Freescale Semiconductor MCF5480 - Manual (Page 970)

MCF548x Reference Manual, Rev. 3
30-40 Freescale Semiconductor
30.3.3.32 FEC Transmit FIFO Read Pointer Register (FECTFRP)
The read pointer is a FIFO maintained pointer which points to the next FIFO location to be read. The read
pointer can be both read and written. This ability facilitates the debug of the FIFO controller and peripheral
drivers.
30.3.3.33 FEC Transmit FIFO Write Pointer Register (FECTFWP)
The write pointer is a FIFO maintained pointer which points to the next FIFO location to be written. The
write pointer can be both read and written. This ability facilitates the debug of the FIFO controller and
peripheral drivers. The write pointer is reset to zero, and non-functional bits of this pointer will always
remain zero.
Table 30-38. FECTFAR Field Descriptions
Bits Name Descriptions
31–10 — Reserved, should be cleared.
9–0 ALARM Alarm pointer. This pointer indicates the point at which to set the FIFO alarm bit. This value is
compared with the number of data bytes in the FIFO.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
R 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
W
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
R 0 0 0 0 0 0 READ
W
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Reg
Addr
MBAR + 0x91BC (FEC0), 0x99BC (FEC1)
Figure 30-35. FEC Transmit FIFO Read Pointer Register (FECTFRP)
Table 30-39. FECTFRP Field Descriptions
Bits Name Descriptions
31–10 — Reserved, should be cleared.
9–0 READ Read pointer. This pointer indicates the next location to be read by the FIFO controller.