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Could USB ever take over PCI
Post 302843685 by verdepollo on Wednesday 14th of August 2013 11:59:02 AM
08-14-2013
Hardly -- For instance, PCI can transfer up to 16 GB/s whereas the most recent USB devices are peaking at 4-5 Gbps (~600 MB/s).
Nowadays most commercial PCI cards use 16 transfer lanes (known as PCI 16x) whereas USB has only two.
This also means that PCI buses are much larger than a USB slot. PCI is great for performance-critical scenarios while USB is great for portability.
It would definitely work, but there's no benefit from doing it that way other than 'for the sake of science'. 
Nowadays most commercial PCI cards use 16 transfer lanes (known as PCI 16x) whereas USB has only two.
This also means that PCI buses are much larger than a USB slot. PCI is great for performance-critical scenarios while USB is great for portability.
Quote:
why wouldn't this work?
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LEARN ABOUT FREEBSD
pccbb
PCCBB(4) BSD Kernel Interfaces Manual PCCBB(4) NAME
pccbb -- cardbus bridge driver SYNOPSIS
device cbb device pccard device cardbus device exca DESCRIPTION
The pccbb driver implements the Yenta specification for CardBus bridges. The following PCI cardbus and pcmcia bridges are supported: Cirrus Logic PD6832 Cirrus Logic PD6833 Cirrus Logic PD6834 O2micro OZ6812 O2micro OZ6832 O2micro OZ6833 O2micro OZ6836 O2micro OZ6860 O2micro OZ6872 O2micro OZ6912 O2micro OZ6922 O2micro OZ6933 O2micro OZ6972 O2Micro OZ711E1 O2Micro OZ711M1 Ricoh RL4C475 Ricoh RL4C476 Ricoh RL4C477 Ricoh RL4C478 TI PCI-1031 TI PCI-1130 TI PCI-1131 TI PCI-1210 TI PCI-1211 TI PCI-1220 TI PCI-1221 TI PCI-1225 TI PCI-1250 TI PCI-1251 TI PCI-1251B TI PCI-1260 TI PCI-1260B TI PCI-1410 TI PCI-1420 TI PCI-1450 TI PCI-1451 TI PCI-1510 TI PCI-1515 TI PCI-1520 TI PCI-1530 TI PCI-1620 TI PCI-4410 TI PCI-4450 TI PCI-4451 TI PCI-4510 TI PCI-4520 TI PCI-[67]x[12]1 TI PCI-[67]x20 ENE CB710 ENE CB720 ENE CB1211 ENE CB1255 ENE CB1410 ENE CB1420 Toshiba ToPIC95 Toshiba ToPIC95B Toshiba ToPIC97 Toshiba ToPIC100 TUNABLES
The driver supports the following tunable parameters, which may be added to /boot/loader.conf or set via the sysctl(8) command: hw.cbb.debug Non-zero values cause more verbose information to be printed to aid in debugging problems with the bridge chipset. SEE ALSO
cardbus(4), exca(4), pccard(4) BSD
July 21, 2004 BSD