EB632 datasheet(78/112 Pages) FREESCALE

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

Freescale Semiconductor

Errata

CPM101

FCC RxClav Timing Violation (Slave)

Date Added: 1/15/2004

Date Revised: 11/05/2004

Description: FCC ATM Receive UTOPIA slave mode. When the RxFIFO is full, RxClav is ne-

gated 2 cycles before the end of the cell transfer, instead of 4. A master that polls RxClav or paus-

es 3 or 4 cycles before the end of the cell transfer may sample a false RxClav, and an overrun

condition may occur. The dashed line in the timing diagram below depicts the actual RxClav ne-

gation (two cycles before the end of the cell transfer instead of four cycles). The signals in the

timing diagram are with respect to the master, so the Tx interface is shown.

Workaround:

The master should not poll RxClav or pause a cell transfer 4 cycles before the end

of a cell transfer. The master should poll 2 cycles before the end of the current cell

or later. This can be achieved by introducing cell-to-cell polling (and transfer)

delay, which is equal or larger than one cell transfer time. If this can be achieved,

the impact on performance is minimal.

Configuring ATM only on FCC1 and setting FPSMR[TPRI] ensures the highest pri-

ority to FCC1 Rx. In addition, for CPM usage lower then 80 percent (as reported by

the CPM performance tool based on UTOPIA maximal bus rate), the CPM perfor-

mance is enough to guarantee that the RxFIFO does not fill up.

0K40A

1K42A

2K42A

1K87M

CPM111

FCC Missing Reset

Date Added: 1/15/2004

Description: The TxBD may not close for the FCC in Half-Duplex 10BaseT Ethernet. There

may be a mismatch between the actual transmitted BD and the BD for which the status is updated.

As a result, the status of one to three BDs may not be updated. They appear to be “ready” although

the associated frames have been transmitted (assuming a frame per BD).

Workaround: Use microcode patch provided by Freescale.

System Number: 11064

Fix Plan:

0K40A

1K42A

2K42A

2K87M

Table 50. 2K87M Errata

Errata

Number

Errata Description

Applies

to Mask

TxClk

TxEnb

TxClav

TxData

TxSOC

Clock cycles from end of cell:

4321

P44 P45 P46

P47 P48

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