at75c220 ATMEL Corporation, at75c220 Datasheet - Page 43

• Manufacturer Part Number: at75c220
• Description: Smart Internet Appliance Processor Siap
• Manufacturer: ATMEL Corporation

MAC Interrupt Status Register
Register Name: ETH_ISR
Access Type: Read/write
Reset Value: 0x0
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DONE
RCOM
RBNA
TOVR
TUND
TRLE
TBRE
TCOM
LINK
TIDLE
ROVR
HRESP
Management done. The PHY maintenance register has completed its operation. Cleared on read.
Receive complete. A frame has been stored in memory. Cleared on read.
Receive buffer not available. Cleared on read.
Transmit buffer overrun. Software wrote to the address register or length register when bit 4 of the transmit status reg-
ister was not set. Cleared on read.
Transmit error. Ethernet transmit buffer underrun. The transmit DMA did not complete fetch frame data in time for it to
be transmitted. Cleared on read.
Transmit error. Retry limit exceeded. Cleared on read.
Transmit buffer register empty. Software may write a new buffer address and length to the transmit DMA controller.
Cleared by having one frame ready to transmit and another in the process of being transmitted. Cleared on read.
Transmit complete. Set when a frame has been transmitted. Cleared on read.
Set when LINK pin changes value. Optional.
Transmit idle. Set when all frames have been transmitted. Cleared on read.
RX overrun. Set when the RX overrun status bit is set. Cleared on read.
HRESP not OK. Set when the DMA block sees HRESP not OK. Cleared on read.
TCOM
31
23
15
–
–
–
7
TBRE
30
22
14
–
–
–
6
RTRY
29
21
13
–
–
–
5
TUND
28
20
12
–
–
–
4
HRESP
TOVR
27
19
11
–
–
3
ROVR
RBNA
26
18
10
–
–
2
RCOM
LINK
25
17
–
–
9
1
TIDLE
DONE
24
16
–
–
8
0
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