參數(shù)資料
型號: UPD70741
廠商: NEC Corp.
元件分類: 16位微控制器
英文描述: V821TM 32-/16-BIT MICROPROCESSOR
中文描述: V821TM 32-/16-BIT微處理器
文件頁數(shù): 30/112頁
文件大小: 605K
代理商: UPD70741
μ
PD70741
30
5. WAIT CONTROL FUNCTIONS
The wait control unit (WCU) manages the four blocks corresponding to the four chip select signals, generates the
chip select signals, performs wait control, and selects the bus cycle types.
5.1 Features
Able to control up to four blocks in the memory and I/O spaces
Linear address space of each block: 16 Mbytes
Wait control
Automatic insertion of 0-7 waits per block
Insertion of waits using the READY pin
Bus cycle selection function
Page-ROM cycle selectable (address block 3)
DRAM cycle selectable (address block 0)
Figure 5-1. Memory and I/O Maps
FFFFFFFFH
00000000H
40000000H
3FFFFFFFH
80000000H
7FFFFFFFH
C0000000H
BFFFFFFFH
FFFFFFFFH
00000000H
40000000H
3FFFFFFFH
80000000H
7FFFFFFFH
C0000000H
BFFFFFFFH
Block 3
(1 Gbyte)
Block 2
(1 Gbyte)
Block 1
(1 Gbyte)
Block 0
(1 Gbyte)
16 Mbytes
16 Mbytes
Image
Image
Image
Image
Image
Image
Block 3
(1 Gbyte)
Internal I/O
Block 2
(1 Gbyte)
Block 1
(1 Gbyte)
Block 0
(1 Gbyte)
16 Mbytes
Image
Image
Image
(1) Memory map
(2) I/O map
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