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COREDES-EV Datasheet(PDF) 7 Page - Actel Corporation |
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COREDES-EV Datasheet(HTML) 7 Page - Actel Corporation |
7 / 12 page CoreDES v4.0 7 Decryption To begin the process of decrypting data, the following inputs are set: 1. K[1:64] is set to the cipher key (ck1 in Figure 7) to decrypt the data. 2. D[1:64] is set to the ciphertext data (d1 in Figure 7) to be decrypted. 3. ED is set to logic '0'. 4. EN is set to logic '1'. After 16 clock cycles of the EN input being held continuously at a logic '1' value, the QVAL signal will transition from logic '0' to logic '1' and remain valid for one clock cycle, indicating that valid plaintext (unencrypted data shown as q1 Figure 7) is available on the Q[1:64] outputs. Figure 7 • Example Decryption Sequence CLK K[1:64] D[1:64] ED EN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 cycle Q[1:64] QVAL q1 ck1 d1 Don't care Undefined |
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