DS33R41 Maxim Integrated Products, DS33R41 Datasheet - Page 329

• Manufacturer Part Number: DS33R41
• Description: Network Controller & Processor ICs Inverse-Multiplexing Ethernet Mapper wit
• Manufacturer: Maxim Integrated Products

DS33R41 Inverse-Multiplexing Ethernet Mapper with Quad Integrated T1/E1/J1 Transceivers
15.2.9 Update-DR
A falling edge on JTCLKn while in the Update-DR state will latch the data from the shift register path of the test
registers into the data output latches. This prevents changes at the parallel output due to changes in the shift
register.
15.2.10 Select-IR-Scan
All test registers retain their previous state. The instruction register will remain unchanged during this state. With
JTMSn LOW, a rising edge on JTCLKn moves the controller into the Capture-IR state and will initiate a scan
sequence for the instruction register. JTMSn HIGH during a rising edge on JTCLKn puts the controller back into
the Test-Logic-Reset state.
15.2.11 Capture-IR
The Capture-IR state is used to load the shift register in the instruction register with a fixed value. This value is
loaded on the rising edge of JTCLKn. If JTMSn is HIGH on the rising edge of JTCLKn, the controller will enter the
Exit1-IR state. If JTMSn is LOW on the rising edge of JTCLKn, the controller will enter the Shift-IR state.
15.2.12 Shift-IR
In this state, the shift register in the instruction register is connected between JTDIn and JTDOn and shifts data
one stage for every rising edge of JTCLKn towards the serial output. The parallel register, as well as all test
registers, remains at their previous states. A rising edge on JTCLKn with JTMSn HIGH will move the controller to
the Exit1-IR state. A rising edge on JTCLKn with JTMSn LOW will keep the controller in the Shift-IR state while
moving data one stage thorough the instruction shift register.
15.2.13 Exit1-IR
A rising edge on JTCLKn with JTMSn LOW will put the controller in the Pause-IR state. If JTMSn is HIGH on the
rising edge of JTCLKn, the controller will enter the Update-IR state and terminate the scanning process.
15.2.14 Pause-IR
Shifting of the instruction shift register is halted temporarily. With JTMSn HIGH, a rising edge on JTCLKn will put
the controller in the Exit2-IR state. The controller will remain in the Pause-IR state if JTMSn is LOW during a rising
edge on JTCLKn.
15.2.15 Exit2-IR
A rising edge on JTCLKn with JTMSn LOW will put the controller in the Update-IR state. The controller will loop
back to Shift-IR if JTMSn is HIGH during a rising edge of JTCLKn in this state.
15.2.16 Update-IR
The instruction code shifted into the instruction shift register is latched into the parallel output on the falling edge of
JTCLKn as the controller enters this state. Once latched, this instruction becomes the current instruction. A rising
edge on JTCLKn with JTMSn held low will put the controller in the Run-Test-Idle state. With JTMSn HIGH, the
controller will enter the Select-DR-Scan state.
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