MPC8280 datasheet(1014/1386 Pages) FREESCALE

1014 / 1386 page

ATM Controller and AAL0, AAL1, and AAL5

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

31-54

Freescale Semiconductor

31.10.2.3.2

AAL1 Protocol-Specific TCT

Figure 31-32 shows the AAL1 protocol-specific TCT.

Table 31-23 describes AAL1 protocol-specific TCT fields.

23456789

Offset + 0x10

—

Valid Octet Size (VOS)

PFM SRT SPF

STF

—

Offset + 0x12

SRTS_DEV

Block Size

Offset + 0x14

SRTS_TMP

Structured Pointer (SP)

Figure 31-32. AAL1 Protocol-Specific TCT

Table 31-23. AAL1 Protocol-Specific TCT Field Descriptions

Offset

Bits

Name

Description

0x10

0–1

—

Reserved, should be cleared.

2–7

VOS

Valid octet size. Partially filled cell mode only. 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.

PFM

Partially filled mode.

0 Partially filled cells mode is not used.

1 Partially filled cells mode is used. The transmitter copies only valid octets from the

buffer to the AAL1 cell. The size of the valid octets from the beginning of the AAL1

user data field is specified in the VOS (valid octet size) field.

SRT

Synchronous residual time stamp. Unstructured format only. The MPC8280 supports

SRTS generation using external logic. If this mode is enabled, the MPC8280 reads the

SRTS from external logic and inserts it into four cells for which SN = 1, 3, 5, or 7. The

MPC8280 reads the new SRTS from external logic every eight cells. (See

Section 31.16, “SRTS Generation and Clock Recovery Using External Logic.”)

0 SRTS mode is not used.

1 SRTS mode is used.

SPF

Structured pointer flag. Indicates that a structured pointer has been inserted in the

current block. The user should initialize this field to zero. Used by the CP only.

STF

Structured format

0 Unstructured format is used.

1 Structured format is used.

—

Reserved, should be cleared.

13–15

Sequence number field. Used by the CP to check the incoming cells SN. Should be

cleared initially.

0x12

0–3

SRTS_DEV Used to select a SRTS device. The SRTS device address is

SRTS_BASE[0–27]+SRTS_DEV[28:31]. SRTS_BASE is taken from the parameter

RAM and is 16-byte aligned.

4–15

Block Size

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

= 0xFFF = 4 Kbytes maximum).

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