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 rese t 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 – Tie d High for Master/Slave handshake proto col.
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.