iPad equipped to deliver richer graphics
The 64bit path between the A4 processor and main memory provides twice the memory bandwidth as in the iPhone and iTouch (Click on image to view teardown).
UBM TechInsights' teardown of the Apple iPad found it has an unusually high processor-to-memory channel, an abundance of touchscreen silicon and a novel case design. The report shows Samsung and Broadcom are among the major silicon suppliers in the system.
Apple's A4 processor is the most significant chip in the iPad, and holds the biggest surprise found in the teardown. The chip sports a 64bit path to main memory, twice the width of the memory buses used on Apple iPhone and iPod Touch devices, "indicative of the need for richer graphics" in the iPad, said David Carey, VP of technical intelligence at UBM TechInsights and author of the report.
Samsung also supplied NAND flash used in the 64Gbyte iPad Carey examined. Toshiba supplied flash in other models.
The iPad uses three touchscreen chips instead of one typically found in an iPhone or iPod Touch. Both Broadcom controllers used in past Apple systems—the BCM5974 and BCM5973—make an appearance here, along with a Texas Instruments analog chip.
The number of touchscreen chips is "not all that surprising given the size and resolution of the display," said Carey.
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