参数资料
型号: IP-POSPHY4
厂商: Altera
文件页数: 33/144页
文件大小: 0K
描述: IP POS-PHY L4
标准包装: 1
系列: *
类型: MegaCore
功能: POS-PHY 4 级接口,链路层/物理层
许可证: 初始许可证
Chapter 3: Parameter Settings
3–11
Optional Features
Each FIFO RAM block is implemented independently in the available device memory
(for example, with M512, M4K, or M9K blocks) and each device memory has a fixed
number of available configurations. The FIFO RAM block depth for small buffer
configurations (such as 128 × 36 of M4K memory) can be smaller than the minimum
configurable depth of the memory element, meaning that the remainder of the
memory is wasted. By using 2 FIFO RAM blocks instead of 4 you may get better
memory utilization. Figure 3–3 shows the comparison of FIFO RAM blocks.
Figure 3–3. Comparison of FIFO RAM Blocks
4 FIFO RAM Blocks
FIFO Block 0
(size = fifo_size/4)
FIFO Block 1
(size = fifo_size/4)
Write Side
2 FIFO RAM Blocks
Write Side
FIFO Block 2
(size = fifo_size/4)
FIFO Block 3
(size = fifo_size/4)
FIFO Block 0
(size = fifo_size/2)
Read Side
Read Side
FIFO Block 1
(size = fifo_size/2)
Both FIFO buffer width and FIFO buffer size affect memory utilization. The
improvement for a two block FIFO buffer configuration versus a four block FIFO
buffer configuration ranges from half the memory consumption for small buffers, to
the same memory consumption for large buffers.
Table 3–5 gives a comparison of the memory utilization for a Stratix II device with 4
FIFO RAM blocks versus 2 FIFO RAM blocks.
Table 3–5. Memory Utilization Comparison
(Note 1)
Buffer
Size
Atlantic Interface Width 32
Atlantic Interface Width 64
(bytes)
2 FIFO RAM Blocks 4 FIFO RAM Blocks
2 FIFO RAM Blocks
4 FIFO RAM Blocks
512
1,024
2,048
4,096
8,192
4 M4K
4 M4K
6 M4K
12 M4K
24 M4K
4 M4K + 4 M512
8 M4K
8 M4K
12 M4K
24 M4K
4 M4K + 2 M512
6 M4K
6 M4K
10 M4K
20 M4K
8 M4K + 4 M512
8 M4K + 4 M512
12 M4K
12 M4K
20 M4K
Note to Table 3–5 :
(1) Stratix II device, receive (Rx), shared buffer, data path width 32, parity enabled.
May 2013
Altera Corporation
POS-PHY Level 4 MegaCore Function User Guide
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