DS21455 Maxim Integrated Products, DS21455 Datasheet - Page 220

• Manufacturer Part Number: DS21455
• Description: Network Controller & Processor ICs Quad E1-T1-J1 Single -Chip Transceiver (S
• Manufacturer: Maxim Integrated Products

Specifications of DS21455

• Product: Framer
• Number Of Transceivers: 4
• Data Rate: 64 Kbps
• Supply Voltage (max): 3.465 V
• Supply Voltage (min): 3.135 V
• Supply Current (max): 328 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Package / Case: BGA

35.1 Instruction Register
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 will be connected between
JTDI and JTDO. While in the shift-IR state, a rising edge on JTCLK with JTMS LOW will shift the data
one stage towards the serial output at JTDO. A rising edge on JTCLK in the exit1-IR state or the exit2-IR
state with JTMS HIGH will move the controller to the update-IR state. The falling edge of that same
JTCLK will latch the data in the instruction shift register to the instruction parallel output. Instructions
supported by the DS21455/DS21458 and their respective operational binary codes are shown in
Table
Table 35-1. Instruction Codes for IEEE 1149.1 Architecture
SAMPLE/PRELOAD
35-1.
INSTRUCTION
BYPASS
EXTEST
IDCODE
CLAMP
HIGH-Z
SELECTED REGISTER
Device Identification
Boundary Scan
Boundary Scan
Bypass
Bypass
Bypass
220 of 270
INSTRUCTION CODES
010
111
000
011
100
001