ax88790 ASIX Electronics Corporation, ax88790 Datasheet - Page 22

• Manufacturer Part Number: ax88790
• Description: Pcmcia 10/100m Fast Ethernet Controller With Embedded Phy
• Manufacturer: ASIX Electronics Corporation

4.3.1 Command Register (CR) Offset 00H (Read/Write)
4.3.2 Interrupt Status Register (ISR) Offset 07H (Read/Write)
FIELD
FIELD
7:6
5:3
2
1
0
7
6
5
4
3
2
1
0
AX88790 L
RD2,RD1
PS1,PS0 PS1,PS0 : Page Select
START START :
NAME
NAME
STOP
OVW
,RD0
RDC
CNT
TXE
RXE
TXP
PTX
PRX
RST
The two bits selects which register page is to be accessed.
RD2,RD1,RD0 : Remote DMA Command
These three encoded bits control operation of the Remote DMA channel. RD2 could be set
to abort any Remote DMA command in process. RD2 is reset by AX88790 when a Remote
DMA has been completed. The Remote Byte Count should be cleared when a Remote DMA
has been aborted. The Remote Start Address is not restored to the starting address if the
Remote DMA is aborted.
TXP : Transmit Packet
This bit could be set to initiate transmission of a packet
This bit is used to active AX88790 operation.
STOP : Stop AX88790
This bit is used to stop the AX88790 operation.
Reset Status :
CR. Writing to this bit is no effect.
Remote DMA Complete
Counter Overflow
Over Write: Set when receive buffer ring storage resources have been exhausted.
Transmit Error
Receive Error
Packet Transmitted
Packet Received
RD2 RD1 RD0
Set when AX88790 enters reset state and cleared when a start command is issued to the
Set when remote DMA operation has been completed
Set when MSB of one or more of the Tally Counters has been set.
Set when packet transmitted with one or more of the following errors
Indicates that a packet was received with one or more of the following errors
Indicates packet received with no error.
Indicates packet transmitted with no error
0
0
0
0
1
PS1
n Excessive collisions
n
CRC error
Frame Alignment Error
FIFO Overrun
Missed Packet
0
0
FIFO Under-run
0
0
1
1
X
PS0
X
0
1
0
1
0
1
3-in-1 PCMCIA Fast Ethernet Controller
Not allowed
Remote Read
Remote Write
Not allowed
Abort / Complete Remote DMA
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DESCRIPTION
DESCRIPTION
ASIX ELECTRONICS CORPORATION