Information
Enhanced Three-Speed Ethernet Controllers
MPC8308 PowerQUICC II Pro Processor Reference Manual, Rev. 1
16-32 Freescale Semiconductor
Table 16-13 describes the fields of the PTV register.
16.5.3.1.8 DMA Control Register (DMACTRL)
DMACTRL is writable by the user to configure the DMA block. Figure 16-9 describes the definition for
the DMACTRL register.
Table 16-14 describes the fields of the DMACTRL register.
Offset eTSEC1:0x2_4028; eTSEC2:0x2_5028 Access: Read/Write
0151631
R
PTE PT
W
Reset All zeros
Figure 16-8. PTV Register Definition
Table 16-13. PTV Field Descriptions
Bits Name Description
0–15 PTE Extended pause control. This field allows software to add a 16-bit additional control parameter into the PAUSE
frame to be sent when TCTRL[TFC_PAUSE] is set. Note that current IEEE 802.3 PAUSE frame format
requires this parameter to be cleared.
16–31 PT Pause time value. Represents the 16-bit pause quanta (that is, 512 bit times). This pause value is used as
part of the PAUSE frame to be sent when TCTRL[TFC_PAUSE] is set. See Section 16.6.2.8, “Flow Control,”
for more information.
Offset eTSEC1:0x2_402C; eTSEC2:0x2_502C Access: Read/Write
0151617232425262728293031
R
— LE — TDSEN TBDSEN — GRS GTS TOD WWR WOP
W
Reset All zeros
Figure 16-9. DMACTRL Register
Table 16-14. DMACTRL Field Descriptions
Bits Name Description
0–15 — Reserved
16 LE Little-endian descriptor mode enable. This bit controls both the reading and writing of descriptors; data
buffers are always transferred in network byte order.
0 RxBDs and TxBDs are interpreted with big-endian byte ordering, as shown in Section 16.6.7.1, “Data
Buffer Descriptors.”
1 RxBDs and TxBDs are interpreted with little-endian byte ordering. That is, the 16 bits of flags are
considered a complete half-word unit, the buffer length is considered another complete half-word unit, and
the buffer pointer is considered a complete word unit.
17–23 — Reserved
24 TDSEN Tx Data snoop enable.
0 Disables snooping of all transmit frames from memory.
1 Enables snooping of all transmit frames from memory.