MPC8280 datasheet(989/1386 Pages) FREESCALE

989 / 1386 page

ATM Controller and AAL0, AAL1, and AAL5

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

31-29

described in Section 31.10.2.3.3, “AAL0 Protocol-Specific TCT.” Prepare the OAM F4/F5 flow cell and

insert it in an AAL0 TxBD. Finally, issue a ATM TRANSMIT command to send the OAM cell. For multiple

PHYs, use several AAL0 channels—each PHY should have one transmit raw cell queue that is associated

with its scheduling table.

A series of OAM cells can be sent using one ATM TRANSMIT command by creating a table of AAL0

TxBDs. If the channel’s TCT[AVCF] (auto VC off) is set, the transmitter automatically removes it from

the APC (that is, it does not generate periodic transmit requests for this channel after all AAL0 BDs are

processed).

31.6.6

Performance Monitoring

A connection’s performance is monitored by inspecting blocks of cells (delimited by forward monitoring

cells) sent between connection or segment endpoints. Each FMC contains statistics about the immediately

preceding block of cells. When an endpoint receives an FMC, it adds the statistics generated locally across

the same block to produce a backward reporting cell (BRC), which is then returned to the opposite

endpoint.

The MPC8280 can run up to 64 bidirectional block tests simultaneously. When a bidirectional test is run,

FMCs are generated for one direction and checked for the opposite.

Figure 31-17 shows the FMC and BRC cell structure.

Figure 31-17. Performance Monitoring Cell Structure (FMCs and BRCs)

Table 31-10 describes performance monitoring cell fields.

Header = 5 bytes

Payload = 48 bytes

0010 = Performance Management

OAM

Cell

Type

Function

Type

GFC/ VPI

VCI

PTI

CLP HEC

Function

Specific

Fields

Reserved

VPI

45 x 8

CRC-10

Unused

2 octets

4 octets

1 octet

29 octets

2 octets

Time-

Stamp

Total User

Cell 0+1

2 octets

Count

1 octet

0000 = Forward Monitoring (FMC)

0001 = Backward Reporting (BRC)

Monitoring

Sequence

Number

Block

Error

Result

Total

Received

Cells 0+1

2 octets

Total User

Cell 0

Count

2 octets

Total

Received

Cells 0

Block Error

Detection

Code

(MCSN)

(TUC0+1)

(BEDC0+1)1 (TUC0)

(TSTP)

(TRCC0) 2

(BLER) 2 (TRCC0+1)2

1 BEDC

0+1 appears in FMCs only.

2 TRCC

0, BLER, and TRCC0+1 appear in BRCs only.

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