The following figure shows the Advanced tab of the DPUCZDX8G configuration.
- S-AXI Clock Mode
s_axi_aclkis the S-AXI interface clock. When Common with M-AXI Clock is selected,
s_axi_aclkshares the same clock as
s_axi_aclkport is hidden. When Independent is selected, a clock different from
m_axi_aclkmust be provided.
- dpu_2x Clock Gating
dpu_2xclock gating is an option for reducing the power consumption of the DPUCZDX8G. When the option is enabled, a port named
dpu_2x_clk_ceappears for each DPUCZDX8G core. The
dpu_2x_clk_ceport should be connected to the
clk_dsp_ceport in the dpu_clk_wiz IP. The
dpu_2x_clk_cesignal can shut down the
dpu_2x_clkwhen the computing engine in the DPUCZDX8G is idle. To generate the
clk_dsp_ceport in the
dpu_clk_wizIP, the clocking wizard IP should be configured with specific options. For more information, see the Reference Clock Generation section.
- DSP Cascade
- The maximum length of the DSP48E slice cascade chain can be set. Longer cascade lengths typically use fewer logic resources but might have worse timing. Shorter cascade lengths might not be suitable for small devices as they require more hardware resources. Xilinx recommends selecting the mid-value, which is four, in the first iteration and adjust the value if the timing is not met.
- DSP Usage
- This allows you to select whether DSP48E slices will be used for
accumulation in the DPUCZDX8G convolution module. When
low DSP usage is selected, the DPUCZDX8G IP will use
DSP slices only for multiplication in the convolution module. In high DSP usage mode, the DSP
slice will be used for both multiplication and accumulation. Thus, the high DSP usage consumes
more DSP slices and fewer LUTs. The additional logic resources required for High versus Low DSP
usage is shown in the following table:
Table 1. Additive Resource Utilization of High DSP Versus Low DSP Usage DPUCZDX8G Architecture Extra LUTs Extra Registers Extra DSPs 1 B512 1418 1903 -32 B800 1445 2550 -40 B1024 1978 3457 -64 B1152 1661 2525 -48 B1600 2515 4652 -80 B2304 3069 4762 -96 B3136 3520 6219 -112 B4096 3900 7359 -128
- Negative numbers imply a relative decrease.
- There are two kinds of on-chip memory resources in
devices: block RAM and UltraRAM. The
available amount of each memory type is device-dependent. Each block RAM consists of two 18K
slices which can be configured as 9b*4096, 18b*2048, or 36b*1024. UltraRAM has a
fixed-configuration of 72b*4096. A memory unit in the DPUCZDX8G has a width of ICP*8 bits and a depth of 2048. For the B1024
architecture, the ICP is 8, and the width of a memory unit is 8*8 bit. Each memory unit can
then be instantiated with one UltraRAM block. When the ICP is greater than eight, each memory
unit in the DPUCZDX8G needs at least two UltraRAM
The DPUCZDX8G uses block RAM as the memory unit by default. For a target device with both block RAM and UltraRAM, configure the number of UltraRAM to determine how many UltraRAMs are used to replace some block RAMs. The number of UltraRAM should be set as a multiple of the number of UltraRAM required for a memory unit in the DPUCZDX8G. An example of block RAM and UltraRAM usage is shown in the Summary tab section.
- When enabled, the DPUCZDX8G records the time that the DPUCZDX8G project was synthesized. When disabled, the timestamp keeps the value at the moment of the last IP update.