Section 14 Direct Memory Access Controller (DMAC)
Rev. 1.00 Oct. 01, 2007 Page 608 of 1956
REJ09B0256-0100
14.4.5 Repeat
Mode
Transfer
In a repeat mode transfer, a DMA transfer is repeated without specifying the transfer settings
every time before executing a transfer.
Using a repeat mode transfer with the half end function allows a double buffer transfer executed
virtually. Following processing can be executed effectively by using a repeat mode transfer. As an
example, operation of receiving voice data from the VOICE CODEC and compressing it is
explained.
In the following example, processing of compressing 40-word voice data every data reception is
explained. In this case, it is assumed that voice data is received by means of SIOF.
1. DMAC settings
•
Set address of the SIOF receive data register in SAR
•
Set address of an internal memory data store area in DAR
•
Set TCR to H'50 (80 times)
•
Satisfy the following settings of CHCR
Bits RPT[2:0] = B'010: Repeat mode (use DAR as a repeat area)
Bit HIE = B'1: TCR/2 interrupt generated
Bits DM[1:0] = B'01: DAR incremented
Bits SM[1:0] = B'00: SAR fixed
Bit IE = B'1: Interrupt enabled
Bit DE = B'1: DMA transfer enabled
•
Set such as bits TB and TS[2:0] according to use conditions
•
Set bits CMS[1:0] and PR[1:0] in DMAOR according to use conditions and set the DME bit to
B'1
2. Voice data is received and then transferred by SIOF/DMAC
3. TCR is decreased to half of its initial value and an interrupt is generated
After reading CHCR to confirm that the HE bit is set to 1 by an interrupt processing, clear the HE
bit to 0 and compress 40-word voice data from the address set in DAR.
4. TCR is cleared to 0 and an interrupt is generated
After reading CHCR to confirm that the TE bit is set to 1 by an interrupt processing, clear the
TE bit to 0 and compress 40-word voice data from the address set in DAR + 40. After this
operation, the value of DARB is copied to DAR in DMAC and initialized, and the value of
TCRB is copied to TCR and initialized to 80.
Содержание SH7763
Страница 2: ...Rev 1 00 Oct 01 2007 Page ii of lxvi ...
Страница 122: ...Section 2 Programming Model Rev 1 00 Oct 01 2007 Page 56 of 1956 REJ09B0256 0100 ...
Страница 144: ...Section 3 Instruction Set Rev 1 00 Oct 01 2007 Page 78 of 1956 REJ09B0256 0100 ...
Страница 170: ...Section 4 Pipelining Rev 1 00 Oct 01 2007 Page 104 of 1956 REJ09B0256 0100 ...
Страница 282: ...Section 7 Caches Rev 1 00 Oct 01 2007 Page 216 of 1956 REJ09B0256 0100 ...
Страница 378: ...Section 9 Interrupt Controller INTC Rev 1 00 Oct 01 2007 Page 312 of 1956 REJ09B0256 0100 ...
Страница 514: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Oct 01 2007 Page 448 of 1956 REJ09B0256 0100 ...
Страница 630: ...Section 13 PCI Controller PCIC Rev 1 00 Oct 01 2007 Page 564 of 1956 REJ09B0256 0100 ...
Страница 686: ...Section 14 Direct Memory Access Controller DMAC Rev 1 00 Oct 01 2007 Page 620 of 1956 REJ09B0256 0100 ...
Страница 710: ...Section 16 Clock Pulse Generator CPG Rev 1 00 Oct 01 2007 Page 644 of 1956 REJ09B0256 0100 ...
Страница 732: ...Section 17 Watchdog Timer and Reset WDT Rev 1 00 Oct 01 2007 Page 666 of 1956 REJ09B0256 0100 ...
Страница 752: ...Section 18 Power Down Mode Rev 1 00 Oct 01 2007 Page 686 of 1956 REJ09B0256 0100 ...
Страница 772: ...Section 19 Timer Unit TMU Rev 1 00 Oct 01 2007 Page 706 of 1956 REJ09B0256 0100 ...
Страница 824: ...Section 21 Compare Match Timer CMT Rev 1 00 Oct 01 2007 Page 758 of 1956 REJ09B0256 0100 ...
Страница 1060: ...Section 23 Gigabit Ethernet Controller GETHER Rev 1 00 Oct 01 2007 Page 994 of 1956 REJ09B0256 0100 ...
Страница 1062: ...Section 24 IP Security Accelerator SECURITY Rev 1 00 Oct 01 2007 Page 996 of 1956 REJ09B0256 0100 ...
Страница 1124: ...Section 26 I 2 C Bus Interface IIC Rev 1 00 Oct 01 2007 Page 1058 of 1956 REJ09B0256 0100 ...
Страница 1184: ...Section 27 Serial Communication Interface with FIFO SCIF Rev 1 00 Oct 01 2007 Page 1118 of 1956 REJ09B0256 0100 ...
Страница 1350: ...Section 30 SIM Card Module SIM Rev 1 00 Oct 01 2007 Page 1284 of 1956 REJ09B0256 0100 ...
Страница 1484: ...Section 33 Audio Codec Interface HAC Rev 1 00 Oct 01 2007 Page 1418 of 1956 REJ09B0256 0100 ...
Страница 1560: ...Section 35 USB Host Controller USBH Rev 1 00 Oct 01 2007 Page 1494 of 1956 REJ09B0256 0100 ...
Страница 1720: ...Section 37 LCD Controller LCDC Rev 1 00 Oct 01 2007 Page 1654 of 1956 REJ09B0256 0100 ...
Страница 2025: ......
Страница 2026: ...SH7763 Hardware Manual ...