MPC8280 datasheet(1090/1386 Pages) FREESCALE

1090 / 1386 page

ATM AAL1 Circuit Emulation Service

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

32-30

Freescale Semiconductor

0x10

0–3

OCASB/SR

TS_TMP

OCASB applies when in CAS mode. Outgoing CAS Block. Points to one of the eight

available internal CAS blocks. The starting address of the table is

OUT_CAS_BLOCK_BASE+OCASB¥ 32. See Section 32.4.7.1, “CAS Routing Table” for

more details.

Note that the RCT and TCT use the same CAS routing table (CRT).

SRTS_TMP applies when not in CAS mode. Used by the CP to store the received SRTS

code. After a cell with SN = 7 is received, the CP writes the SRTS code to the external

SRTS device.

Note that when the receiver is in hunt mode SRTS information is not updated.

4–9

—

Reserved, should be cleared during initialization.

10–15

VOS

Valid octet size. Specifies the number of valid octets from the beginning of the AAL1 user

data field. For unstructured, service values 1–47 are valid; for structured service, values

1-46 are valid. Partially filled cell mode only.

0x12

SPV

Structured pointer valid. Should be user-initialized user to zero. Structured format only.

1–3

—

Reserved, should be cleared during initialization.

4–15

Structured pointer. Used by the CP to calculate the structured pointer. This field should

be initialized by the user to zero. Used in structured format only.

0x14

—

RBDCNT

RxBD count. Indicates how many bytes remain in the current Rx buffer. Initialized with

MRBLR whenever the CP opens a new buffer.

0x16

0–11

Block Size

Used only in structured format. Specifies the structured block size (Block Size = 0xFFF =

4 Kbytes maximum).

Note that when working in CAS mode (CESM=1 and CASM=1), the block size should be

programmed to the superframe block size plus the size of the CAS block. However, when

working in basic mode (CES without CAS: CESM=1 and CASM=0) the block size should

be programmed to the number of MCC slots (Nx64) per frame assigned to this channel.

—

Reserved, should be cleared during initialization.

13–15

Sequence number. Used by the CP to check incoming cell’s sequence number.

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

Offset

Bits

Name

Description

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