DS33X42DK Maxim Integrated Products, DS33X42DK Datasheet - Page 95

• Manufacturer Part Number: DS33X42DK
• Description: Power Management Modules & Development Tools Ethernet Over PDH Ma PDH Mapping Devices
• Manufacturer: Maxim Integrated Products

Specifications of DS33X42DK

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

When in X.86 mode, the device encapsulates frames with a Start Flag (7Eh), Address, Control and SAPI field,
followed by the frame and a 32-bit FCS. A X
the data does not mimic flags. For transparency processing, 7Eh is translated to 7D 5Eh and 7Dh is translated to
7D 5Dh. Byte stuffing consists of detecting bytes that mimic flag and escape sequence bytes (7Eh and 7Dh), and
replacing the mimic bytes with an escape sequence (7Dh) followed by the mimic byte exclusive 'OR'ed with 20h.
The device will encode the MAC Frame with X.86 / LAPS encapsulation on a complete serial stream if configured
for X.86 mode in the register PP.EMCR. The device provides the following functions:
Received frames are aborted if:
data bytes matching the start/abort flag is replaced with a 2-byte escape sequence. Figure 8-20 shows a frame
Encapsulated in a LAPS Frame. Options for MPLS and VLAN and Q-in-Q information bytes are user configured. In
the receive direction, rate adaptation octets are removed. In the transmit direction, idle code fill is used, and rate
adaptation is not performed. The Encapsulator performs transparency processing or octet stuffing to ensure that
Rev: 063008
________________________________________________ DS33X162/X161/X82/X81/X42/X41/X11/W41/W11
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32 bit FCS
X
Transparency Processing
Rate Adaptation Removal.
If 7d,7E is detected. This is an abort frame sequence in X.86
Invalid FCS is detected
The received frame has less than 6 octets
Control, SAPI and address field are mismatched to the programmed value
Octet 7D and octet other than 5D,5E,7E or DD is detected
43
+1 Scrambling/Descrambling
43
+1 scrambler scrambles the data. Between the Start and Stop flags,
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