Motorola PowerQUICC II MPC8280 Series Reference Manual page 1050

ATM Layer Statistics
CAM data in field:
0
Figure 31-20. External CAM Address in UDC Extended Address Mode
31.8 ATM Layer Statistics
ATM layer statistics can be used to identify problems, such as the line-bit error rate, that
affect the UNI performance. Statistics are kept in three 16-bit wrap-around counters:
• UTOPIA error dropped cells count—Counts cells discarded due to UTOPIA errors:
Rx parity errors and short or long cells.
• Misinserted dropped cell count—Counts cells discarded due to address look-up
failure.
• CRC10 error dropped cell count—Counts cells discarded due to CRC10 errors.
(ABR only).
Counters are implemented in the dual-port RAM for each PHY device. The counters of
each PHY are located in the UNI statistics table, described in Section 31.10.7, "UNI
Statistics Table."
31.9 ATM-to-TDM Interworking
The MPC8280 supports ATM and TDM interworking. The MCCs and their corresponding
SIs handle the TDM data processing. (See Chapter 29, "Multi-Channel Controllers
(MCCs)," and Chapter 15, "Serial Interface with Time-Slot Assigner.") The ATM
controller processes the ATM data.
Possible interworking applications include the following:
• Circuit emulation service (CES)
• Carrying voice over ATM
• Multiplexing several low speed services, such as voice and data, onto one ATM
connection
Data forwarding between the ATM controller and an MCC can be done in two ways:
• Core intervention. When an MCC receive buffer is full and its RxBD is closed, the
MCC interrupts the core. The core copies the MCC's receive buffer pointer to an
ATM TxBD and sets the ready bit (TxBD[R]). Similarly, when an ATM receive
buffer is full and its RxBD is closed, the core services the ATM controller's interrupt
by copying the ATM receive buffer pointer to an MCC TxBD and setting TxBD[R].
This mode is useful when additional core processing is required.
31-36
Freescale Semiconductor, Inc.
16-bit 4-bit
UEAD PHY addr
15 16
MPC8280 PowerQUICC II Family Reference Manual
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12-bit
VPI
19 20 31 32
16-bit
VCI
47
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