參數(shù)資料
型號: VCT3801A
廠商: MICRONAS SEMICONDUCTOR HOLDING AG
英文描述: Video/Controller/Teletext IC Family
中文描述: 視頻/控制/圖文電視IC系列
文件頁數(shù): 97/172頁
文件大小: 2243K
代理商: VCT3801A
ADVANCE INFORMATION
VCT 38xxA
Micronas
97
Fig. 5–7:
Block diagram of DMA interface
In general, all TPU addresses are mapped into bank
16 to 31 of the CPU address space by forcing the MSB
of the address bus to “1” (see Fig. 5–8). Additionally
4 memory segments can be mapped into any address
area by programming a set of DMA registers (see
Fig. 5–9).
Special care should be taken when mapping TPU
addresses into the RAM area of bank 0. Any over-
lap between TPU memory (e.g. OSD Bank) and
controller memory (e.g. non zero page variables)
must be avoided.
Fig. 5–8:
DMA address mapping
DMA Interface
TPU
SRAM
Interface
CPU
A[18:0]
D[7:0]
RWQ
PH2
RWQ
RDY
BE
ADB[19:0]
DB[7:0]
RWQ
Address
Mapping
Mux 1:5
Decoder
ADB[19:8]
A19 = “1”
3
12
match4
match3
match2
match1
12
12
12
12
12
map
1
map
2
map
3
map
4
A[18:8]
TPU Address Bus
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