ds26504 Maxim Integrated Products, Inc., ds26504 Datasheet - Page 102

• Manufacturer Part Number: ds26504
• Description: Ds26504 T1/e1/j1/64kcc Bits Element
• Manufacturer: Maxim Integrated Products, Inc.

17. JTAG BOUNDARY SCAN ARCHITECTURE AND TEST ACCESS PORT
The DS26504 supports the standard IEEE 1149.1 instruction codes SAMPLE/PRELOAD, BYPASS, and
EXTEST. Optional public instructions included are HIGHZ, CLAMP, and IDCODE. The DS26504
contains the following as required by IEEE 1149.1 Standard Test Access Port and Boundary Scan
Architecture:
Details on Boundary Scan Architecture and the Test Access Port can be found in IEEE 1149.1-1990,
IEEE 1149.1a-1993, and IEEE 1149.1b-1994.
The Test Access Port has the necessary interface pins: JTRST, JTCLK, JTMS, JTDI, and JTDO. See the
pin descriptions for details.
Figure 17-1. JTAG Functional Block Diagram
Test Access Port (TAP)
TAP Controller
Instruction Register
Bypass Register
Boundary Scan Register
Device Identification Register
10k Ω
V
DD
JTDI
10k Ω
V
DD
JTMS
TEST ACCESS PORT
BOUNDRY SCAN
IDENTIFICATION
INSTRUCTION
CONTROLLER
REGISTER
REGISTER
REGISTER
REGISTER
BYPASS
JTCLK
102 of 128
10k Ω
V
DD
JTRST
SELECT
OUTPUT ENABLE
MUX
JTDO