参数资料
型号: GT-48001A
厂商: Galileo Technology Services, LLC
英文描述: Switched Ethernet Controller For 10BaseX(10BaseX交换式快速以太网控制器)
中文描述: 交换式以太网控制器10BaseX(10BaseX交换式快速以太网控制器)
文件页数: 12/101页
文件大小: 1235K
代理商: GT-48001A
GT-48001A Switched Ethernet Controller
18
Revision 1.6
5.
GT-48001A Buffers and Queues
The GT-48001A incorporates nine transmit queues for the 8 Ethernet ports and the PCI bus port, and one common
receive buffer area (see Figure 2.) The receive buffers as well as the transmit queues are located in the DRAM along
with the Address Table. DRAM address mapping in the GT-48001A is shown in Table 3. The GT-48001A data struc-
ture components are the following:
Receive Buffer - A common Rx buffer area for all ports. The buffer is divided into 304 or 992 blocks (depend-
ing on the DRAM size) of 1.5KBytes (1536 bytes) each. Each block contains the entire packet.
Rx Empty List - A list of 304 or 992 bits. Each bit contains the status of its appropriate receive block in the
DRAM (empty or occupied).
Tx Descriptors - A set of 9 transmit descriptor rings. Each ring contains 1024 descriptors. The descriptor size
is one 32-bit word and contains the Block Address divided by 0x600 (1.5K), the byte count and the packet type
(Multicast or Unicast).
Read/Write Pointers - 9 pairs of pointers to the transmit descriptors.
Figure 2: GT-48001A Buffers and Queues
Read Pointer
Write Pointer
21
Byte Count Blk Addr
10 9
0
Frame #0
Frame #1
Frame #2
Rx Buffer (for all ports and PCI)
Tx Descriptors: 1024 X 9
Rx Empty List
DRAM
GT-48001A
M/U
20
Frame #n
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