DS3251+ Maxim Integrated Products, DS3251+ Datasheet - Page 42

• Manufacturer Part Number: DS3251+
• Description: IC LIU DS3/E3/STS-1 144-CSBGA
• Manufacturer: Maxim Integrated Products
• Type: Line Interface Units (LIUs)r

Specifications of DS3251+

• Number Of Drivers/receivers: 1/1
• Protocol: DS3
• Voltage - Supply: 3.135 V ~ 3.465 V
• Mounting Type: Surface Mount
• Package / Case: 144-CSBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 16-2. JTAG TAP Controller State Machine
16.3
The instruction register contains a shift register as well as a latched parallel output and is 3 bits in length. When the
TAP controller enters the Shift-IR state, the instruction shift register is connected between JTDI and JTDO. While in
the Shift-IR state, a rising edge on JTCLK with JTMS low shifts data one stage toward the serial output at JTDO. A
rising edge on JTCLK in the Exit1-IR state or the Exit2-IR state with JTMS high moves the controller to the Update-
IR state. The falling edge of that same JTCLK latches the data in the instruction shift register to the instruction
parallel output.
codes.
Table 16-A. JTAG Instruction Codes
SAMPLE/PRELOAD
INSTRUCTIONS
JTAG Instruction Register and Instructions
BYPASS
EXTEST
IDCODE
CLAMP
HIGHZ
1
0
Table 16-A
Test-Logic-Reset
Run-Test/Idle
0
SELECTED REGISTER
shows the instructions supported by the DS325x and their respective operational binary
Device Identification
Boundary Scan
Boundary Scan
1
Bypass
Bypass
Bypass
1
0
Capture-DR
1
Select
DR-Scan
Shift-DR
Pause-DR
Update-DR
Exit1- DR
Exit2-DR
0
0
1
0
1
1
42 of 71
INSTRUCTION CODES
0
1
0
1
0
010
111
000
011
100
001
1
0
Capture-IR
1
Select
IR-Scan
Shift-IR
Exit1-IR
Pause-IR
Exit2-IR
Update-IR
0
0
1
0
1
1
0
1
0
1
0