MPC8280 datasheet(1222/1386 Pages) FREESCALE

1222 / 1386 page

ATM Transmission Convergence Layer

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

35-6

Freescale Semiconductor

35.2.2.1

Transmit ATM 2-Cell FIFO

The transmit FIFO provides FIFO management and an interface to the UTOPIA transmit interface. The

FIFO provides the cell rate decoupling between the transmission system physical layer and the ATM layer.

The FIFO management includes emptying cells from the transmit FIFO, indicating to the UTOPIA

interface that it is full, maintaining the FIFO read and write pointers, and detecting FIFO underrun

(TCER[UR]) conditions.

35.2.3

Receive UTOPIA Interface

This block performs the receive interface with the FCC via the UTOPIA bus. It implements the UTOPIA

level-2 (multi-PHY) 8-bit PMD side (slave) interface.

35.2.4

Transmit UTOPIA Interface

This block performs the transmit interface with the FCC via the UTOPIA bus. It implements the UTOPIA

level-2 (multi-PHY) 8-bit PMD side (slave) interface.

35.3

Signals

The TC layer is operated via an SI TDM port using a serial protocol. Synchronization signals are required

for some applications and must be supported. Table 35-1 describes the signals required for operating the

TC layer.

35.4

TC Layer Programming Mode

This section describes the TC layer-specific registers and other programming model features. For a

complete and concise list of TC layer registers, refer to Chapter 3, “Memory Map.”

35.4.1

TC Layer Registers

Each TC layer block is controlled by registers located in the block and accessed from the 60x bus.

Table 35-1. TC Layer Signals

Signal

Direction

Description

Txc

Input

Tx clock. Clocks Tx data out of the TC to external device.

Txd

Output

Tx data from TC to external device.

Txsyn

Input

Tx synch. Synchronizes the transmit data to the beginning of a frame.

Rxc

Input

Rx clock. Clocks the data into the TC.

Rxd

Input

Rx data. From external device to the TC.

Rxsyn

Input

Rx synch. Synchronizes the received data.

MPC8280 Datasheet(PDF) 1222 Page - Freescale Semiconductor, Inc

MPC8280 Datasheet(HTML) 1222 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL