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參數(shù)資料
| 型號： | UPD70208HGK-20-9EU |
| 廠商： | NEC Corp. |
| 英文描述： | V40HLTM, V50HLTM 16/8, 16-BIT MICROPROCESSOR |
| 中文描述： | V40HLTM，V50HLTM 16 / 8，16位微處理器 |
| 文件頁數(shù)： | 29/110頁 |
| 文件大?。?/td> | 625K |
| 代理商： | UPD70208HGK-20-9EU |
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29
μ
PD70208H, 70216H
Data Sheet U13225EJ4V0DS00
8.
REFU (REFRESH CONTROL UNIT)
The REFU generates refresh cycles required for refreshing of external DRAM. Refresh enabling/disabling and the refresh
interval can be set programmably.
8.1
FEATURES
Lowest-priority refreshing/highest-priority refreshing
7-refresh queue
16-bit refresh address
REFRQ extended timing supported (REFRQ active from T1 state)
8.2
REFRESH OPERATIONS
The REFU has two priorities. Normally, it has the lowest priority, and a refresh cycle cannot be started unless the bus
is completely idle. However, if there are 7 or more pending refresh requests, it is given the highest priority, and it requests
the bus master holding the bus to relinquish it. (See
6. BAU
.)
The refresh address is output on A0 to A15. Every refresh cycle the refresh address is incremented by 1 (for the V40HL)
or by 2 (for the V50HL), and the next refresh address is generated.
In a refresh cycle, a low-level signal is output on the low address pins (A16 to A19).
This refresh address is not affected by a reset. When the device is powered on, the refresh address is undefined.
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| UPD70236AGC-10-9EV | LJT 19C 19#12 SKT PLUG |
| UPD70236AGC-12-9EV | Circular Connector; No. of Contacts:19; Series:MS27467; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:25; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:25-19 RoHS Compliant: No |
| UPD70236AGC-16-9EV | Circular Connector; No. of Contacts:19; Series:MS27467; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:25; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:25-19 RoHS Compliant: No |
| UPD70236AGC-20-9EV | Circular Connector; No. of Contacts:19; Series:MS27467; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:25; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:25-19 RoHS Compliant: No |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UPD70208HLP-10 | 制造商:NEC 制造商全稱:NEC 功能描述:V40HLTM, V50HLTM 16/8, 16-BIT MICROPROCESSOR |
| UPD70208HLP-12 | 制造商:NEC 制造商全稱:NEC 功能描述:V40HLTM, V50HLTM 16/8, 16-BIT MICROPROCESSOR |
| UPD70208HLP16 | 制造商: 功能描述: 制造商:undefined 功能描述: |
| UPD70208HLP-16 | 制造商:NEC 制造商全稱:NEC 功能描述:V40HLTM, V50HLTM 16/8, 16-BIT MICROPROCESSOR |
| UPD70208HLP-20 | 制造商:NEC 制造商全稱:NEC 功能描述:V40HLTM, V50HLTM 16/8, 16-BIT MICROPROCESSOR |
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