參數(shù)資料
型號: PSD413A1
英文描述: Field Programmable Microcontroller Peripherals(可編程邏輯,16K位SRAM,40個可編程I/O,通用PLD有37個輸入)
中文描述: 現(xiàn)場可編程微控制器外圍設(shè)備(可編程邏輯,16K的位的SRAM,40余個可編程輸入/輸出,通用PLD的有37個輸入)
文件頁數(shù): 37/97頁
文件大小: 309K
代理商: PSD413A1
PSD4XX Famly
4-37
PSD4XX Interface To Non-Multiplexed Bus
Figure 21 shows a PSD4XX interfacing to a microcontroller with a non-multiplexed
address/data bus. The address bus is connected to the ADIO Port, and the data bus is
connected to Port C and/or Port D, depending on the bus width. There is no need for the
ADIO Port to latch the address internally, but the user is offered the option to do so in the
PSD4XX PSDsoft Software. The data Ports are in tri-state mode when the PSD4XX is not
accessed by the microcontroller.
Data Byte Enable
Microcontrollers have different data byte orientations with regard to the data bus. The
following tables show how the PSD4XX handles the byte enable under different bus
configurations. Even byte refers to locations with address A0 equal to “0”, and odd byte as
locations with A0 equal to “1”.
BHE
A0
D7 – D0
X
0
Even Byte
X
1
Odd Byte
Table 7. 8-Bit Data Bus
Table 8. 16-Bit Data Bus With BHE
BHE
A0
D15 – D8
D7 – D0
0
0
Odd byte
Even byte
0
1
Odd byte
1
0
Even byte
WRH
0
WRL
0
D15 – D8
Odd byte
D7 – D0
Even byte
0
1
Odd byte
1
0
Even byte
Table 9. 16-Bit Data Bus With WRHand WRL
SIZ0
A0
D15 – D8
D7 – D0
0
0
Even byte
Odd byte
1
0
Even byte
1
1
Odd byte
Table 10. 16-Bit Data Bus With SIZ0, A0
LDS
UDS
D15 – D8
D7 – D0
0
0
Even byte
Odd byte
1
0
Even byte
0
1
Odd byte
Table 11. 16-Bit Data Bus With UDS, LDS
Bus
Interface
(Cont.)
相關(guān)PDF資料
PDF描述
PSD401A1 Field Programmable Microcontroller Peripherals(可編程邏輯,16K位SRAM,40個可編程I/O,通用PLD有37個輸入)
PSD401A2 Field Programmable Microcontroller Peripherals(可編程邏輯,16K位SRAM,40個可編程I/O,通用PLD有59個輸入)
PSD402A1 Field Programmable Microcontroller Peripherals(可編程邏輯,16K位SRAM,40個可編程I/O,通用PLD有37個輸入)
PSD402A2 Field Programmable Microcontroller Peripherals(可編程邏輯,16K位SRAM,40個可編程I/O,通用PLD有59個輸入)
PSD403A1 Field Programmable Microcontroller Peripherals(可編程邏輯,16K位SRAM,40個可編程I/O,通用PLD有37個輸入)
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