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: 53/135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
Figure 3: GT-482xx Buffers and Queues
5.1
Rx Buffer Threshold Programming
The number of receive buffers allocated to each port of the GT-482xx is controlled by the RxBufThr fields in the Rx
Buffer Threshold registers. The default value is 32 (10Mbps) or 64 (100Mbps) buffers per port for 1MB DRAM and
64 (10Mbps) or 592 (100Mbps) buffers per port for 4MB DRAM. If the buffer threshold is disabled by clearing the
Table 4:
GT-482xx DRAM Address Mapping
Memor y
D escr ipt io n
1 Mbyt e
4 Mbyt e
Rx Buffers
512 buffers for 1Mbyte
2048 buffers for 4 Mbyte
0x00000 - 0xBFFFF
0x00000 - 0x2FFFFF
Multicast Indicators
4 bytes per buffer
0xC0000 - 0xC07FF
0x300000 - 0x301FFF
Tx Descriptors
28 descriptor queues
0xC0800 - 0xCE7FF
0x302000 - 0x339FFF
CPU Descriptors
2 descriptor queues
0xCE800 - 0xD6800
0x33A000 - 0x341FFF
Reserved
-
0xD0800 - 0xE7FFF
0x342000 - 0x39FFFF
Address Table
2K addresses for 1Mbyte
8K addresses for 4Mbyte
0xE8000 - 0xFFFFF
0x3A0000 - 0x3FFFFF
Read Pointer
Write Pointer
21
Byte Count
Blk Addr
10 9
0
Frame #0
Frame #1
Frame #2
Receive Buffer
Tx Descriptors: 512/2048 X 30
Rx Empty List
DRAM
GT-48212
M/U
20
Frame #n
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