MPC8540 datasheet(1235/1302 Pages) FREESCALE

1235 / 1302 page

Changes From Revision 0 to Revision 1

MPC8540 PowerQUICC III Integrated Host Processor Reference Manual, Rev. 1

Freescale Semiconductor

A-23

14.6.2.2, 14-108

Replace the existing procedure list with the following list:

“Following is a procedure to gracefully reset and reconfigure the MAC:

1. Set GTS bit in DMACTRL register

2. Poll GTSC bit in IEVENT register until detected as set

3. Clear both Rx_EN and Tx_EN bits in MACCFG1

4. Set GRS bit in DMACTRL register

5. Poll GRSC bit in IEVENT register until detected as set

6. Set Soft_Reset bit in MACCFG1 register

7. Clear Soft_Reset bit in MACCFG1 register

8. Load TBASE with new TxBD pointer

9. Load RBASE with new RxBD pointer

10. Set up other MAC registers (MACCFG1, MAXFRM, and so on)

11. Set WWR, WOP, TOD bits in DMACTRL register

12. Clear THLT bit in TSTAT register and QHLT bit in RSTAT register by

writing 1 to these bits

13. Clear GRS/GTS bits in DMACTRL (do not change other bits)

14. Enable Tx_EN/Rx_EN in MACCFG1 register”

14.6.2.2, 14-108

Insert the following step between steps 3 and (formerly) 4:

"4. Wait for a period of 9.6 Kbytes worth of data on the interface (~8ms

worst case)."

14.6.2.2, 14-109

Correct step 11 of the graceful reset procedure to read:

"11. Set WWR and WOP bits in DMACTRL register"

14.6.2.3, 14-109

Replace the second paragraph with the following:

"If the user has a frame ready to transmit, a transmit-on-demand function

may be emulated while in polling mode by using the graceful-transmit-stop

feature. First, clear the IMASK[GTSCEN] bit to mask the

graceful-transmit-stop complete interrupt. Next set, then immediately clear

the DMACTRL[GTS] bit. Clear the resulting IEVENT[GTSC] bit. Finally,

the IMASK[GTSCEN] bit may be set once again."

14.6.2.3, 14-110

Insert the following sentence between the third and (formerly) fourth

sentences of the sixth paragraph:

"The pause duration is defined by the received pause control frame and

begins when the frame was first received."

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