Table 4 Hardware utilization, maximum speed, and average error of proposed Exp CORDIC implementations for different numbers of n_exp iterations.

From: Digital design of a spatial-pow-STDP learning block with high accuracy utilizing pow CORDIC for large-scale image classifier spatiotemporal SNN

Implementation in 11-bits

LUT

Register slice

DSP

Max speed

Average error

Exp CORDIC with 2 iterations

330

0

0

768 MHz

6.76 × 10–2

Exp CORDIC with 3 iterations

370

0

0

769 MHz

1.83 × 10–2

Exp CORDIC with 4 iterations

370

0

0

769 MHz

5.67 × 10–3

Exp CORDIC with 5 iterations

326

0

0

768 MHz

5.63 × 10–3

Exp CORDIC with 6 iterations

330

0

0

685 MHz

6.44 × 10–3

Exp CORDIC with 7 iterations

349

0

0

685 MHz

1.00 × 10–2

  1. The bold one is the selected architecture.