MAX16047A 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 MAX16047A/MAX16049A contain a JTAG port that
complies with a subset of the IEEE 1149.1 specification.
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 MAX16047A/
MAX16049A do not support IEEE 1149.1 boundary-scan
functionality. The MAX16047A/MAX16049A contain
extra JTAG instructions and registers not included in the
JTAG specification that provide access to internal mem-
ory. 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
______________________________________________________________________________________ 49