MPC8280 datasheet(1072/1386 Pages) FREESCALE

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ATM AAL1 Circuit Emulation Service

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

32-12

Freescale Semiconductor

Figure 32-9. Mapping CAS Entry

32.4.7.1

CAS Routing Table

Figure 32-10 shows the structure of a CAS routing table. The CP maintains a pointer which steps through

the table and wraps back to the beginning of the table after servicing the last entry (W=1).

Figure 32-10. AAL1 CES CAS Routing Table (CRT)

Figure 32-11 describes the structure of a CAS routing table entry.

Figure 32-11. AAL1 CES CAS Routing Table Entry

123

Offset + 0x00

—

F/S

Signaling offset pointer (SOP)

XXXX

ABCD

F/S=0

Example of one MCC super channel in ESF framing (T1) containing 4 TDM slots connected to

an ATM channel with one CAS routing table (CRT). See Section 1.4.7.1, “CAS Routing Table.”

One ATM CAS

Slot 0

Slot 1

Slot 2

Slot 23

• • • • • •

routing table

One MCC super channel that

contains only 4 active channels

W=0

Signaling offset pointer

First signaling nibble

—

F/S

Last signaling nibble

ATM current pointer

Byte

W=0

Signaling offset pointer

—

F/S

W=0

Signaling offset pointer

—

F/S

W=0

Signaling offset pointer

—

F/S

W=0

Signaling offset pointer

—

F/S

W=1

Signaling offset pointer

—

F/S

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