參數(shù)資料
型號: 37C672
廠商: SMSC Corporation
英文描述: ENHANCED SUPER I/O CONTROLLER WITH FAST IR
中文描述: 增強的超級I / O控制器,快速紅外線
文件頁數(shù): 27/173頁
文件大?。?/td> 965K
代理商: 37C672
APPLICATION
2.6 Processor mode
2-65
3802 GROUP USER’S MANUAL
2.6.3 Processor mode application examples
____
(1) Application example of memory expansion in the case where the ONW (One-Wait)
function is not used
Outline : The external memory is accessed in the microprocessor mode.
At f(XIN) = 8 MHz, an available RAM is given by the following :
___
OE access time : ta (OE)
≤ 50 ns
Setup time for writing data : tsu (D)
≤ 65 ns
For example, the M5M5256BP-10 whose address access is 100 ns is available.
Figure 2.6.3 shows an expansion example of a 32K byte ROM and a 32K byte RAM.
Fig. 2.6.3 Expansion example of ROM and RAM
3802 group
CNVSS
ONW
AD15
8P4
8P5
8P6
AD14
AD0
DB0
DB7
RD
WR
M5M27C256AK-10
M5M5256BP-10
CE
A0–A14
D0–D7
OE
A0–A14
DQ1–DQ8
OE
W
8MHz
VCC = 5.0V
± 10 %
000016
800016
044016
004016
000816
FFFF16
External RAM area
(M5M5256BP)
SFR area
Internal RAM area
External RAM area
(M5M5256BP )
External ROM area
(M5M27C256AK )
Memory map
74F04
S
15
8
2P30, P31
EPROM
SRAM
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