DS31412N Maxim Integrated Products, DS31412N Datasheet - Page 70

• Manufacturer Part Number: DS31412N
• Description: IC 12CH DS3/3 FRAMER 349-BGA
• Manufacturer: Maxim Integrated Products

Specifications of DS31412N

• Controller Type: DS3/E3 Framer
• Interface: LIU
• Voltage - Supply: 3.135 V ~ 3.465 V
• Current - Supply: 960mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 349-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9. JTAG INFORMATION
The DS3146, DS3148, and DS31412 support the standard instruction codes SAMPLE/PRELOAD, BYPASS, and
EXTEST. Optional public instructions included are HIGHZ, CLAMP, and IDCODE. See the JTAG block diagram in
Figure
Test Access Port (TAP) and Boundary Scan Architecture:
The Test Access Port has the necessary interface pins, namely JTCLK, JTDI, JTDO, and JTMS, and the optional
JTRST input. Details on these pins can be found in Section 5.6. Refer to IEEE 1149.1-1990, IEEE 1149.1a-1993,
and IEEE 1149.1b-1994 for details about the Boundary Scan Architecture and the Test Access Port.
Figure 9-1. JTAG Block Diagram
9.1 JTAG TAP Controller State Machine
This section covers the operation of the TAP controller state machine. See
states described below. The TAP controller is a finite state machine that responds to the logic level at JTMS on the
rising edge of JTCLK.
Test-Logic-Reset. When JTRST is changed from low to high, the TAP controller starts in the Test-Logic-Reset
state, and the instruction register is loaded with the IDCODE instruction. All system logic and I/O pads on the
device operate normally.
Run-Test-Idle. Run-Test-Idle is used between scan operations or during specific tests. The instruction register and
test register remain idle.
9-1. The device contains the following items, which meet the requirements set by the IEEE 1149.1 Standard
Test Access Port (TAP)
TAP Controller
Instruction Register
10kW
JTDI
10kW
JTMS
IDENTIFICATION
TEST ACCESS PORT
INSTRUCTION
BOUNDARY
REGISTER
REGISTER
REGISTER
REGISTER
CONTROLLER
BYPASS
SCAN
JTCLK
70 of 89
10kW
JTRST
SELECT
TRI-STATE
Bypass Register
Boundary Scan Register
Device Identification Register
JTDO
Figure 9-2
for details on each of the