DS26502 Maxim Integrated Products, DS26502 Datasheet - Page 98

• Manufacturer Part Number: DS26502
• Description: T1/E1/J1/64KCC BITS Element
• Manufacturer: Maxim Integrated Products

17. JTAG BOUNDARY SCAN ARCHITECTURE AND TEST ACCESS PORT
The DS26502 supports the standard IEEE 1149.1 instruction codes SAMPLE/PRELOAD, BYPASS, and
EXTEST. Optional public instructions included are HIGHZ, CLAMP, and IDCODE. The DS26502
contains the following as required by IEEE 1149.1 Standard Test Access Port and Boundary Scan
Architecture:
§ Test Access Port (TAP)
§ TAP Controller
§ Instruction Register
§ Bypass Register
§ Boundary Scan Register
§ Device Identification Register
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
10kW
V
DD
JTDI
10kW
V
DD
JTMS
TEST ACCESS PORT
BOUNDRY SCAN
IDENTIFICATION
INSTRUCTION
CONTROLLER
REGISTER
REGISTER
REGISTER
REGISTER
BYPASS
JTCLK
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10kW
V
DD
JTRST
SELECT
OUTPUT ENABLE
DS26502 T1/E1/J1/64KCC BITS Element
MUX
JTDO