參數(shù)資料
型號: UPD61052
廠商: NEC Corp.
英文描述: MOS INTEGRATED CIRCUIT MPEG2 AUDIO/VIDEO ENCODER
中文描述: 馬鞍山集成電路MPEG2音頻/視頻編碼器
文件頁數(shù): 32/106頁
文件大小: 824K
代理商: UPD61052
Data Sheet S15082EJ4V0DS
32
μ
PD61051, 61052
2.5
Host CPU Interface
The connection of the host CPU can select the eight bits parallel data interface and serial interface (SPI). Internal
CPU sends and receives command status through the System Interface Register, which is in the host CPU interface
unit. In addition, to control an internal DMA controller through the system interface register, it loads an instruction for
internal CPU to the instruction RAM and the transfer of the large-volume data can be sent to the data area on SDRAM.
Figure 2-12. Host CPU Interface
Host
CPU
System
Interface
Register
Instruction
RAM of
Internal CPU
Internal
CPU
SDRAM
Interface
SDRAM
DMA
Controller
μPD61051/61052
The following describes loading of internal CPU instruction.
(1)
Parallel interface
When parallel interface is selected, host interface has 6-bit address, 8-bit data bus and control ports.
CWAIT is selected with CMODE1 to wait on ready signal mode, CMODE1 selects active polarity of CWAIT.
(2)
Serial interface
The
μ
PD61051/61052 communicates with the host CPU using the SPI (serial peripheral interface) serial bus. The
host CPU becomes a bus master.
The low edge of the chip selection is communication beginning. Its high edge is communication ending.
An address and the reading / writing mode are shown at the first byte after the chip selection becomes low.
It is the MSB first of six bits of addresses, eight bits of data. Fix CSCLK to high level during CCS is disabled (high
level).
The
μ
PD61051/61052 becomes a master and downloads the instruction of the internal CPU from external ROM.
CSCLK:
The serial clock
CSDI:
The data input
CSDO:
The data output
CCS:
The chip selection
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