HCS08 datasheet(311/374 Pages) NXP

311 / 374 page

Universal Serial Bus Device Controller (S08USBV1)

MC9S08JM60 Series Data Sheet, Rev. 5

Freescale Semiconductor

311

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Bit stuffing violation

If a properly formatted packet is received, the receiver logic initiates a handshake response to the host. If

the packet is not decoded correctly due to bit stuff violation, CRC error or other packet level problem, the

receiver ignores it. The USB host will eventually time-out waiting for a response, and retransmit the

packet.

When the SIE receiver logic is receiving data in the buffer space for a particular endpoint, CPU access to

that buffer space is not recommended.

17.4.1.2

MCU/Memory Interfaces

17.4.1.2.1

SkyBlue Gasket

The SkyBlue gasket connects the USB module to the SoC internal peripheral bus. The gasket maps

accesses to the endpoint buffer descriptors or the endpoint buffers into the shared RAM block, and it also

maps accesses to the peripherals register set into the serial interface engine (SIE) register space. The

SkyBlue gasket interface includes registers to control the USB transceiver and voltage regulator.

17.4.1.2.2

Endpoint Buffer Manager

Each endpoint supported by the USB device transmits data to and from buffers stored in the shared buffer

memory. The serial interface engine (SIE) uses a table of descriptors, the Buffer Descriptor Table (BDT),

which is also stored in the USB RAM to describe the characteristics of each endpoint. The endpoint buffer

manager is responsible for mapping requests to access endpoint buffer descriptors into physical addresses

within the USB RAM block.

17.4.1.2.3

RAM Arbitration

The arbitration block allows access to the USB RAM block from the SkyBlue gasket block and from the

SIE.

17.4.1.3

USB RAM

The USB module includes 256 bytes of high speed RAM, accessible by the USB serial interface engine

(SIE) and the CPU. The USB RAM runs at twice the speed of the bus clock to allow interleaved

non-blocked access by the CPU and SIE. The USB RAM is used for storage of the buffer descriptor table

(BDT) and endpoint buffers. USB RAM that is not allocated for the BDT and endpoint buffers can be used

as system memory. If the USB module is not enabled, then the entire USB RAM may be used as unsecured

system memory.

17.4.1.4

USB Transceiver (XCVR)

The USB transceiver is electrically compliant to the Universal Serial Bus Specification 2.0. This block

provides the necessary 2-wire differential NRZI signaling for USB communication. The transceiver is

on-chip to provide a cost effective single chip USB peripheral solution.

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