following:
●
JTAG pins JTCK, JTMS, JTDI, JTDO, JTRSTn, JRTCK
●
Oscillator input pins X1_CPU, X2_CPU, X1_RTC, X2_RTC
●
Tamper detect input pin TAMPER_IN (128-pin and 144-pin packages only)
3.15.3
CPU debug
The ARM966E-S CPU core has standard ARM EmbeddedICE-RT logic, allowing the
STR91xFA to be debugged through the JTAG interface. This provides advanced debugging
features making it easier to develop application firmware, operating systems, and the
hardware itself. Debugging requires that an external host computer, running debug software,
is connected to the STR91xFA target system via hardware which converts the stream of
debug data and commands from the host system’s protocol (USB, Ethernet, etc.) to the
JTDI
JTMS
JTCK
JTDO
TDI
TMS
TCK
TDO
TDO
TMS TCK
TDI
JTAG TAP CONTROLLER #1
JTAG TAP CONTROLLER #3
BURST FLASH
MEMORY DIE
ARM966ES DIE
BOUNDARY SCAN
STR91xx
JTRSTn
TRST
TDI
TMS
TCK
TDO
JTAG TAP CONTROLLER #2
CPU DEBUG
TRST
JRTCK
TRST
MAIN FLASH
SECONDARY FLASH
JTAG
Instruction
register length:
5 bits for TAP #1
4 bits for TAP #2
JTAG
Instruction
register length
is 8 bits


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