参数资料
型号: GT-48208
厂商: Galileo Technology Services, LLC
英文描述: Advanced Switched Ethernet Controllers for 10+10/100 BaseX(高级交换式 10+10/100 BaseX以太网控制器)
中文描述: 先进的交换式以太网控制器的10 10/100 BaseX(高级交换式10 10/100 BaseX以太网控制器)
文件页数: 129/135页
文件大小: 1619K
代理商: GT-48208
GT-482xx Switched Ethernet Controllers for 10+10/100 BaseX
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Revision 1.2
93
18.1.2 CPU Tx Low Desc1 and 2, Offset: 0x28, 0x2C
Tx Low Desc1 and Tx Low Desc2 registers have the same format as the CPU Tx High Desc registers. The New_
Address messages are always entered into the high descriptor, therefore the CPU Tx Low Desc2 register contains
only Packet_Descriptor messages (CPU Tx Low Desc2[30] = 0). . , , , , , , , , , ,
29:28
NaType
New Address Type:
00: New Address
01: Error Source Address
10: Address that was removed from the Address Table
due to aging
11: Reserved
30
DescType
Descriptor Type
0 - Packet descriptor
1 - New_Address message
31
Valid
Valid bit.
0 - CPU TX High1 and 2 do not contain valid data
1 - CPU TX High1 and 2 contain valid data.
Valid bit is cleared upon reading CPU Tx High Desc2.
Table 35: CPU EL Free Req, Offset: 0x30
B it s
Fie ld N ame
Funct ion
Initial Va lue
10:0
SourBufAddr
Source Buffer Address (divided by 0x600)
0x0
14:11
SourcePort
Source Port number
0x0
18:15
TrgPort
Target Port number
0x0
19
Mult
Multicast packet (1 - Multicast)
Note: The value of this bit must match the value of the
Mult bit (bit 26) in the CPU Tx High Desc1 (offset 0x20).
0x0
30:20
Reserved
31
Busy
Busy bit
0 - Not Busy, the CPU can re-load this register
1 - Busy - The data in this register was not processed.
The CPU should not re-load this register.
When the CPU writes this register to clear a buffer, it
should write this bit as ‘1’. Before the CPU proceeds to
clear another buffer, it should poll this bit until it has a
value of ‘0’.
0x0
Table 34: CPU Tx High Desc2 - New Address, Offset 0x24 (Continued)
B it s
Field N ame
Funct ion
Initial Va lue
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