MPC8280 datasheet(1091/1386 Pages) FREESCALE

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ATM AAL1 Circuit Emulation Service

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

32-31

0x18

0–7

SCN

Super Channel Number.

This field should contain the MCC Super Channel Number that mapped to this ATM

channel. This field must be initialized by the user in CES mode only. See

Section 32.4.7, “Mapping VC Signaling to CAS Blocks.”

RXBM

Receive buffer interrupt mask

0 The receive buffer event of this channel is disabled. (The event is not sent to the

interrupt queue.)

1 The receive buffer event of this channel is enabled.

SLIPIM

Slip interrupt mask

0 The slip interrupts SLIPS and SLIPE are both masked.

1 When the receiver switches to hunt mode due to a 3-step-SN algorithm fault, or due to

two successive mismatched pointers, or due to a pre-overrun condition, the SLIPS

interrupt is sent to the interrupt queue. See Section 32.6, “3-Step-SN Algorithm,” and

Section 32.13, “AAL1 CES Exceptions.” When the receiver resynchronizes, SLIPE

interrupt is sent to the interrupt queue. Note that this is the error reporting mechanism

during automatic data forwarding (ATM-to-TDM bridging).

10–11

—

Reserved, should be cleared during initialization.

12–15

CASBS

CAS block size.This field contains the number divided by two (N/2) of signaling nibbles

mapped to this ATM channel. See Section 32.4.7, “Mapping VC Signaling to CAS

Blocks.”

Note that if the number of signaling nibbles is odd, this field should be programmed to

(N+1)/2. See Section 32.2.2, “Signaling Path.”

Example: ESF with three T1 time slots connected to one ATM channel. The Data_Size

= 3*24 = 72 octets and the CAS Block= 2 octets (N=3, (N+1)/2 = 2), so in this case the

Block_Size = 72+2 = 74

Table 32-6. AAL1 CES Protocol-Specific RCT Field Descriptions (continued)

Offset

Bits

Name

Description

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