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