Freescale Semiconductor MCF5480 - Manual (Page 962)

MCF548x Reference Manual, Rev. 3
30-32 Freescale Semiconductor
30.3.3.24 FEC Receive FIFO Read Pointer Register (FECRFRP)
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.
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 ALARM
W
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Reg
Addr
MBAR + 0x9198 (FEC0), 0x9998 (FEC1)
Figure 30-26. FEC Receive FIFO Alarm Register (FECRFAR)
Table 30-30. FECRFAR 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 free 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 + 0x919C (FEC0), 0x999C (FEC1)
Figure 30-27. FEC Receive FIFO Read Pointer Register (FECRFRP)