參數(shù)資料
型號: MB91340PMT
元件分類: 微控制器/微處理器
英文描述: 32-BIT, MROM, 66 MHz, RISC MICROCONTROLLER, PQFP176
封裝: PLASTIC, LQFP-176
文件頁數(shù): 70/126頁
文件大?。?/td> 1501K
代理商: MB91340PMT
MB91340/MB91V340
48
Chip select areas
The external bus interface supports up to eight separate chip select area settings.
The address range for each area can be set anywhere in the 4Gbyte memory space in 64Kbyte increments.
The address settings for each area are set in ASR0 to ASR7 (Area Select Register) and ACR0 to ACR7 (Area
Configuration Register).
When bus access is performed to one of the areas specified in these registers, the corresponding chip select
signal (CS0 to CS7) is asserted (outputs "L") for the duration of the access cycle.
After a reset and until a value is written to ACR0, address range 00000000H to FFFFFFFFH is assigned to chip
select area 0.
Block Diagram
MUX
CS0
CS7
RD
WR0, WR1
WR2, WR3
AS, BAA
BRQ
BGRNT
RDY
32
write buffer
read buffer
switch
+1 or +2
address buffer
ASR
ASZ
comparator
DATA BLOCK
ADDRESS BLOCK
resisters
&
control
External pin controller
All block control
Internal
address bus
Internal
data bus
External data bus
External address
bus
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