PCMCIA 32 bit Bus

Personal Computer Memory Card International Association

[Cardbus Description] [Interface ICs]
[Cardbus Standard Organizations]
[CardBus PinOut] [PCMCIA Connectors]
[PCMCIA Card Manufacturers]

CardBus Description

PCMCIA Defines both the Electrical and Physical specifications for a 68 pin interface residing in one of 3 form factors, which differ only in thickness;

Type I: 3.3mm x 85.6mm x 54.0mm (TxLxW), Version 2.1 allows the length to increase 50mm to 135mm
Type II: 5.0mm x 85.6mm x 54.0mm (TxLxW), Version 2.1 allows the length to increase 50mm to 135mm
Type III: 10.5mm x 85.6mm x 54.0mm (TxLxW)

CardBus operates over 32 bits at 33MHz [multiplexed address/data path].
It's called CardBus when implementing the local PCI bus (32 data bits only).
The peak data transfer rate is 132MBps [synchronous burst-transfer orientation]. CardBus Uses only 3.3v VCC as the power supply.
Cardbus devices may act as either [System-Bus] Master or Slave, while 16-bit PC Card devices may only act as slaves.
CardBus is fully backward compatible with the older PCMCIA [PC-card design]; however there may be some compatibility issues with the early versions of the PCMCIA standards.
The implementation of this spec based on the ISA bus is termed the PC Card A 8/16 bit data bus, 26 address lines, no bus mastering operating at ISA Bus speeds (8 MHz) using an ISA-like asynchronous protocol. How ever CardBus offers newer technology with a faster and wider bus, providing higher through-put.

Miniature Card is a smaller implementation of PCMCIA. Miniature Cards dimensions are: 3.5mm x 33mm x 38mm (TxLxW). The electrical specifications are a subset of the PC Card standard, restricted to memory applications only. It uses a 16-bit data bus and a 24-bit address bus to allow a single card to store up to 64MB.

CardBus Applications: Memory Card, Modem [RJ11 interface] Card, Wireless Interface, Ethernet Interface [RJ45], CompactFlash card reader [with a adaptor].

Comparison of Memory Card sizes with Board Dimension

{CardBus Index}

PCMCIA Standard Organizations

Personal Computer Memory Card International Association [appears to be gone]

{CardBus Index}

PCMCIA Bus Interface ICs

Zilog {PCMCIA / Storage Controller IC}

IC Manufacturers {All other device types}

{CardBus Index}

PCMCIA Connector Manufactures

PCMCIA devices; both CardBus and PC card use a 68 pin connector, with two rows of 34 pins, @ 0.05 inch spacing. Female pins are used on the card side. The power and ground pins are longer than the signal lines, allowing them to make connect first.

Connector Vendors:

AVX {PCMCIA PC Memory Card Connector}

Foxconn Electronics {136 pos. PCMCIA / CardBus connector, 68 pos. PCMCIA / CardBus connector}

Methode Electronics Inc. {CardBus case and connectors, Frame Kits

Molex Inc. {Cardbus, PC card}

OUPIIN America Inc. {Smart Card and PCMCIA Connectors}

Tyco Electronics

{PCMCIA Cardbus Index}

Cardbus, PinOut

CardBus Interface Signal Assignments (Pinout)

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

The Cardbus pinouts are defined for a 68 pin connector; 2 rows of 34 pins. From the table above:
I: is Input, toward the card
O: is Output, output from the card
I/O: is Input or Output, bidirectional to-and-from the card

{Back to PCMCIA Cardbus Index}

PC motherboard

Distributor rolodex Electronic Components Electronic Equipment EDA CDROM Software Engineering Standards, BOB card Cabled Computer Bus Electronic Engineering Design Table Conversion DB9-to-DB25.
DistributorsComponents Equipment Software Standards Buses Design Reference

Modified 6/13/15
Copyright © 1998 - 2016 All rights reserved Larry Davis