Freescale Semiconductor MPC8260 - Manual (Page 907)

Fast Communications Controllers (FCCs)
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
Freescale Semiconductor 29-9
Fields in the FTODR are described in Table 29-3.
.
29.6 FCC Buffer Descriptors
Data associated with each FCC is stored in buffers. Each buffer is referenced by a buffer descriptor (BD).
All of the transmit BDs for an FCC are grouped into a TxBD circular table with a programmable length.
Likewise, receive BDs form an RxBD table. The user can program the start address of the BD tables
anywhere in system memory. See
Figure 29-5 .
0 1 15
Field TOD —
Reset 0000_0000_0000_0000
R/W R/W
Addr 0x0x11308 (FTODR1), 0x0x11328 (FTODR2), 0x0x11348 (FTODR3)
Figure 29-4. FCC Transmit-on-Demand Register (FTODR)
Table 29-3. FTODR Field Descriptions
Field Name Description
0 TOD Transmit on demand
0 Normal polling.
1 The CP gives high priority to the current TxBD and begins sending the frame does without waiting
for the normal polling time to check TxBD[R]. TOD is cleared automatically.
1–15 — Reserved, should be cleared.