MPC8280 datasheet(1223/1386 Pages) FREESCALE

1223 / 1386 page

ATM Transmission Convergence Layer

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

35-7

35.4.1.1

TC Layer Mode Registers 1–8 (TCMODE

Each TC layer block is configured using a TC layer mode register TCMODEx, as shown in Figure 35-5.

Table 35-2 describes TCMODE fields.

Field RXEN

TXEN

RPS

TPS

SBC

URE

TBA

IMA

Reset

0000_0000_0000_0000

R/W

Figure 35-5. TC Layer Mode Registers (TCMODE

Table 35-2. TCMODE

x Field Descriptions

Bits

Name

Description

RXEN

TC Layer Rx enable bit. Enables the TC Layer Rx block operation:

0 TC Layer Rx operation is disabled.

1 TC Layer Rx operation is enabled.

TXEN

TC Layer Tx enable bit. Enables the TC Layer Tx block operation:

0 TC Layer Tx operation is disabled.

1 TC Layer Tx operation is enabled.

RPS

Rx Payload DeScrambling

0 Payload descrambling is performed on received payload data.

1 No payload descrambling is performed on received payload data.

TPS

Tx Payload Scrambling

0 Payload scrambling is performed on transmitted payload data.

1 No payload scrambling is performed on transmitted payload data.

Rx Coset Enable

0 XOR with 0xAA is done on received HEC.

1 No XOR with 0xAA is done on received HEC.

Tx Coset Enable

0 XOR with 0xAA is done on transmitted HEC.

1 No XOR with 0xAA is done on transmitted HEC.

SBC

Header Single Bit error Correction

0 Perform single bit error correction on the header according to HEC while in Synch mode.

1 Do not perform single bit error correction on the header.

7–8

Rx Idle/Unassigned Cells Filtering

00 No cell filtering is done on Rx cells.

01 Idle cell filtering is done - idle cells are discarded.

10 Unassigned cell filtering is done - unassigned cells are discarded.

11 Idle and unassigned cell filtering is done - both idle and unassigned cells are discarded.

The Header of idle cell (ITU-T I.361): b00000000_00000000_00000000_00000001

The Header of unassigned cell (ITU-T I.361): b00000000_00000000_00000000_0000xxx0

Note that physical layer cells bypass the TC layer; they are not filtered. Also note that the filter

works on the header only and ignores the HEC.

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