參數(shù)資料
型號: TMX320VC5421
廠商: Texas Instruments, Inc.
元件分類: 數(shù)字信號處理
英文描述: DIGITAL SIGNAL PROCESSOR
中文描述: 數(shù)字信號處理器
文件頁數(shù): 34/88頁
文件大?。?/td> 1156K
代理商: TMX320VC5421
TMS320VC5421
DIGITAL SIGNAL PROCESSOR
SPRS098 – DECEMBER 1999
34
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
DMA accesses to external memory (continued)
DMA_ARB
CPU_ARB
EMIF
Controller
GRANT
DMA_REQ_B
DMA_GRANT_B
XDMA
(DSP
Subsystem B)
XIO
Grant
XIO
Req
Core
SEL=1
VCC
GPIO Control
Register
(DSP Subsystem B)
54x cLEAD CPU
(DSP Subsystem B)
(DSP Subsystem B)
Req
Grant
XIO
XIO
SEL=0
Core
54x cLEAD CPU
DMA_REQUEST
GRANT_A
GPIO Control
Register
(DSP Subsystem A)
Subsystem A)
(DSP
DMA_REQ_A
DMA_GRANT_A
DMA_REQUEST
GRANT_B
SEL
XIO
XHOLD
XHOLDA
XDMA
XCPU
XDMA
XCPU
Figure 15. Arbitration Between XIO and xDMA for External Access
The HM bit in the ST1 indicates whether the processor continues internal execution when acknowledging an
active HOLD signal.
HM = 0, the processor continues execution from internal program memory but places its external interface
in the high-impedance state.
When HM = 1, the processor halts internal execution.
To ensure that proper arbitration occurs, the HM bit should be set to 0 in the memory-mapped ST1 registers
for both CPUs.
To allow the DMA access to extended data pages, the SLAXS and DLAXs bits are added to the DMMCRn
register. For a description of the remaining bits, see TMS320C54x DSP Reference Set, Volume 5: Enhanced
Peripherals(literature number SPRU302).
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
AUTO
INIT
DINM
IMOD
CT
MOD
SLAXS
SIND
DMS
DLAXS
DIND
DMD
Figure 16. DMA Transfer Mode Control Register (DMMCRn)
A
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