EB632 datasheet(48/112 Pages) FREESCALE

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

Freescale Semiconductor

CPM

14.4.13 Cell Delineation State Machine Register (CDSMRx)

The cell delineation state machine register (CDSMR), shown in Figure 19, holds the ALPHA and DELTA

parameters of the cell delineation state machine.

Table 35 describes the CDSMR fields.

7–8

Receive Idle/unassigned Cells Filtering

Selects the type of filtering to perform on received cells. The header of an idle

cell (ITU-T I.361) is 0b00000000_00000000_00000000_00000001. The

header of an unassigned cell (ITU-T I.361) is

0b00000000_00000000_00000000_0000xxx0

Physical layer cells bypass the TC layer; they are not filtered. The filter works

on the header only and ignores the HEC.

No cell filtering is done on Rx cells.

Idle cell filtering is done and idle cells

are discarded.

Unassigned cell filtering is done and

unassigned cells are discarded.

Idle and unassigned cell filtering is

done and both idle and unassigned

cells are discarded.

URE

Underrun interrupt (TCER[UR]) enable

An underrun interrupt may be set when an idle cell is generated by the TC.

Underrun interrupt disabled

Underrun interrupt enabled

10–11

Loopback/echo modes

For echo mode operation, clear TCMODE[SM], independent of the FCC multi-

PHY mode configuration.

Normal operation.

Cell echo mode operation. Received

cells are transmitted and do not go out

to the UTOPIA bus.

Data loopback mode operation.

Transmit data stream is connected to

the receive data stream.

Not used.

TBA

Transmit Byte Align

Enables alignment of transferred bytes to the Tx Sync signal.

Tx data is transferred as soon as it is

enabled

Tx data is transferred byte-aligned to

the Tx Sync signal

IMA

IMA mode

Enables IMA mode.

Rx is not in IMA

Rx is in IMA mode

Single Mode

Indicates whether the TC is the only PHY on the UTOPIA interface.

TC is not the only PHY on UTOPIA

TC is the only PHY on UTOPIA

Cell Counters Mode

Disables the counter read and then clear function.

Reading a cell counter clears the

counter

Reading a cell counter does not

change the counter value

Bit

0123

4567

Field

ALPHA

DELTA

—

Reset

0000

000

R/W

Figure 19. CDSMRx

Table 35. CDSMR Field Descriptions

Name

Description

ALPHA

0-4

ALPHA

Consecutive received cells with incorrect HEC are counted by the cell delineation state machine to pass from state SYNCH

to state HUNT.

DELTA

5-9

DELTA

Consecutive received cells with correct HEC are counted by the cell delineation state machine to pass from state

PRESYNCH to state SYNCH.

—

10–15

Reserved. Write to 0 for future compatibility.

Table 34. TCMODE Field Descriptions (Continued)

Name

Description

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