參數(shù)資料
型號： mPD705101GM-100-8ED
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)： 15/72頁
文件大?。?/td> 302K
代理商： MPD705101GM-100-8ED
μ
PD705101
15
Figure 7-1. Output of Row Address and Column Address
(2) Decision of on-page/off-page
If the RAS signal is active when page access is enabled because the HPAE bit of the DRAM configuration register
(DRC) is 1, whether the DRAM access to be started is in the same page as the previous DRAM access is decided.
Table 7-1 shows the relation between an address to be compared and address shift.
Table 7-1. Address Compared by on-page/off-page Decision
Address Shift
Data Bus Width
16 bits
32 bits
8
a23-a9
a23-a10
9
a23-a10
a23-a11
10
a23-a11
a23-a12
(3) Refresh function
The BCU can automatically generate the distributed CBR refresh cycle necessary for refreshing the external
DRAM. Whether refreshing is enabled or disabled and the refresh interval are set by the refresh control register
(RFC).
The BCU has a refresh request queue that can store refresh requests up to seven times.
7.2 Page-ROM Control Function
The BCU controls page access to the Page-ROM. Page access to the Page-ROM is valid during burst access.
The page size (8 bytes/16 bytes) and the number of wait states (0 wait/1 wait) during page access can be set by using
the Page-ROM configuration register (PRC).
Address pins
A23
→
A15 A14 A13 A12 A11 A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
DAW = 10
a23
→
a15 a14
a23
a22
a21
a20
a19
a18
a17
a16
a15
a14
a13
a12
a11
DAW = 01
a23
→
a15 a23
a22
a21
a20
a19
a18
a17
a16
a15
a14
a13
a12
a11
a10
DAW = 00
a23
→
a15 a22
a21
a20
a19
a18
a17
a16
a15
a14
a13
a12
a11
a10
a9
Column address
a23
a1
相關(guān)PDF資料
PDF描述
mPD784037 16/8-BIT SINGLE-CHIP MICROCONTROLLER
mPD784031 16/8-BIT SINGLE-CHIP MICROCONTROLLER
mPD784035 16/8-BIT SINGLE-CHIP MICROCONTROLLER
mPD784036 16/8-BIT SINGLE-CHIP MICROCONTROLLER
mPD784038 16/8-BIT SINGLE-CHIP MICROCONTROLLER
相關(guān)代理商/技術(shù)參數(shù)
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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
MPD784037 制造商:NEC 制造商全稱:NEC 功能描述:16/8-BIT SINGLE-CHIP MICROCONTROLLER
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