MAX16047_09 Datasheet, PDF (49/61 Pages) Maxim Integrated Products – 12-Channel/8-Channel EEPROM-Programmable System Managers with Nonvolatile Fault Registers

12-Channel/8-Channel EEPROM-Programmable
System Managers with Nonvolatile Fault Registers
JTAG Serial Interface
The MAX16047/MAX16049 contain a JTAG port that
complies with a subset of the IEEE 1149.1 specifica-
tion. Either the I²C or the JTAG interface may be used
to access internal memory; however, only one interface
is allowed to run at a time. The MAX16047/MAX16049
do not support IEEE 1149.1 boundary-scan functionali-
ty. The MAX16047/MAX16049 contain extra JTAG
instructions and registers not included in the JTAG
specification that provide access to internal memory.
The extra instructions include LOAD ADDRESS, WRITE,
READ, REBOOT, SAVE, and USERCODE.
REGISTERS
AND EEPROM
V_DB
R_PU
TDI
TMS
TCK
MEMORY WRITE REGISTER
[LENGTH = 8 BITS]
MEMORY READ REGISTER
[LENGTH = 8 BITS]
MEMORY ADDRESS REGISTER
[LENGTH = 8 BITS]
USER CODE REGISTER
[LENGTH = 32 BITS]
IDENTIFICATION REGISTER
[LENGTH = 32 BITS]
BYPASS REGISTER
[LENGTH = 1 BIT]
INSTRUCTION REGISTER
[LENGTH = 5 BITS]
TEST ACCESS PORT
(TAP) CONTROLLER
Figure 13. JTAG Block Diagram
01100
01011
01010
01001
01000
00111
00110
MUX 1
00101
00100
00011
00000
11111
COMMAND
DECODER
01100
01011
01010
01001
01000
00111
RSTEEPADD
SETEEPADD
RSTEXTRAM
SETEXTRAM
SAVE
REBOOT
MUX 2
TDO
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