at75c220 ATMEL Corporation, at75c220 Datasheet - Page 41

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

MAC Transmit Status Register
Register Name: ETH_TSR
Access Type: Read/write
Reset Value: 0x18
•
•
•
•
•
•
•
OVR
COL
RLE
IDLE
BNQ
COMP
UND
Ethernet transmit buffer overrun. Software wrote to the address register or length register when bit 4 was not set.
Cleared by writing a one to this bit.
Collision occurred. Set by the assertion of collision. Cleared by writing a one to this bit.
Retry limit exceeded. Cleared by writing a one to this bit.
Transmitter Idle. Asserted when the transmitter has no frame to transmit. Will be cleared when a length is written to
transmit frame length portion of the Transmit Control register. This bit is read-only.
Ethernet transmit buffer not queued. Software may write a new buffer address and length to the transmit DMA control-
ler. Cleared by having one frame ready to transmit and another in the process of being transmitted. This bit is read-
only.
Transmit complete. Set when a frame has been transmitted. Cleared by writing a one to this bit.
Transmit underrun. Set when transmit DMA was not able to read data from memory in time. If this happens, the trans-
mitter will force bad CRC. Cleared by writing a one to this bit.
31
23
15
–
–
–
7
–
UND
30
22
14
–
–
–
6
COMP
29
21
13
–
–
–
5
BNQ
28
20
12
–
–
–
4
IDLE
27
19
11
–
–
–
3
RLE
26
18
10
–
–
–
2
COL
25
17
–
–
9
–
1
OVR
24
16
–
–
8
–
0
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