Công Nghệ Máy Tính - Lắp Ráp, Sửa Chữa Máy Tính part 16

Tham khảo tài liệu 'công nghệ máy tính - lắp ráp, sửa chữa máy tính part 16', công nghệ thông tin, phần cứng phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 92 NGUYỄN CƯỜNG THÀNH A28 SA3 Address bit 3 Out A29 SA2 Address bit 2 Out A30 SA1 Address bit 1 Out SAG Address bit 0 Out BIGROUND . B2 RESET DRV Active high low reset Out or Initialize system logic B3 5Vdc B4 IRQ9 Interrupt request 9 In B5 -5Vdc B6 DRQ2 DMA request 2 In B7 -12Vdc B8 -CARD SLCTD Card selected In activated by cards In XT s slot J8 B9 12Vdc BIO GROUND Bll -MEMW Memory write Out B12 -MEMR Memory read Out B13 -IOW I O write In Out B14 -IOR I O read In Out B15 -DACK3 DMA acknowledge 3 Out BIG DRQ3 DMA request 3 In B17 -DACK1 DMA acknowledge 1 Out B18 DRQ1 DMA request 1 In B19 -REFRESH Refresh In Out HƯỚNG DẪN Tự LAP RÁP VĂ SỬA CHỮA MẢY TÍNH. 93 B20 CLOCK System clock 67 ns 6 or 8MHz 50 duty cycle Out B21 IRQ7 Interrupt request 7 In B22 IRQ6 Interrupt request 6 In B23 IRQ5 Interrupt request 5 In B24 IRQ4 Intertupt request 4 In B25 IRQ3 Interrupt request 3 In B26 -DACK2 DMA acknowledge 2 Out B27 T C Terminal count pulses high when DMA term count reached Out B2S ALE Address latch enable Out B29 5Vdc B30 OSC High-speed clock 70 ns 50 duty cycle Out B31 GROUND 16-bit AT extension Cl SBHE System bus high enable data available on SD8-15 In Out C2 LA23 Address bit 23 unlatched In Out C3 LA22 Address bit 22 unlatched In out C4 LA21 Address bit 21 unlatched In Out C5 LA20 Address bit 20 unlatched In Out C6 LA19 Address bit 19 unlatched In Out 94 NGUYÊN CƯỜNG THÀNH C7 LA18 Address bit 18 unlatched In Out C8 LA17 Address bit 17 unlatched InZOut C9 -MEMR Memory read active on all memory read cycles In Out CIO -MEMW Memory write active on all memory write cycles In Out Cll SD08 Data bit 8 In Out C12 SD09 Data bit 9 In Out C13 SD1O Data bit 10 In Out C14 SD11 Data bit 11 In Out Clõ SD12 Data bit 12 In Out C16 SD13 Data bit 13 In Out C17 SD14 Data bit 14 In Out C18 SD15 Data bit 15 In Out DI -MEM CS16 Memory 16-bit chip select 1 wait 16-bit memory cycle In D2 -I O CSI6 I O 16-bit chip select 1 wait 16-bit I O cycle In D3 IRQ10 Interrupt request 10 In .