CardBus are 32-bit PCMCIA devices targeted to mobile computers.The smaller size of the PCMCIA cards can be used to implement normal desktop expansion boards (like wi-fi cards, modems or TV tuners) into a smaller form factor which may be inserted into a notebook computer. CardBus cards use only 3.3v VCC as their power supply. These cards are attached to their host system through 68-pin connector (with two rows of 34 pins, with 0.05 inch (1.27mm) spacing) , which is common to all PC Cards. There are different types of CardBus form factors, which differ only in thickness(sizes are TxLxW):

  • Type I: 3.3mm x 85.6mm x 54.0mm
  • Type II: 5.0mm x 85.6mm x 54.0mm
  • Type III: 10.5mm x 85.6mm x 54.0mm

Note that CardBus devices have shallower notch than the older 16-bit PC cards devices. This design prevents from inserting a 32-bit device into earlier equipment supporting only 16-bit devices, but a 16 bit card can be plugged into a 32 bit slot.

CardBus Connector Pin Out
Pin # Signal Name Pin Function Pin # Signal Name Pin Function
1 Ground —- 35 GND Ground
2 CAD0 Address/data bit 0 , I/O 36 CCD1 Card Detect 1
3 CAD1 Address/data bit 1, I/O 37 CAD2 Address/data bit 2, I/O
4 CAD3 Address/data bit 3, I/O 38 CAD4 Address/data bit 4, I/O
5 CAD5 Address/data bit 5, I/O 39 CAD6 Address/data bit 6, I/O
6 CAD7 Address/data bit 7, I/O 40 RFU Reserved for future use
7 CC/BE0 Byte Enable, I 41 CAD8 Address/data bit 8, I/O
8 CAD9 Address/data bit 9, I 42 CAD10 Address/data bit 10, I/O
9 CAD11 Address/data bit 11, I/O 43 CVS1 —, I
10 CAD12 Address/data bit 12, I 44 CAD13 Address/data bit 13, I/O
11 CAD14 Address/data bit 14, I 45 CAD15 Address/data bit 15, I/O
12 CC/BE1 Byte Enable 1, I 46 CAD16 Address/data bit 16, I/O
13 CPAR Parity Bit, I 47 RFU Reserved for future use
14 PERR Parity Error, I 48 CBCLOCK –
15 CGNT Bus arbitration grant, I 49 CSTOP –
16 CINT Ready/Bus , O 50 CDEVSEL Device Select
17 Vcc Supply Voltage 51 Vcc –
18 Vpp1 Programming Voltage 1 52 Vpp2 Programming Voltage 2
19 CCLK Bus clock, 0 to 33MHz 53 CTRDY –
20 CIRDY Ready, I 54 CFRAME Data Frame indicator
21 CC/BE2 Byte enable 2, I 55 CAD17 Address/data bit 17, I/O
22 CAD18 Address/data bit 18, I/O 56 CAD19 Address/data bit 19, I/O
23 CAD20 Address/data bit 20, I/O 57 CVS2 –
24 CAD21 Address/data bit 21, I/O 58 CRST Reset
25 CAD22 Address/data bit 22, I/O 59 CSERR System Reset
26 CAD23 Address/data bit 23, I/O 60 CREQ Arbitration Request
27 CAD24 Address/data bit 24, I/O 61 CC/BE3 Byte Enable 3
28 CAD25 Address/data bit 25, I/O 62 CAUDIO Card Audio Output, O
29 CAD26 Address/data bit 26, I/O 63 CSTSCHG –
30 CAD27 Address/data bit 27, I/O 64 CAD28 Address/data bit 28, I/O
31 CAD29 Address/data bit 29, I/O 65 CAD30 Address/data bit 30, I/O
32 RFU Reserved for future use 66 CAD31 Address/data bit 31, I/O
33 CCLKRUN –, O 67 CCD2 Card Detect 2
34 GND Ground 68 GND Ground
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