BMSKTOPASA900(DCE) Toshiba, BMSKTOPASA900(DCE) Datasheet - Page 762

• Manufacturer Part Number: BMSKTOPASA900(DCE)
• Description: KIT STARTER TMPA900 USB JTAG
• Manufacturer: Toshiba
• Series: TOPASr
• Type: MCUr

Specifications of BMSKTOPASA900(DCE)

• Contents: Evaluation Board, Cable(s), Software and Documentation
• For Use With/related Products: TMPA900CMXBG
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 3.22.5 Example of INTCMSF and DMA Request Generation When the Watermark Level Is 32 Bytes
Clear interrupt
Read 8 bytes
Read 24 bytes
Write 24 bytes
Write 8 bytes
Write 32 bytes
Empty
(3) Precautions for using DMA
When the RGB888 format (CMSCV<CRGBM>=1) is used and color space conversion is
not performed (CMSCV<CCVM1:0>=0y00), the FIFO cannot be read with DMA
requests. The CMSFPT register should be read by the CPU.
DMA requests are generated with the same conditions as those for the INTCMSF
interrupt.
INTCMSF requests are cleared by software whereas DMA requests cannot be cleared
by software. Each DMA request is cleared when 32 bytes or 48 bytes of data are read
from the FIFO. For details, see figure 3.22.5 below.
16 bytes 16 bytes 16 bytes 16 bytes 16 bytes
8 bytes are read.
32 bytes are written
24 bytes are read.
8 bytes are written.
24 bytes are written.
TENTATIVE
TMPA900CM- 761
Request
Cleared by S/W
INTCMSF
Request
DMA request
Cleared
Request
Request
*A write of 8 bytes brings the
total number of bytes in the
FIFO to 32 bytes. However, a
new interrupt request is not
generated because less than
32 bytes have been written.
*The DMA request is
cleared when 32 bytes
have been read.
*A new DMA request is
generated because 32
bytes have been written.
TMPA900CM
2009-10-14