参数资料
型号: ZL50408GDC
厂商: CONEXANT SYSTEMS
元件分类: 网络接口
英文描述: DATACOM, LAN SWITCHING CIRCUIT, PBGA208
封装: 17 X 17 MM, 1.40 MM HEIGHT, MO-192, LBGA-208
文件页数: 124/144页
文件大小: 1779K
代理商: ZL50408GDC
ZL50408
Data Sheet
80
Zarlink Semiconductor Inc.
Port 9: (GMAC Port)
12.3.1.5
BUF_LIMIT – Frame Buffer Limit
CPU Address: h0036
Accessed by CPU (R/W)
12.3.1.6
FCC – Flow Control Grant Period
CPU Address: h0037
Accessed by CPU (R/W)
Bits [1:0]:
Enable PHY Mode
00: MAC Mode (Default)
11: PHY Mode (Reverse MII)
Only valid in MII interface mode. In PHY mode, M9_RXCLK pin becomes an
output and M9_MTXCLK must be tied to M9_RXCLK externally.
Bit [2]:
Internal loopback.
0: Disable (Default)
1: Enable
In this mode, the packet is looped back in the MAC layer before going out of the
chip. You must force linkup at full duplex as well.
External loopback is another level of system diagnostic which involves the PHY
device to loopback the packet.
Bits [4:3]:
Interface mode:
00 - MII mode
11 - GMII mode (Default)
Bit [5]:
Frame loopback.
0: Disable frame from sending back to its source port. (Default)
1: Allow frame to send back to its source port
In a regular ethernet switch, a packet should never be receive and forwarded to
the same port. Setting the bit allows it to happen.
This is not the same as an ingress MAC loopback. The destination MAC address
has to be stored (learned) in the MCT and associated with the originating source
port. The frame loopback will only work for unicast packets.
Bit [6]:
Reserved
Bit [7]:
Soft reset.
0: Normal operation (Default)
1: Reset. Not self clearing.
Bits [6:0]:
Frame Buffer Limit (max 4 KB). Multiple of 64 bytes (Default 0x40)
Bit [7]:
Reserved
Bits [2:0]:
Flow Control Grant Period. (Default 0x3)
Units are (FCC[2:0]+1)*4us
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