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參數(shù)資料
| 型號： | mPD705101 |
| 廠商： | NEC Corp. |
| 英文描述： | V831TM 32-BIT MICROPROCESSOR |
| 中文描述： | V831TM 32位微處理器 |
| 文件頁數(shù)： | 14/72頁 |
| 文件大小： | 302K |
| 代理商： | MPD705101 |
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μ
PD705101
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7. MEMORY ACCESS CONTROL FUNCTION
The features of the memory access control function are as follows:
DRAM control function
Generates RAS, LLCAS, LUCAS, ULCAS, UUCAS, REFRQ, OE, and WE signals
Address multiplex: 8, 9, or 10 bits
Timing control of DRAM access
CAS access period
: 1 or 2 bus clocks selectable
RAS-CAS delay period : 1.5 or 2.5 bus clocks selectable
RAS precharge period : 2 or 3 bus clocks selectable
CBR refresh and CBR self-refresh functions
Page-ROM control function
Page size
: 8 or 16 bytes
Wait control during page access: 0 or 1 wait states
7.1 DRAM Control Function
The BCU generates RAS, LLCAS, LUCAS, ULCAS, UUCAS, REFRQ, OE, and WE signals and controls access
to the DRAM. Addresses are output to the DRAM from the address pins by multiplexing row and column addresses.
The connected DRAM must be of x8 bits or more and have a hyper page mode (EDO).
The refresh mode is a CAS-before-RAS (CBR) mode, and the refresh cycle can be arbitrarily set.
CBR self refresh is performed in the STOP mode.
(1) Address multiplex function
An address is multiplexed as shown in Figure 7-1 when a row and column addresses are output in the DMA cycle,
depending on the value of the DAW bit of the DRAM configuration register (DRC). In this figure, a1 through a23
indicate the address output by the CPU, and A1 through A23 indicate the address pins of the V831.
相關(guān)PDF資料 |
PDF描述 |
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| mPD705101GM-100-8ED | V831TM 32-BIT MICROPROCESSOR |
| mPD784037 | 16/8-BIT SINGLE-CHIP MICROCONTROLLER |
| mPD784031 | 16/8-BIT SINGLE-CHIP MICROCONTROLLER |
| mPD784035 | 16/8-BIT SINGLE-CHIP MICROCONTROLLER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MPD705101GM-100-8ED | 制造商:NEC 制造商全稱:NEC 功能描述:V831TM 32-BIT MICROPROCESSOR |
| MP-D70P-100/240V | 制造商:Panasonic Electric Works 功能描述: |
| MPD784031 | 制造商:NEC 制造商全稱:NEC 功能描述:16/8-BIT SINGLE-CHIP MICROCONTROLLER |
| MPD784035 | 制造商:NEC 制造商全稱:NEC 功能描述:16/8-BIT SINGLE-CHIP MICROCONTROLLER |
| MPD784036 | 制造商:NEC 制造商全稱:NEC 功能描述:16/8-BIT SINGLE-CHIP MICROCONTROLLER |
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