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Chapter 3 Hardware
XTX 820 Reference Manual 53
Pin # Signal Description
50 VCC4 +5 volts +/-5%
51 NC Not Connected (SIDE_IOW*)
52 PIDE_IOR* Primary Drive I/O Read – Primary strobe signal for read functions.
Negative edge enables data from a register or data port of the drive onto the
host data bus. Positive edge latches data at the host.
53 NC Not Connected (SIDE_DRQ)
54 PIDE_IOW* Primary Drive I/O Write – Primary strobe signal for write functions.
Negative edge enables data from a register or data port of the drive onto the
host data bus. Positive edge latches data at the host.
55 NC Not Connected (SIDE_D15)
56 PIDE_DRQ Primary DMA Request – Used for DMA transfers between host and drive
(direction of transfer controlled by IOR* and IOW*). Also used in an
asynchronous mode with ACK*. Drive asserts an IRQ when ready to
transfer or receive data.
57 NC Not Connected (SIDE_D0)
58 PIDE_D15 Primary Disk Data 15 – These signals (0 to 15) provide the Primary IDE
disk data signals.
59 NC Not Connected (SIDE_D14)
60 PIDE_D0 Primary Disk Data 0 – Refer to pin-58 for more information.
61 NC Not Connected (SIDE_D1)
62 PIDE_D14 Primary Disk Data 14 – Refer to pin-58 for more information.
63 NC Not Connected (SIDE_D13)
64 PIDE_D1 Primary Disk Data 1 – Refer to pin-58 for more information.
65 GND5
Ground
66 GND7
Ground
67 NC Not Connected (SIDE_D2)
68 PIDE_D13 Primary Disk Data 13 – Refer to pin-58 for more information.
69 NC Not Connected (SIDE_D12)
70 PIDE_D2 Primary Disk Data 2 – Refer to pin-58 for more information.
71 NC Not Connected (SIDE_D3)
72 PIDE_D12 Primary Disk Data 12 – Refer to pin-58 for more information.
73 NC Not Connected (SIDE_D11)
74 PIDE_D3 Primary Disk Data 3 – Refer to pin-58 for more information.
75 NC Not Connected (SIDE_D4)
76 PIDE_D11 Primary Disk Data 11 – Refer to pin-58 for more information.
77 NC Not Connected (SIDE_D10)
78 PIDE_D4 Primary Disk Data 4 – Refer to pin-58 for more information.
79 NC Not Connected (SIDE_D5)
80 PIDE_D10 Primary Disk Data 10 – Refer to pin-58 for more information.
81 VCC5 +5 volts +/-5%
82 VCC6 +5 volts +/-5%