XRT75R12DIB-F Exar Corporation, XRT75R12DIB-F Datasheet - Page 125

• Manufacturer Part Number: XRT75R12DIB-F
• Description: Peripheral Drivers & Components (PCIs) 12 Channel 3.3V-5V temp -45 to 85C
• Manufacturer: Exar Corporation

Specifications of XRT75R12DIB-F

• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 3.3 V to 5 V
• Package / Case: TBGA-420
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

REV. 1.0.3
Figure 67 presents an illustration which depicts the procedure that is used to synthesize MAJOR PATTERN A
Hence, MAJOR PATTERN A consists of "(63 x 7) + (36 x 5)" = 621 clock pulses. These 621 clock pulses were
delivered over a period of "(63 x 8) + (36 x 6)" = 720 STS-1 (or 51.84MHz) clock periods.
MAJOR PATTERN B
MAJOR PATTERN B consists of three sub or minor-patterns (which we will refer to as "MINOR PATTERNS P1,
P2 and P3).
MINOR PATTERN P1, which is used to partially synthesize MAJOR PATTERN B, is exactly the same "MINOR
PATTERN P1" as was presented above in
to partially synthesize MAJOR PATTERN B, is exactly the same "MINOR PATTERN P2" as was presented in
Figure
MINOR PATTERN P3 (which has yet to be defined) consists of a string of six (6) clock pulses, which contains
no gaps. An illustration of MINOR PATTERN P3 is presented below in Figure 68.
HOW MAJOR PATTERN B IS SYNTHESIZED
MAJOR PATTERN B is created (by the Mapper IC) by:
F
F
IGURE
IGURE
Repeating MINOR PATTERN P1 (e.g., 7 clock pulses, followed by a gap) 63 times.
Upon completion of the 63rd transmission of MINOR PATTERN P1, MINOR PATTERN P2 is transmitted
repeatedly 36 times.
pon completion of the 35th transmission of MINOR PATTERN P2, MINOR PATTERN P3 is transmitted once.
38.
67. I
68. I
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
LLUSTRATION OF
LLUSTRATION OF
P
MINOR PATTERN P3
MINOR PATTERN P1
ROCEDURE WHICH IS USED TO
Repeats 63 Times
1
Figure
2
37. Similarly, the MINOR PATTERN P2, which is also used
3
121
MINOR PATTERN P2
Repeats 36 Times
4
S
YNTHESIZE
5
MAJOR PATTERN A
6
XRT75R12D