ax88796blf ASIX Electronics Corporation, ax88796blf Datasheet - Page 51

• Manufacturer Part Number: ax88796blf
• Description: Low-pin-count Non-pci 8/16-bit 10/100m Fast Ethernet Controller
• Manufacturer: ASIX Electronics Corporation

5.1.71 Flow Control Register (FCR)
Offset 1AH (Read/Write)
5.1.72 MAC Configure Register (MCR)
Offset 1BH (Read/Write)
Field
7
6
5:0
Field
7
6
5
4
3
2
1
0
FLWC
BPEN
HWPC
DUPX
BPLE
BBTC
MPSEL
VLANE
CPTEFF Capture effect.
ZEROBF Zero Back Off Time.
Name
Name
SPMAC
Description (Default = 07h)
Flow-control
0: Flow-control disable (Default)
1: Flow-control enable
Back Pressure in half-duplex flow-control (AX88796B will ignore this bit when running at
full-duplex mode)
0: Back Pressure disable (Default)
1: Back Pressure enable
High Water free Page Count. Default value is 7 (7 * 256 = 1792 bytes).
Description
MAC duplex mode setting
When read, this bit is indicates the real duplex setting in MAC operation.
0: half-duplex
1: full-duplex
When write, this duplex setting was wire or with TCR bit-7. Each one goes high then
configures MAC as full-duplex mode. AX88796B will ignore this bit and TCR bit-7 when
using internal PHY.
Back-pressure leakage enable when continuous of collision N times.
N number is reference register 17H of Back-pressure Jam Limit count.
0: Allow flow-control leakage to avoid HUB port going partition state due to too many of
collision (Default)
1: No flow-control leakage
Back-To-Back Transmission Control:
0: Disable (Default)
1: Enable Back-To-Back Transmission, Host can continue set TXP without check transmit
completed
Host can ignore Number of Collisions Register (NCR)
Media Select by Program
0: internal PHY is selected (Default)
1: external MII PHY is selected.
VLAN enable
0: No supported VLAN frame tagged (Default)
1: Only accept Tag frames. AX88796 will reject packet if Tag x8100 and VID not match
whit setting by host. Null VID (VID = 0) is acceptable.
0: always write low (Default)
1: for MAC test only. Force first collision of back off is 2 slot-time and second collision of
back off is 0 slot time. Others as normal.
Super MAC.
0: always write low (Default)
1: for MAC test only. Back-off only 0 ~ 3 slot-time
0: always write low (Default)
1: for MAC test only. Back Off Time always zeros.
51
AX88796BLF / AX88796BLI
ASIX ELECTRONICS CORPORATION