Cypress S6J3200 Series, Manual

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CHAPTER 22:Media Local Bus Interface (MediaLB)
S6J3200 Series Hardware Manual Document Number: 002-04852 Rev. *G 823
1.
Overview
The MediaLB comprises a MediaLB functional block, a AHB Master and Slave interface, and a 9Kbit RAM
for the local channel buffer. The MediaLB is an interface that implements the required functionality of a
Media Local Bus Device for connecting the device with a MOST (Media Oriented System Transport,
which is a multimedia-type in-vehicle LAN standard) network as outlined in reference MediaLB
Specification by SMSC (TB0400AN3V0, rev 3.0 issued on February 2006). The MediaLB transfers data
between the MediaLB Bus and the system memory, using the AHB Master Interface. In order to operate,
MediaLB configuration registers must be set via the AHB Slave Interface. The features of the MediaLB
module are listed in this section.
Features of the MediaLB

Implements the Physical and Link Layer requirements outlined in MediaLB Specification rev 3.0

Transmits commands and data when functioning as the transmitting device

Receives data and transmits status responses when functioning as the receiving device

Detection of the device lock or unlock from the MediaLB Frame.

Handling of System Channel commands

Supports 16 logical channels

Each logical channel can be programmed as synchronous, asynchronous, isochronous and control
channel type and as transmit or receive

Loop back mode between the logical channel 0 (reception) and logical channel 1(transmission)

Can operate in DMA mode (ping-pong buffering and circular buffering) and in IO mode

Built-in dual-port RAM as local channel buffer for compensating the bus latency

Supports 8-bit, 16-bit and 32-bit bus accesses to registers in MediaLB

Configurable protection for read and write accesses to registers in MediaLB

Programmable for 256Fs, 512Fs and 1024Fs transfer rates of operation at either 44.0kHz, 48.0kHz, or
48.1kHz.

3-pin MediaLB Mode