# CS代考 Project Overview – cscodehelp代写

Project Overview

What do you need to design
¡ñ 9-bit Processor:

Instruction Set Architecture
(a) Instruction Set: Lab 1 (b) Architecture: Lab 2
¡ñ Program:
Machine Code: Lab 3

Instruction Set (Lab 1)
C code: A = B + C + D;
Assembly (MIPS):
Machine Code:
00000010001100100100000000100000 00000001000100111000000000100000

Different types of ISA

Architecture (Lab 2)

You might need LUT

Program 1: Encryption
256 Byte Data Memory, 1 Byte = 8 bit
DataMem[0: 51]: Original input Message
DataMem: N of prepending space char
DataMem: LFSR tap pattern
DataMem: LFSR Starting State
DataMem[64:64+N]: Encrypted Prepending Space
DataMem[64+N:127]: Encrypted Message + Encrypted Appending Space
10 <= N <= 15 If N > 15, N = 15 If N < 10, N = 10 Dest[i] = (Source[i] - 0x20) ^ curr_LFSR curr_LFSR = (curr_LFSR<<1)|(^(curr_LFSR & taps)) DataMem[64:128]: Parity Bit ¡ú ^[6:0] DataMem[64:128][6:0]: Encrypted Message 7 bit LFSR Program 2: Decryption DM[X] = DM[64+X] ^ curr_LFSR + 0x20 DataMem[0:63]: Decrypted Message DataMem[64:127]: Encrypted Message Use DM to calculate LFSR starting state Loop through all 9 LFSR Tap pattern, do the decryption, and compare with DM[64:73], see which pattern is able to produce 10 ASCII space. Do the decryption Program 3: Upgraded Decryption You will basically repeat Program 2 with some additional refinement Difference with Program 2: 1. Remove all initial space, until a non space character. Then store the non space characters from DM(assuming no error) 2. Calculate the parity bit. Does DM[64 + X] == ^DM[64 + X][6:0]? ¡ñ If yes, then store the decrypted char into DM[X] ¡ñ If no, then store error flag 0x80 into DM[X] 程序代写 CS代考 加微信: cscodehelp QQ: 2235208643 Email: kyit630461@163.com