13-4
MC9328MX1 Reference Manual
MOTOROLA
DMA Controller
13.3.1 Big Endian and Little Endian
The BIG_ENDIAN signal determines the MC9328MX1 memory endian configuration. BIG_ENDIAN is a
static pin to the processor and if it is driven logic-high at power on reset the processor's memory system is
configured as big endian. If it is driven logic-low at power on reset the processor's memory system is
configured as little endian. The pin should not be changed after power on reset (POR) deasserts or during
operation.
13.4 Programming Model
The DMA module includes 107 user-accessible 32-bit registers. These registers are divided into three
groups by function:
•
General registers for all functional blocks (see Section 13.4.1, on page 13-8)
•
2D memory registers to control the display width and the x and y of the window (see
Section 13.4.2, on page 13-16)
•
Channel registers to control and configure channels 0–10 (see Section 13.4.3, on page 13-18)
Table 13-2 summarizes these registers and their addresses.
DMA_EOBI
This signal is asserted by the USB device when the last data of the burst is read from the
FIFO.
DMA_EOBI_CNT
This signal is asserted by the USB device when the last data of the burst is read from the
FIFO to indicate the number of valid bytes.
DMA_EOBO
This signal is asserted by the DMA controller when the last data of the burst is written to the
FIFO.
DMA_EOBO_CNT
This signal is asserted by the DMA controller when the last data of the burst is written to the
FIFO to indicate the number of valid bytes.
DMA_ERR
This signal is asserted by DMA controller when any DMA error is detected.
DMA_INT
This signal is asserted by DMA controller when data transfer is complete
—
that is, the data
count reaches the desired level.
Table 13-2. DMA Module Register Memory Map
Description
Name
Address
General Registers
DMA Control Register
DCR
0x00209000
DMA Interrupt Status Register
DISR
0x00209004
DMA Interrupt Mask Register
DIMR
0x00209008
DMA Burst Time-Out Status Register
DBTOSR
0x0020900C
Table 13-1. Signal Description (Continued)
Signal
Description
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