MPC8544COMEDEV Freescale Semiconductor, MPC8544COMEDEV Datasheet - Page 772

• Manufacturer Part Number: MPC8544COMEDEV
• Description: KIT DEV EXPRESS MPC8544COM
• Manufacturer: Freescale Semiconductor
• Type: MPUr

Specifications of MPC8544COMEDEV

• Contents: Board
• For Use With/related Products: MPC8544
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Enhanced Three-Speed Ethernet Controllers
Table 15-16
15-40
Bits
0
1
2
THLT0 Transmit halt of ring 0. Set by the eTSEC if is no longer processing transmit frames from this TxBD ring, and
THLT1 Transmit halt of ring 1. Set by the eTSEC if is no longer processing transmit frames from this TxBD ring, and
THLT2 Transmit halt of ring 2. Set by the eTSEC if is no longer processing transmit frames from this TxBD ring, and
Name
describes the fields of the TSTAT register.
MPC8544E PowerQUICC III Integrated Host Processor Family Reference Manual, Rev. 1
DMA from this ring is disabled. To re-start transmission from this TxBD ring, this bit must be cleared by writing
1 to it. This bit is set only on a general error condition (as in IEVENT[TXE]), regardless of TQUEUE[EN0], or
if no ready TxBDs can be fetched. DMACTRL[GTS] being set by the user does not cause this bit to be set.
Software should examine the halted queue's buffer descriptors for repeatable error conditions before taking it
out of the halt state. Failure to do so may cause an effective livelock, in which the error condition recurs and
halts all queues again.
Repeatable error conditions which cause halt include:
Bus error:
TxBD programming errors:
DMA from this ring is disabled. To re-start transmission from this TxBD ring, this bit must be cleared by writing
1 to it. This bit is set only on a general error condition (as in IEVENT[TXE]), regardless of TQUEUE[EN1], or
if no ready TxBDs can be fetched.DMACTRL[GTS] being set by the user does not cause this bit to be set.
Software should examine the halted queue's buffer descriptors for repeatable error conditions before taking it
out of the halt state. Failure to do so may cause an effective livelock, in which the error condition recurs and
halts all queues again.
Repeatable error conditions which cause halt include:
Bus error:
TxBD programming errors:
DMA from this ring is disabled. To re-start transmission from this TxBD ring, this bit must be cleared by writing
1 to it. This bit is set only on a general error condition (as in IEVENT[TXE]), regardless of TQUEUE[EN2], or
if no ready TxBDs can be fetched. DMACTRL[GTS] being set by the user does not cause this bit to be set.
Software should examine the halted queue's buffer descriptors for repeatable error conditions before taking it
out of the halt state. Failure to do so may cause an effective livelock, in which the error condition recurs and
halts all queues again.
Repeatable error conditions which cause halt include:
Bus error:
TxBD programming errors:
• Invalid BD or data address
• Uncorrectable error on BD or data read
• Ready=1 and length=0
• Invalid BD or data address
• Uncorrectable error on BD or data read
• Ready=1 and length=0
• Invalid BD or data address
• Uncorrectable error on BD or data read
• Ready=1 and length=0
Table 15-16. TSTAT Field Descriptions
Description
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