參數(shù)資料
型號(hào): XA-H4
廠商: NXP Semiconductors N.V.
英文描述: Single-chip 16-bit microcontroller
中文描述: 單片16位微控制器
文件頁數(shù): 38/42頁
文件大小: 225K
代理商: XA-H4
Philips Semiconductors
Preliminary specification
XA-H4
Single-chip 16-bit microcontroller
1999 Sep 24
38
t
CPWH
SU01287
t
CHSL
t
AVSL
t
CHAV
ClkOut
WE
D[7:0]
CASL
A
RAS (CS)
LS Byte
t
CHSH
MS Byte
t
CHAV
t
CHSL
t
CHAV
t
CHAV
t
CHSL
t
CHAH
t
CHAH
t
CHAH
t
CHSH
t
DVSL
t
DVSL
t
AVSL
CAS ADDRESS EVEN
CAS ADDRESS ODD
RAS ADDRESS
Figure 20. DRAM 16-Bit Write on 8-Bit Bus (FPM or EDO DRAMs)
SU01288
t
CHSL
ClkOut
CASH, CASL
RAS
t
CLRL
t
CHSH
RAS and CAS terminate together. The active low portion of RAS can be programmed to last from 3 to 6 clock cycles.
The high portion of RAS after Refresh can be programmed to last from 2 to 4 clock cycles. See Chapter 3 of the XA-H4 User Manual.
Figure 21. REFRESH
SU01289
RAS
NOTE:
t
RP
minimum is specified for each of the 5 individual RAS pins (CS_RAS[5:1])
It is the minimum high time (thus RAS inactive) between two DRAM bus cycles on the same RAS pin.
t
RP
Figure 22. RAS Precharge Time
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