Device Comparison

The High Density (HD) FPGAs are embedded FPGAs built with the Skywater 130nm High Density Standard Cell library (Sky130_fd_SC_HD).

Table 1 Logic capacity of High Density (HD) FPGA IPs

Resource/Capacity	SOFA HD	QLSOFA HD	SOFA CHD
Look-Up Tables [1]	1152	1152	1152
Flip-flops	2304	2304	2304
Soft Adders [2]	N/A	1152	1152
Routing Channel Width [3]	40	60	60
Max. Configuration Speed [4]	50MHz	50MHz	50MHz
Max. Operating Speed [4]	50MHz	50 MHz	50MHz
User I/O Pins [5]	144	144	144
Max. I/O Speed [4]	33MHz	33MHz	33MHz
Core Voltage	1.8V	1.8V	1.8V

[1]

counted by 4-input fracturable Look-Up Tables (LUTs), each of which can operate as dual-output 3-input LUTs or single-output 4-input LUT.

[2]

counted by 3-input Look-Up Tables (LUTs) that are organized as a carry chain

[3]

counted by number of uni-directional routing tracks per tile

[4] (1,2,3)

bounded by the maximum speed of GPIO cells of Skywater 130nm PDK. Higher speed may be expected when a high-speed GPIO cell is available.

[5]

I/Os are divided into two groups: GPIOs and embedded I/Os.