COM Express Interfaces
2.24. IDE and CompactFlash (PATA)
2.24.1. Signal Definitions
Type 2 and 4 COM Express Modules provide a single channel IDE interface supporting two
standard IDE hard drives or ATAPI devices with a maximum transfer rate of ATA100 (Ultra-DMA-
100 with 100MB/s transfer rate). The corresponding signals can be found on the Module
connector rows C and D.
Table 50: Parallel ATA Signal Descriptions
Signal Pin Description I/O IDE40 IDE44 CF
IDE_D0 D7 Bidirectional data to / from IDE device. I/O 3.3V 17 17 21
IDE_D1 C10 Bidirectional data to / from IDE device. I/O 3.3V 15 15 22
IDE_D2 C8 Bidirectional data to / from IDE device. I/O 3.3V 13 13 23
IDE_D3 C4 Bidirectional data to / from IDE device. I/O 3.3V 11 11 2
IDE_D4 D6 Bidirectional data to / from IDE device. I/O 3.3V 9 9 3
IDE_D5 D2 Bidirectional data to / from IDE device. I/O 3.3V 7 7 4
IDE_D6 C3 Bidirectional data to / from IDE device. I/O 3.3V 5 5 5
IDE_D7 C2 Bidirectional data to / from IDE device. I/O 3.3V 3 3 6
IDE_D8 C6 Bidirectional data to / from IDE device. I/O 3.3V 4 4 47
IDE_D9 C7 Bidirectional data to / from IDE device. I/O 3.3V 6 6 48
IDE_D10 D3 Bidirectional data to / from IDE device. I/O 3.3V 8 8 49
IDE_D11 D4 Bidirectional data to / from IDE device. I/O 3.3V 10 10 27
IDE_D12 D5 Bidirectional data to / from IDE device. I/O 3.3V 12 12 28
IDE_D13 C9 Bidirectional data to / from IDE device. I/O 3.3V 14 14 29
IDE_D14 C12 Bidirectional data to / from IDE device. I/O 3.3V 16 16 30
IDE_D15 C5 Bidirectional data to / from IDE device. I/O 3.3V 18 18 31
IDE_A[0:2] D13-D15 Address lines to IDE device. O 3.3V 35, 33, 36 35, 33, 36 20, 19, 18
IDE_IOW# D9 I/O write line to IDE device. O 3.3V 23 23 35
IDE_IOR# C14 I/O read line to IDE device. O 3.3V 25 25 34
IDE_REQ D8 IDE device DMA request. It is asserted by
the IDE device to request a data transfer.
I 3.3V 21 21 37
IDE_ACK# D10 IDE device DMA acknowledge. O 3.3V 29 29 44
IDE_CS1# D16 IDE device chip select for 1F0h to 1FFh
range.
O 3.3V 37 37 7
IDE_CS3# D17 IDE device chip select for 3F0h to 3FFh
range.
O 3.3V 38 38 32
IDE_IORDY C13 IDE device I/O ready input. Pulled low by
the IDE device to extend the cycle.
I 3.3V 27 27 42
IDE_RESET# D18 Reset output to IDE device, active low. O 3.3V 1 1 41
IDE_IRQ D12 Interrupt request from IDE device. I 3.3V 31 31 43
IDE_CBLID# D77 Input from off-Module hardware indicating
the type of IDE cable being used. High
indicates a 40-pin cable used for legacy
IDE modes. Low indicates that an 80-pin
cable with interleaved grounds is used.
Such a cable is required for Ultra-DMA 66,
100 modes.
I 3.3V 34 34 46
DASP 39 39 45
GND 2, 19, 22, 24,
26, 30, 40
2, 19, 22, 24,
26, 30, 40,
43
17, 16, 15,
14, 12, 11,
10, 8, 12, 6,
9, 33, 25, 26
39 (master)
PICMG
®
COM Express
®
Carrier Board Design Guide Rev. 2.0 / December 6, 2013
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