ADLINK Technology CoreModule 740 Reference Manual page 28

Chapter 3
Table 3-5. Utility 2 Interface Pin Signals (J4) (Continued)
26 IDE_PDD2
27 FDD_DS0
28 IDE_PDD13
29 GND15
30 IDE_PDD1
31 NC
32 IDE_PDD14
33 GND16
34 IDE_PDD0
35 FDD_DIR*
36 IDE_PDD15
37 GND17
38 GND1
39 FDD_STEP*
40 HD_KEY
41 GND18
42 IDE_PDDREQ
43 FDD_WDATA
44 GND2
45 GND19
46 IDE_PDIOW*
47 FDD_WGATE*
48 GND7
49 GND20
50 IDE_PDIOR*
51 FDD_TRK0*
52 GND6
53 GND21
54 IDE_PDIORDY
55 FDD_WPRT*
24
Primary Disk Data 2
Floppy Drive Select 0 – Selects drive 0
Primary Disk Data 13
Floppy Ground
Primary Disk Data 1
Not Connected
Primary Disk Data 14
Floppy Ground
Primary Disk Data 0
Floppy Direction – Direction of head movement (0 = inward motion, 1 =
outward motion)
Primary Disk Data 15
Floppy Ground
IDE Ground
Floppy Step – Low pulse for each track-to-track movement of the head
Not Connected
Floppy Ground
Primary DMA Channel Request – Used for DMA transfers between host
and drive (direction of transfer controlled by PIOR* and PIOW*). Used in
asynchronous mode with PDACK*. Drive asserts PDREQ when ready to
transfer or receive data.
Floppy Write Data – Encoded data to the drive for write operations
IDE Ground
Floppy Ground
Primary I/O 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.
Floppy Write Gate – Signal to the drive to enable current flow in the write
head
IDE Ground
Floppy Ground
Primary I/O Read 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.
Floppy Track 0 – Senses the head is positioned over track 0
IDE Ground
Floppy Ground
Primary I/O DMA 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.
Floppy Write Protect – Senses the diskette is write protected
Reference Manual
Hardware
CoreModule 740