Official Solution for HW 4 ----------------------------------------- PROBLEM 1. A. VPN: [13-6] VPO: [5-0] TLBT: [13-8] TLBI: [7-6] B. PPN: [11-6] PPO: [5-0] CT: [11-6] CI : [5-2] CO: [1-0] ----------------------------------------- PROBLEM 2. A. 00 0010 0111 1100 B. VPN: 0x9 TLBI: 0x1 TLBT: 0x2 TLB hit? N Page fault? N PPN: 0x17 C. 0101 1111 1100 D. CO: 0x0 CI: 0xF CT: 0x17 Cache hit? N Cache byte: - ----------------------------------------- PROBLEM 3. A. 00 0011 1101 0100 B. VPN: 0xF TLBI: 0x3 TLBT: 0x3 TLB hit? Y Page Miss? N PPN: 0xD C. 0011 0101 0100 D. CO: 0x0 CI: 0x5 CT: 0xD Cache hit? Y Cache byte: 0x36 ----------------------------------------- PROBLEM 4. Speeding up the processor will not reduce the bus traffic. Incorporating decompression into the graphics card will---the bus will only need to carry compressed viddeo. ----------------------------------------- PROBLEM 5. A. Video BW = 720 * 480 * 30 * 3 = 31,104,000 B/s = 30,375 KB/s = 29.66 MB/s Audio BW = 2 * 44100 * 2 = 176,400 B/s = 172 KB/s = 0.17 MB/s Total BW = 31,280,400 B/s = 30,547 KB/s = 29.83 MB/s B. 30,547 KB/s / 174 KB/s = 176X C. CDROM: 747 MB / 29.83 MB/s * 1/60 Min/Sec = 0.42 minutes DVD: 2*4.38*1024 MB / 29.83 MB/s * 1/60 Min/Sec = 5.01 minutes ----------------------------------------- PROBLEM 6. A. 30,375 KB/s / 440 KB/s = 69X B. 440 KB/s + 172 KB/s = 612 KB/s = 0.60 MB/s C. 612 KB/s / 174 KB/s = 3.5 ~= 4X D. CDROM: 747 MB / 0.60 * 1/60 Min/Sec = 21 minutes DVD: 2*4.38*1024 MB / 0.60 MB/s* 1/60 Min/Sec = 250 minutes -----------------------------------------