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Logic Engine User Manual 37
4. ED PLD
4.1. Introduction
The ED PLD Tool is a PLD fuse map editor with the capability to read, burn, verify, and test
PLDs using the PLD burner on the Logic Engine Board. ED PLD supports only the Cypress PLD
C 20G10 at this time.
4.2. Cypress PLD C 20G10
The 20G10 is a 24 pin PLD with 12 input pins and 10 I/O pins. Each of the 10 output cells can be
configured as registered or combinational outputs, true high or true low outputs, and product term
or pin 13 output enable signals. The registered outputs are clocked by input pin 1. The fuse
matrix consists of 44 signals (12 input, 10 output feedbacks, and their compliments). Each output
cell has 9 product terms, 1 output enable term and 8 terms feeding an OR-gate. The functional
logic diagram of the PLD C 20G10 is shown in Fig. 1 and the eight possible configurations of the
output cells are shown in Table 1 and Figs. 2-3. For more information on the PLD C 20G10, con-
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