Mini-Peripheral Component Interface Bus For NoteBook Computers
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A Brief Description of the Mini Peripheral Component Interface 'MiniPCI' Bus.
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The Peripheral Component Interface 'PCI' Bus was originally developed as a local bus expansion slot for the Personal Computer, and was coined the PCI Local Bus. The specification started as an add-on to the ISA form factor with the PCI bus requiring its own slot. The PCI spec defines the Electrical requirements for the interface. No bus terminations are specified, the bus relies on signal reflection to achieve level threshold. The first Desk Top version of the PCI bus ran at 33MHz with a 32 bit bus (133MBps), the current Desk Top version runs at 66MHz with a 64 bit bus. The Lap-Top version [Mini-PCI] operates at 32MHz with a 32 bit bus. The PCI bus operates either synchronously or asynchronously with the "mother Board bus rate. While operating asynchronously the bus will operate at any frequency from 66MHz down to (and including) 0Hz. Flow control is added to allow the bus to operate with slower devices on the bus, allowing the bus to operate at their speed. PCI is an unterminated bus, the signal relay on signal reflections to attain there final value. The PCI interface is used in Desktop computers while the Mini PCI interface is used in Laptop or notebook computers. The Mini PCI specification uses a subset of the PCI signal set. Mini-PCI is a small form factor version of a PCI card. Because the Mini-PCI bus only uses 3.3 volts the boards do not require connector keying to indicate a 3.3v board or 5 volt board. However 5 volts is available for audio applications. Mini PCI only implements the 32-bit PCI bus, 64-bit data buses are not supported. There are three card configurations; Type I, Type II, and Type III cards. Type II cards have an RJ45 mounted connector, while Types I and III provide support for and RJ45 connector. The card edge connector used for each type include;Type I and II use a 100-pin connector, while Type III uses a 124-pin edge connector. The connector for Type I and II differ from Type III, which supports a card edge. |
Additional card sizes are defined to include Type I/II/IIIA and I/II/IIIB.
| PWB Size | Board Type | Board Form Factor |
|---|---|---|
| 100-Pin Stacking | IA | 7.5 x 70 x 45mm |
| 100-Pin Stacking | IB | 5.5 x 70 x 45mm |
| 100-Pin Stacking | IIA | 7.5 x 70 x 45mm |
| 100-Pin Stacking | IIB | 17.44 x 78 x 45mm |
| 124-Pin Card Edge | IIIA | 5.5 x 78 x 45mm |
| 124-Pin Card Edge | IIIB | 5 x 64.7 x 55.8mm |
| 124-Pin Card Edge | IIIA | 2.4 x 59.6 x 50.95mm |
| 124-Pin Card Edge | IIIB | 2.4 x 59.6 x 44.6mm |
The physical dimensions of the 124-Pin Mini PCI card is listed above, the
fingers run on the long edge.
MiniPCI Sizes listed are; Height x Length x Width
In addition to the PCI bus Mini PCI also provides for additional buses
including; an Audio bus, a power management bus, a LAN bus, and a Modem
bus.
These additional buses are not defined in other standards.
The Mini-PCI bus doesn't use Glue logic, being developed as a single chip interface bus. So signal chip solutions or ASIC parts are the only PCI chips listed below. PCI is a CMOS bus, with no current flowing in the static state. The Mini-PCI specification does not use +5 volt switching levels. The Mini-PCI specification uses a +3.3 volt interface with VIH = 1.65v, VOH = 2.97v
IC Manufacturers producing chips for the PCI bus are listed on the
PCI bus page.
Total power consumption is defined at 2 watts maximum for the Mini PCI board.
Peripheral Component Interconnect - Special Interest Group: PCISIG [http://www.pcisig.com]
PCI: The original specification 'Peripheral
Component Interface', @ Rev 2.1
Mini PCI: Specification @ Rev 1.0; PCI in a small form factor for
Laptops,
Mini PCI Express: PCI over a
differential serial link in a small form factor [card size] for
Laptops/Notbooks.
The PCI Express Bus: physical layer is not
compatible with the PCI bus listed on this page, or the PCI Bus page.
PCI Industrial Computer Manufacturers Group: PICMG, www.picmg.org
Note: the PCI bus has been ported to a number of different embedded or industrial card form factors, many different board types are listed on the main PCI page, or use the Buses icon at the bottom of the page to search for a particular embedded board form factor or bus type. Some buses use the PCI bus specification out-right, others change the form factor, some use a reduced pin-out, while others only use the minimum bus width of 32 bits ~ all PCI based.
The 100-pin connector is used with Type I and II cards and the 124-pin connector is used with Type III Mini-PCI cards.
MiniPCI does not support the JTAG interface, or the 64-bit version of the PCI standard.
A Mini-PCI connector accepts a card edge.
Two types of connectors are
defined for MiniPCI;
A 100-pin connector used with Type I and II cards and a 124-pin
connector used with Type III Mini-PCI cards.
The 124-Pin connector excepts a card edge, a board with fingers.
Molex {Type III Mini-PCI Connector Manufacturer}
Tyco Electronics {Mini-PCI Connector Manufacturer}
Maximum current capacity per pin is rated at 500 mA.
{Back to the MiniPCI Bus Index}
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