MPC8280 datasheet(1089/1386 Pages) FREESCALE

1089 / 1386 page

ATM AAL1 Circuit Emulation Service

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

32-29

32.9.1.1

AAL1 CES Protocol-Specific RCT

Figure 32-22 shows the AAL1 CES protocol-specific area of an RCT entry.

Table 32-6 describes AAL1 CES protocol-specific RCT fields.

Offset + 0x0E

SRTS_DEV

—

PFM

SRT

INVE STF

—

Offset + 0x10

OCASB/SRTS_TMP

—

Valid Octet Size (VOS)

Offset + 0x12

SPV

—

Structured Pointer (SP)

Offset + 0x14

RBDCNT

Offset + 0x16

Block Size

—

Offset + 0x18

Super Channel Number

RXBM

SLIPIM

—

CASBS

Figure 32-22. AAL1 CES Protocol-Specific RCT

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

Offset

Bits

Name

Description

0x0E

0–3

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.

4–7

—

Reserved, should be cleared during initialization.

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).

Note that in CAS mode (CESM=1) this bit must be set by the user; see Section 32.4.1,

“Automatic Data Forwarding.”

STF

Structured format.

0 Unstructured format is used.

1 Structured format is used.

Note that although the structured format may be used, if the block size is one, the user

should clear STF. Only non P-format AAL1 cells are received. The receiver does not

check the AAL1 structured pointer because there is no need to when the block size is one.

12–15

—

Reserved, should be cleared during initialization.

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