DS21FF44 Maxim Integrated Products, DS21FF44 Datasheet - Page 87

• Manufacturer Part Number: DS21FF44
• Description: IC FRAMER E1 4X4 16CH 300-BGA
• Manufacturer: Maxim Integrated Products

Specifications of DS21FF44

• Controller Type: E1 Framer
• Interface: Parallel/Serial
• Voltage - Supply: 2.97 V ~ 3.63 V
• Current - Supply: 300mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 300-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Figure 21-2. TAP CONTROLLER STATE MACHINE
21.3. INSTRUCTION REGISTER AND INSTRUCTIONS
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 DS21Q44 with their respective operational binary codes are shown in Table 21-1.
Table 21-1. INSTRUCTION CODES FOR THE DS21Q44 IEEE 1149.1
ARCHITECTURE
SAMPLE/PRELOAD
BYPASS
EXTEST
CLAMP
HIGHZ
IDCODE
INSTRUCTION
1
0
Test Logic
Reset
Run Test/
Idle
0
1
0
Boundary Scan
Bypass
Boundary Scan
Boundary Scan
Boundary Scan
Device Identification
1
SELECTED REGISTER
Capture DR
Update DR
1
Pause DR
Select
DR-Scan
Exit2 DR
Shift DR
Exit DR
0
1
0
0
1
0
1
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1
0
0
1
0
1
Capture IR
1
Update IR
Pause IR
Select
IR-Scan
Shift IR
Exit2 IR
Exit IR
0
1
1
1
0
0
0
INSTRUCTION CODE
1
1
0
0
010
111
000
011
100
001
DS21FT44/DS21FF44