EB632 datasheet(44/112 Pages) FREESCALE

44 / 112 page

Functional Differences Between MSC8101 (Mask 2K42A) and MSC8103 (Mask 2K87M), Rev. 2

Freescale Semiconductor

CPM

14.4.3 TC Layer Support

The TC layer block is shown in Figure 15. The transmit and the receive parts are independent; the only case in

which they are synchronized is in cell echo mode.

14.4.4 Signals

The TC layer operates via an SI TDM port or NMSI port using a serial protocol. Synchronization signals are

required for some applications and must be supported. Table 33 describes the signals for operating the TC layer.

Figure 15. TC Layer Block Diagram

Table 33. TC Layer Signals

Signal

Direction

Description

TXC

Input

Transmit Clock. Clocks Tx data out of the TC to external device.

TXD

Output

Transmit Data from TC to external device.

Tx Sync

Input

Transmit Synch. Synchronizes the transmit data to the beginning of a frame.

RXC

Input

Receive Clock. Clocks the data into the TC.

RXD

Input

Receive Data. From external device to the TC.

Rx Sync

Input

Receive Synch. Synchronizes the received data. Not required in NMSI mode.

PowerQUICC II

TC Layer

PHY

Rx Cell

Functions

• cell delineation

• descrambling

• coset

• HEC error

correction

Tx UTOPIA I/F

Rx UTOPIA I/F

(PHY)

Tx Serial I/F

Rx Serial I/F

Counters

Registers

FCC2

one channel

DBB Bus

UTOPIA

Rx I/F

UTOPIA

Tx I/F

M-PHY

detection and

Rx FIFO

Tx FIFO

Tx Cell

Functions

• HEC generation

• scrambling

• coset

• rate adaptation

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