参数资料
型号: CORE10/100-RM
厂商: Microsemi SoC
文件页数: 51/106页
文件大小: 0K
描述: IP CORE10/100 ETHERNET MAC
标准包装: 1
系列: *
Core10100 v4.0
Table 4-39 · Hash Table Setup Frame Buffer Format
Internal Operation
Byte Number
3:0
7:4
11:8
.
.
.
123:121
127:124
Data Bits 31:16
xxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxx
.
.
.
xxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxx
Data Bits 15:0
Hash filter (015:000)
Hash filter (031:016)
Hash filter (047:032)
.
.
.
Hash filter (495:480)
Hash filter (511:496)
131:128
135:132
.
.
.
159:156
163:160
167:164
171:168
175:172
.
.
.
183:180
187:184
191:188
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
.
.
.
xxxxxxxxxxxxxxxx Physical Address (15:00)
xxxxxxxxxxxxxxxx Physical Address (31:16)
xxxxxxxxxxxxxxxx Physical Address (47:32)
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
.
.
.
xxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxx
Internal Operation
The address bus width of the Receive/Transmit Data RAMs can be customized via the core parameters RFIFODEPTH
and TFIFODEPTH ( Table 3-1 on page 19 ). Those memory blocks must be at least as big as the longest frame used on
a given network. Core10100 stops to request new frame data when there are two frames already in the Transmit Data
RAM. It resumes the request for new frame data when there is either one or no frame in the Transmit Data RAM.
At any given time, the Receive Data RAM can hold no more than four frames, including frames currently under
transfer.
DMA Controller
The DMA is used to control a data flow between the host and Core10100.
The DMA services the following types of requests from the Core10100 transmit and receive processes:
? Transmit request:
Descriptor fetch
Descriptor closing
Setup packet processing
Data transfer from host buffer to transmit FIFO
? Receive request:
v4.0
51
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