MPC8280 datasheet(1008/1386 Pages) FREESCALE

1008 / 1386 page

ATM Controller and AAL0, AAL1, and AAL5

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

31-48

Freescale Semiconductor

Table 31-19 describes AAL1 protocol-specific RCT fields.

Table 31-19. AAL1 Protocol-Specific RCT Field Descriptions

Offset

Bits

Name

Description

0x0E

0–7

—

Reserved, should be cleared.

PFM

Partially filled mode.

0 Partially filled cells mode is not used.

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

AAL1 cell to the Rx buffer. The number 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

clock recovery using an external SRTS PLL. The MPC8280 tracks the SRTS from the

incoming four cells with SN = 1, 3, 5, and 7 and writes it to the external SRTS device.

Every eight cells the CP writes a valid SRTS to external logic. (See Section 31.16,

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

0 SRTS mode is not used.

1 SRTS mode is used.

INVE

Inverted empty.

0 RxBD[E] is interpreted normally (1 = empty, 0 = not empty).

1 RxBD[E] is handled in negative logic (0 = empty, 1 = not empty).

STF

Structured format

0 Unstructured format is used.

1 Structured format is used.

12–15

—

Reserved, should be cleared.

0x10

0–3

SRTS_TMP 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.

4–11

—

Reserved, should be cleared.

12–15

SRTS_DEV Selects an SRTS device, whose address is SRTS_BASE[0–27] + SRTS_DEV[28–31].

The 16 byte-aligned SRTS_BASE is taken from the parameter RAM.

0x12

0–1

—

Reserved, should be cleared.

2–7

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.

SPV

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

9–15

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 may bytes remain in the current Rx buffer. Initialized with

MRBLR whenever the CP opens a new buffer.

0x16

0–12

—

Reserved, should be cleared.

13–15

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

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