Ampro ReadyBoar 800 Reference Manual page 37

Chapter 3
Pin # Signal
22 GND
23 PDIOW*
24 GND
25 PDIOR*
26 GND
27 PDIORDY Primary I/O Channel Ready – When negated extends the host transfer cycle of
28 PDCEL
29 PDDACK* Primary DMA Channel Acknowledge – Used by the host to acknowledge data
30 GND
31 IRQ14
32 NC
33 PDA1
34 PD33/66
35 PDA0
36 PDA2
37 PDCS1*
38 PDCS3*
39 IDE LED1 IDE Activity – Indicates IDE drive activity to yellow IDE LED (D5) on card edge.
40 GND
41 +5V
42 +5V
43 GND
44 NC
Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.
ReadyBoard 800
Description
Digital Ground
Primary Device I/O Read/Write Strobe – 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.
Digital Ground
Primary I/O Read/Write Strobe – 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.
Digital Ground
any host register access when the drive is not ready to respond to a data transfer
request. High impedance if asserted.
Primary Cable Select – Used to configure IDE drives as device 0 or device 1
using a special cable.
has been accepted or data is available. Used in response to DMARQ asserted.
Digital Ground
Interrupt Request 14 – Asserted by drive when it has pending interrupt (PIO
transfer of data to or from the drive to the host).
Not connected
Primary IDE ATA Disk Address (0 to 2) – Used to indicate which byte in the
ATA command block or control block is being accessed
UDMA 33/66 Sense – Senses which DMA mode to use for IDE devices.
Primary IDE ATA Disk Address (0 to 2) – Used to indicate which byte in the
ATA command block or control block is being accessed
Primary IDE ATA Disk Address (0 to 2) – Used to indicate which byte in the
ATA command block or control block is being accessed
Primary Slave/Master Chip Select 1 – Used to select the host-accessible
Command Block Register.
Primary Slave/Master Chip Select 3 – Used to select the host-accessible
Command Block Register.
Digital Ground
+5 volts +/-5%
+5 volts +/-5%
Digital Ground
Not connected
Reference Manual
Hardware
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