PortalPlayer

PortalPlayer, founded in 1999, was a that supplied  semiconductors, firmware and software for. The company handled semiconductor design and firmware development, while subcontracting the actual to merchant. The company was acquired by Nvidia in 2007.

History
PortalPlayer gained recognition as the company with which Apple Computer contracted for development of the original iPod. The company went with an  in November 2004 and traded on the  under  PLAY. Sales to Apple grew to 90% of the company's gross revenue, which ultimately hurt the company when Apple switched media processor chip vendors in its iPod lines.

On November 6, 2006, Nvidia Corporation announced that it would acquire PortalPlayer for about $357 million. The acquisition was completed on January 5, 2007.

PortalPlayer 5002
Dual ARM7TDMI cores with shared SRAM (3x 32KB banks). Errata in memory controller leads to halved data cache performance but fast SRAM. As the ARM7TDMI does not support cache coherency, individual ARM7TDMI cores do not have coherent views of DRAM. Custom logic is used to introduce coherency into the SRAM. Used by the following devices:
 * iPod: Generations 1, 2 and 3

PortalPlayer 5003
System-on-a-chip containing two ARM7 CPU cores, each running at up to 90 MHz. Fixes 5002 cache bug greatly improving performance of DRAM. Used by:
 * 

PortalPlayer 5020
System-on-a-chip containing two ARM CPU cores, each running at 75 MHz. Expanded SRAM to 4 banks (128KB) using a crossbar style switch. Used by:
 * iPod: Generation 4, iPod Photo, and first generation iPod mini
 * HDD100/120 (unconfirmed)
 * Tatung Elio M310 (system/pp5020.mi4 contains the string "PP5020AF-05.11-TG01-11.40-TG01-11.40-DT" and "Copyright(c) 1999 - 2003 PortalPlayer, Inc.")
 * Virgin player 5GB (According to )
 * MSI Megaplayer 540, has firmware system/pp5020.mi4 including "PP5020AF..." string, in Germany it has been sold as Medion MD81034 by ALDI
 * , all variations, including the 5GB, 6GB, and 20GB models
 * Edirol R-1 (Unconfirmed rumor on what chip but unit displays "Powered by PortalPlay Inc. 1999-2004"
 * M-AUDIO Microtrack ver.1 " string pp5020d-tf"
 * MR-100

PortalPlayer 5021C-TDF
Used by the following devices:
 * iPod: First generation iPod Nano and  fifth generation iPod with video

PortalPlayer 5022
SRAM is no longer partitioned into fast and slower banks; all have uniform access speed. Used by:
 * iPod: Second generation iPod mini
 * HDD1630/HDD6320/HDD6330 > PP 5022 + codec Wolfson WM8731L

PortalPlayer 5024
PP5022 with integrated AS3514 DAC and power management chip. Used by:
 * 
 * SA9200

PortalPlayer APX
PortalPlayer's application processor series. Used by:
 * Microsoft
 * The current generation NVIDIA Tegra mobile processors