The Raspberry Pi SoC (System on Chip) is a Broadcom BCM http://www. The bottom bit doesn’t work as per specifications, and because the “0” . REFERENCES * REF1 * BCM ARM Peripherals 6 Feb Official documentation for the Raspberry Pi. Contribute to raspberrypi/ documentation development by creating an account on GitHub.

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Raspberry Pi Releases BCM2835 Datasheet for ARM Peripherals

Possibly the “choice” hasn’t been specified. This may happen every time this bit speciflcation set, but it is not measurable every time when sampling at 16MHz higher sampling speeds would be needed to confirm that.

How do these combine??? This is the correct way to do perripherals. If 0 the receiver shift register is cleared before each transaction.

Under rare situations this may result in “lost” clocks while MOSI still shifts out the data!

BCM datasheet errata –

The I2C section on page 34 mentions MHz as a “nominal core clock”. This had lead to a confusing picture. The partial datasheet was published here: This is from Geert Van Loos at the page below:.

Two bits high would be consistent with TX empty and RX empty. And by specifying “read: The register reads as 0x after reset. Speciification you expand the hardware the hardware may be enhanced and do “different things” if you write ones to the previously “reserved” bits.

The IO register is documented as 0x7ea0 with automatic deassert and 0x7eb0, whereas the table on page 8 shows 0x7e They should bcm28335 read “If this bit cleared no new symbols will be Therefore, the aim of this small test application project is to:. Allusions to the APB clock domain are made. Or the hardware does what I expect: However the exact speed of the APB clock is never explained.


I strongly suspect atm the CDIV counter is only 14 bits wide. This does not match the diagram on page – which shows this function is selected with alternative function 4. The “description” is then SPI In table the values in columns “min output freq” and “max output freq” should be in each others.

Raspberry Pi Releases BCM Datasheet for ARM Peripherals

Not adm an erratum, but not worth it to make a whole page for this. There is a bug in the I2C master that it does not support clock stretching at arbitrary points. Retrieved from ” https: Link to it via two control blocks on the primary chain. Navigation menu Personal tools Log in Request account. This page was last edited on 9 Julyat This is not true. Many datasheets specify “write: If 1 the data is shifted in starting with the MS bit.

BCM2835 datasheet errata

I dunno the official answer to this, but the community-written SPI drivers here and here set them both at the same time.

However, bits 7 and 9 does not match the original datasheet, nor my guess I think- not confirmed.

There is a space in ” full ” that would hint at that the word “half” was taken away. A detailed analysis of this bug can be found at http: There is amiguity on what register bits can be modified while the I2S system is active. Privacy policy About eLinux.


This is confusing as peripnerals there is a different module called SPI0 documented on page and onwards. Speification hardware was changed detecting “half full” was difficult? Views Read View source View history. If 1 the receiver shift register is NOT cleared.

That is the values in column “min output freq” are the maximum output frequency values and the values in column “max output arn are the minimum output frequency values [check: If you follow the datasheet, and write zeroes as specified to the reserved bits, the hardware guys can make sure you’re not going to run into surprises.

Does this mean, that the SYNC bit can also be changed at runtime as well? The CDIV value is documented as “must be a power of 2”. Some of the tables from the datasheet have been reproduced here. UART 1 should be: The divider is split between an cbm2835 divider and a fractional mashing divider. An easy implementation would implement the 0 value as the maximum divisor. The word sufficient is redundant when this is the “full and active” bit.