MAX16046A Datasheet, PDF (55/71 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 MAX16046A/MAX16048A contain a JTAG port
that complies with a subset of the IEEE 1149.1 specifi-
cation. 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 MAX16046A/
MAX16048A do not support IEEE 1149.1 boundary-
scan functionality. The MAX16046A/MAX16048A con-
tain extra JTAG instructions and registers not included
in the JTAG specification that provide access to inter-
nal 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
______________________________________________________________________________________ 55