參數(shù)資料
型號(hào): MB91F155PFV-G
廠商: FUJITSU LTD
元件分類: 微控制器/微處理器
英文描述: 32-bit Proprietary Microcontrollers
中文描述: 32-BIT, FLASH, 33 MHz, RISC MICROCONTROLLER, PQFP144
封裝: PLASTIC, LQFP-144
文件頁(yè)數(shù): 65/104頁(yè)
文件大小: 918K
代理商: MB91F155PFV-G
MB91F155/MB91154
65
12. External Bus Interface
The external bus interface controls the interface between the external memory and the external I/O. Its features
are as follows :
24-bit (16 MB) address output
An 8/16-bit bus width can be set by chip select area.
Inserts an automatic and programmable memory wait (for seven cycles at maximum) .
Unused addresses/data pins are available as I/O ports.
Support for little endian mode
Use of a clock doubler, 33 MHz internal and 16.5 MHz external bus operations
Block Diagram
Write
buffer
Read
buffer
Address
buffer
Switch
Switch
A-Out
M
U
X
External DATA Bus
ASR
AMR
Registers
&
Control
External pin controller
3
4
4
Shifter
Comparator
Controls all blocks.
Inpage
+
1 or
+
2
DATA BLOCK
ADDRESS BLOCK
External
Address Bus
CS0 to CS3
RD
WR0, WR1
BRQ
BGRNT
RDY
CLK
A
D
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