参数资料
型号: IP-POSPHY4
厂商: Altera
文件页数: 52/144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
4–12
Chapter 4: Functional Description—Receiver
Reset Structure
the SPI-4.2 data rate is 200 Mbps. Most of the quarter-rate receiver MegaCore function
runs off rdint_clk , including all data path processors and the write side of the FIFO
buffer. Figure 4–5 shows the clocking structure used by the receiver MegaCore
function, for 32-bit (quarter-rate mode) variations that use the ALTDDIO_IN
megafunction.
Figure 4–5. Clock Layout Diagram (Quarter Rate)
rdint_clk
a0_arxclk
rdat[15:0]
rctl
ALTDDIO_IN
Data
Processor
Atlantic
Buffer 0
Atlantic
Interface 0
rdclk
ctl_rx_pll_areset
stat_rx_pll_locked
EPLL
( Note 4 )
Atlantic
Buffer N
aN_arxclk
( Note 2, 3 )
Atlantic
Interface N
rsclk
rstat[1:0]
ALTDDIO_OUT
2
Status
Processor
rxsys_clk
( Note 1 )
Notes to Figure 4–5 :
(1) rxsys_clk is internally connected to rdint_clk in 32-bit shared buffer with embedded addressing mode variations.
(2) The single clock mode removes the separate Atlantic clocks.
(3) The embedded address mode has only one buffer; the individual buffers mode can have more than one buffer.
(4) In 32-bit (quarter-rate) SPI-4.2 mode, this PLL only provides a phase shift for the incoming rdclk .
Requirements for rxsys_clk
The MegaCore function’s protocol logic and all Atlantic FIFO buffers share a common
clock called rxsys_clk that clocks both the write and optionally the read side of the
Atlantic FIFO buffers.
Table 4–2 shows guidelines for the frequency of rxsys_clk .
Table 4–2. Frequency Guidelines—rxsys_clk
Data Path Width
(Bits)
32
64
128
Worst Case Frequency Requirement
1.0 × rdint_clk
1.25 × rdint_clk
1.6 × rdint_clk
f For detail on the optimum setting of rxsys_clk , refer to Chapter C, Optimum
Reset Structure
By default, the rxreset_n signal is the asynchronous global reset for the MegaCore
function. It is internally metastable hardened and passed to each of the individual
clock domains.
POS-PHY Level 4 MegaCore Function User Guide
May 2013 Altera Corporation
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