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Chapter 3 Hardware
30 Reference Manual CoreModule 420
Pin # Signal Description
24 NC Not connected – (IOCS16* = I/O select 16 bit)
25 GND Digital Ground
26 NC Not Connected (Card detect)
27 D11 Disk Data 11 – Refer to pin 2, D3, for more information.
28 D12 Disk Data 12 – Refer to pin 2, D3, for more information.
29 D13 Disk Data 13 – Refer to pin 2, D3, for more information.
30 D14 Disk Data 14 – Refer to pin 2, D3, for more information.
31 D15 Disk Data 15 – Refer to pin 2, D3, for more information.
32 CE2* Card Enable 2 – This signal, along with CE1*, is used to select the
CompactFlash card and indicate to the card when a byte or word operation is
being performed. This signal always accesses the odd byte of the word.
33 NC Not Connected (VS1*)
34 IOR* I/O Read Strobe – This signal is generated by the host and gates the I/O data onto
the bus from the CompactFlash card when the card is configured to use the I/O
interface.
35 IOW* I/O Write Strobe – This signal is generated by the host and clocks the I/O data on
the Card Data bus into the CompactFlash card controller registers when the card
is configured to use the I/O interface. The clock occurs on the negative to
positive edge of the signal (trailing edge).
36 Vcc +5 volts ±5% power supply (WE)
37 RDY
Drive Ready – IRQ (IRQ 14) is asserted by drive (CF) when it has a pending
interrupt request (PIO transfer of data to or from the drive to the host).
38 Vcc +5 volts ±5% power supply
39 GND Grounded (CSEL)
40 NC Not Connected (VS2*)
41 IDERst*
IDE Reset – This input signal is the active low hardware reset from the host. If
this pin goes high, it is used as the reset signal. This pin is driven high at power-
up, causing a reset, and if left high will cause another reset.
42 IORDY
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.
43 NC Not Connected – (INPACK =Input Acknowledge)
44 REG* Registered/Common Memory Access – Tied High for Common Memory Access.
45 ACT/
SLV
Drive Active/Slave Present – Tied High for Master/Slave handshake protocol.
46 NC Not Connected (PDIAG = Passed Diagnostics)
47 D8 Disk Data 8 – Refer to pin 2, D3, for more information.
48 D9 Disk Data 9 – Refer to pin 2, D3, for more information.
49 D10 Disk Data 10 – Refer to pin 2, D3, for more information.
50 NC Not Connected (CD2)
Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.
NC = Not connected, NU = Not used.