Fast Models Reference Manual - ARM Information Center

Peripheral and Interface Components
Figure 5-37 PL180_MCI in System Canvas
This component is written in LISA+.
Ports
Table 5-61 provides a brief description of the ports.
Table 5-61 PL180_MCI ports
Name Port protocol Type Description
pvbus PVBus Slave Slave port for connection to PV bus
master/decoder.
MCIINTR[0-1] Signal Master Interrupt request ports.
mmc_m MMC_Protocol Master The Multi Media Card (MMC) master
port.
MMC_Protocol
The PL180_MCI component has one additional protocol.
MMC_Protocol describes an abstract, untimed interface between an MMC controller and an
MMC or SD card. The protocol contains a number of methods that must be implemented by the
master (controller) and some that must be implemented by the slave (card). This protocol is used
by the reference PL180 MCI and MMC models. Further information on the protocol
implementation can be found in the source file. See %PVLIB_HOME%\LISA\MMC_Protocol.lisa.
Use of this protocol assumes some knowledge of the MultiMediaCard specification, available
from the MultiMediaCard Association, www.mmca.org.
MMC_Protocol has the following behaviors:
cmd
Commands are sent from the controller to the card using this behavior, which is
implemented by the card model. The MMC command is sent with an optional
argument. The card responds as defined by the MMC specification. The
controller model checks that the response type matches expectations, and updates
its state appropriately. The transaction-level protocol does not model start/stop
bits or CRCs on the command/response payload.
For data transfer in the card to controller direction, the behaviors are:
Rx After the host and controller have initiated a read through the command interface,
the card calls the Rx behavior on the controller to provide the read data. The call
provides a pointer and a length. The ARM MMC reference model simulates
device read latency by waiting a number of clock cycles prior to calling this
behavior. If the controller is unable to accept the data, or wants to force a protocol
error, it can return false in response to this behavior.
Rx_rdy A handshake, used by the controller to inform the card that the controller is ready
to receive more data. The ARM MMC reference model does not time out, so waits
indefinitely for this handshake in a multiple block data transfer.
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