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78Q8430-100IGT/F 参数 Datasheet PDF下载

78Q8430-100IGT/F图片预览
型号: 78Q8430-100IGT/F
PDF下载: 下载PDF文件 查看货源
内容描述: 10/100以太网MAC和PHY [10/100 Ethernet MAC and PHY]
分类和应用: 电信集成电路编码器以太网局域网(LAN)标准
文件页数/大小: 88 页 / 1209 K
品牌: TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
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78Q8430 Data Sheet  
DS_8430_001  
6.7.1 Address Filtering  
The 78Q8430 CAM is loaded upon reset with a set of default rules for users who only want to use the  
address filter feature (see Section 6.7.4). The following rules are intended as a template to provide  
address-filtering functionality. They support four multicast and eight unicast address filters. The last  
unicast address filter rule is configured by default as a promiscuous mode rule such that the address-filter  
is in promiscuous mode right out of reset.  
6.7.1.1 Promiscuous Mode Off  
In promiscuous mode, all addresses are passed on to the host driver. This means that, as long as  
promiscuous mode is enabled, none of the other address filters are effective. Promiscuous mode must  
therefore be disabled before any address filtering can happen. The following procedure should be used  
to deactivate promiscuous mode:  
STEP 1. Change the Match Control field of rule 0x30 from MD to DROP. This will cause any frame with  
an address that does not match any other address filter to be dropped.  
6.7.1.2 Promiscuous Mode On  
The promiscuous mode filter is a filter with all address bits masked as wildcard bits such that any address  
will match. Turning promiscuous mode on and off is the same as changing the promiscuous mode filter  
from a positive filter to a negative filter (see Section 6.7.1.5). The following procedure should be used to  
activate promiscuous mode:  
STEP 1. Change the Match Control field of rule 0x30 from DROP to MD. This will cause all frames to  
pass the address filters.  
6.7.1.3 Unicast Address Filters  
The default CAM rule set supports eight unicast address filters. The first, unicast filter #0, is the  
promiscuous mode filter and is reserved for that purpose. The remaining seven are general use. Each  
filter has two components, the 48-bit address that it matches and a mask that defines which bits of the  
address are relevant and which bits are wildcards. Each byte of each address filter has a rule assigned  
to it. The following table summarizes the association of unicast filter bytes and CAM rules.  
Table 24: CAM Rules Associated with Unicast Filter Bytes  
Byte [0]  
0x77  
0x76  
0x75  
0x74  
0x73  
0x72  
0x71  
Byte [1]  
0x6F  
0x6E  
0x6D  
0x6C  
0x6B  
0x6A  
0x69  
Byte [2]  
0x5F  
0x5E  
0x5D  
0x5C  
0x5B  
0x5A  
0x59  
Byte [3]  
0x57  
0x56  
0x55  
0x54  
0x53  
0x52  
0x51  
Byte [4]  
0x47  
0x46  
0x45  
0x44  
0x43  
0x42  
0x41  
Byte [5]  
0x37  
0x36  
0x35  
0x34  
0x33  
0x32  
0x31  
U/C Filter #7  
U/C Filter #6  
U/C Filter #5  
U/C Filter #4  
U/C Filter #3  
U/C Filter #2  
U/C Filter #1  
Note: Bytes are in network transmit order starting with Byte [0].  
34  
Rev. 1.2