参数资料
型号: ORSO42G5-EV
厂商: Lattice Semiconductor Corporation
文件页数: 69/153页
文件大小: 0K
描述: BOARD EVAL DEV PLATFORM ORSO42G5
标准包装: 1
系列: ORCA® 4 系列
类型: FPGA
适用于相关产品: ORSO42G5
所含物品: 板,线缆,电源
其它名称: ORSO42G5EV
Lattice Semiconductor
ORCA ORSO42G5 and ORSO82G5 Data Sheet
22
Since this effect is predictable for a given type of PCB material, it is possible to compensate for this effect in two
ways - transmitter preemphasis and receiver equalization. Each of these techniques boosts the high frequency
components of the signal but transmit preemphasis is preferred due to the ease of implementation and the better
power utilization. It also gives a better signal-to-noise ratio because receiver equalization amplies both the signal
and the noise at the receiver.
Applying too much preemphasis when it is not required, for example when driving a short backplane path, will also
degrade the data eye opening at the receiver. In the ORSO42G5 and ORSO82G5, the degree of transmit preem-
phasis can be programmed per channel with two control register bits as shown in Table 4. The high-pass transfer
function of the preemphasis circuit is given by the following equation, where the value of a is shown in Table 4.
H(z) = (1 – az
–1)
Table 4. Preemphasis Settings
SERDES Receive Path
The receiver section receives high-speed serial data at its differential CML input port. These data are fed to the
clock recovery section which generates a recovered clock and retimes the data. Each SERDES receive channel
has its own PLL and this means that the receive clocks are asynchronous between channels. This also enables
each receive channel to either operate in half-rate or full-rate mode.The retimed data are deserialized and pre-
sented as a 8-bit parallel data on the output port. Two-phase receive byte clocks (RBC0 and RBC1) are available
synchronous with the parallel words. RBC0 has its rising edge aligned to the center of the receive byte. RBC1 has
its falling edge aligned to the center of the receive byte. The 8-bit data (LDOUT) as shown in Figure 8, changes on
a single clock edge (rising edge of RBC0 or falling edge of RBC1).
Figure 8. SERDES Receive Path Timing
PE1
PE0
Amount of Preemphasis (a)
0
0% (No Preemphasis, Default)
0
1
12.5%
1
0
12.5%
1
25%
.....
LDOUT[7:0]
RBC0x
RBC1x
q
7
r
1
r
0
s
7
p
3
p
2
p
1
p
0
.....
p
7
p
6
p
5
p
4
r
7
r
6
r
5
r
4
r
3
r
2
s
6
s
5
s
4
s
3
p
HDINx
LDOUT[7:0]
1-bit
8-bit
.....
LATENCY
p
q
r
s
SETUP
HOLD
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