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MC9328MX1 Reference Manual
MOTOROLA
Memory Stick Host Controller (MSHC) Module
21.8 Programmer’s Reference
21.8.1 Memory Stick Serial Interface Overview
The Memory Stick Protocol requires 3 interface signal line connections for data transfers: MS_BS,
MS_SDIO, and MS_SCLKO (or MS_SCLKI). MS_PI [1:0] pin inputs detect insertion/removal of
Memory Stick. Communication is always started from the MSHC module and operates the bus in either
Four State Access or Two State Access mode.
MS_BS classifies data on SDIO into one of four states (BS0, BS1, BS2 or BS3) according to the attribute
and transfer direction. BS0 state has no packet communication going on while three states (BS1, BS2, and
BS3) have packet communication being executed. BS1 through BS3 are regarded as one packet and one
communication transfer is always completed within one packet (in Four State Access Mode).
Table 21-17. Memory Stick DMA Request Control Register Description
Name
Description
Setting
DRQEN
Bit 15
DMA Request Enable
—Enables/Disables operation of the
DMA request signal.
Note:
This bit must be set to 1 before initiating DMA
transfer.
0 = Disable DMA transfer requests
1 = Enable DMA transfer requests
Reserved
Bits 14–5
Reserved—These bits are reserved and should read 0.
RFF
Bit 4
Rx FIFO Full DMA Request
—Controls the DMA request
signal in case PID/APID is a read command.
Note:
This bit is effective only in case of DAKEN bit of
MSCS register is 1. When DAKEN is 0, MSHC module
generates DMA request in condition of RFF = 0. Therefore,
when user need to use in condition of RFF = 1, DAKEN bit
must be set to 1.
0 = Generate DMA request when
Rx FIFO has received at least
one half-word (use for DMA
transfer of 1 half-word (16 bits))
1 = Generate DMA request when
Rx FIFO is full (4 half-words)
Reserved
Bits 3–1
Reserved—These bits are reserved and should read 0.
TFE
Bit 0
Tx FIFO Empty DMA Request
—Controls the DMA request
signal in case of PID is a write command.
Note:
This bit is effective only in case of DAKEN bit of
MSCS register is 1. When DAKEN is 0, MSHC module
generates DMA request in condition of TFE = 0. Therefore,
when user need to use in condition of TFE = 1, DAKEN bit
must be set to 1.
0 = Generate DMA request when at
least 1 empty slot is available in
Tx FIFO (use for DMA transfer
of 1 half-word (16 bits))
1 = Generate DMA request when
Tx FIFO is empty
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