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Chapter 3 Hardware
XTX 820 Reference Manual 47
J4
Pin #
Signal 40-
Pin #
Description
GND 22 Ground
54 PIDE_IOW* 23 Drive I/O Write – 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.
GND 24 Ground
52 PIDE_IOR* 25 Drive I/O Read – 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.
GND 26 Ground
48 PIDE_RDY 27 I/O Channel Ready – When negated extends the host transfer cycle
of any host register access when the drive is not ready to respond to
a data transfer request. High impedance if asserted.
90 CBLID_P* 28 Cable ID Select – Used to detects the presence of an 80 conductor
IDE cable on the primary IDE channel. This allows BIOS or
system software to determine if is necessary to enable high-speed
transfer modes (DMA66 or DMA100).
46 PIDE_AK* 29 DMA Channel Acknowledge – Used by the host to acknowledge
data has been accepted or data is available. Used in response to
DMARQ asserted.
GND 30 Ground
44 PIDE_INTRQ 31
Drive Interrupt Request (IRQ 14)– Asserted by drive when it has
pending interrupt (PIO transfer of data to or from the drive to the
host).
NC NC 32 Not Connected
40 PIDE_A1 33 Drive Address Bus 1 – Used (0 to 2) to indicate which byte in the
ATA command block or control block (register) is being accessed.
NC PDIAG* 34 Not Connected (Passed Diagnostics)
38 PIDE_A0 35 Drive Address Bus 0 – Used (0 to 2) to indicate which byte in the
ATA command block or control block (register) is being accessed.
36 PIDE_A2 36 Drive Address Bus 2 – Used (0 to 2) to indicate which byte in the
ATA command block or control block (register) is being accessed.
32 PIDE_CS1* 37
Chip Select 1 – Used to select the host-accessible Command Block
Register.
30 PIDE_CS3* 38 Chip Select 3 – Used to select the host-accessible Command Block
Register.
NC DASP* 39 Not Connected (Drive Active/Drive Present)
GND 40 Ground
Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.