SAM7X256_14 Datasheet, PDF (557/662 Pages) ATMEL Corporation – ARM-based Flash MCU

37.5.7 Receive Status Register
Register Name:
EMAC_RSR
Access Type:
Read-write
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
–
–
–
–
–
–
–
–
15
14
13
12
11
10
9
8
–
–
–
–
–
–
–
–
7
6
5
4
3
2
1
0
–
–
–
–
–
OVR
REC
BNA
This register, when read, provides details of the status of a receive. Once read, individual bits may be cleared by writing 1 to them.
It is not possible to set a bit to 1 by writing to the register.
• BNA: Buffer Not Available
An attempt was made to get a new buffer and the pointer indicated that it was owned by the processor. The DMA rereads the
pointer each time a new frame starts until a valid pointer is found. This bit is set at each attempt that fails even if it has not had a
successful pointer read since it has been cleared.
Cleared by writing a one to this bit.
• REC: Frame Received
One or more frames have been received and placed in memory. Cleared by writing a one to this bit.
• OVR: Receive Overrun
The DMA block was unable to store the receive frame to memory, either because the bus was not granted in time or because a
not OK hresp(bus error) was returned. The buffer is recovered if this happens.
Cleared by writing a one to this bit.
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
557