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)： 31/42頁
文件大?。?/td> 225K
代理商： XA-H4
Philips Semiconductors
Preliminary specification
XA-H4
Single-chip 16-bit microcontroller
1999 Sep 24
31
8. t
RP
is specified as the minimum high time (thus inactive) on each of the 5 individual CS_RAS[5:1] pins when such pin is programmed in the
memory controller to service DRAM. The number of CClks (system clocks) in t
RP
is programmable, and is represented by n in the t
RP
equation in the AC tables. Regardless of what value is programmed into the control register, n will never be less than 2 clocks. Thus, at
30 Mhz system clock, the minimum value for RAS precharge is tRP=((2 * t
) – 16= ((2 * 33.33) – 16) = 50.6 ns. As the system clock
frequency F
, is slowed down, t
(system clock period) of course becomes greater, and thus t
becomes greater.
9. The MIN value for this parameter is guaranteed by design and is not tested in production to the specified limit. In those cases where a
maximum value is specified in the table for this parameter, it is tested.
TIMING DIAGRAMS
All references to numbered Notes are to the notes following the AC Electrical Characteristics tables
SU01277
ClkOut
A19–A1
CS
BHE/BLE
OE
D15–D0
t
CHAV
t
CHSL
t
AVSL
Note 3
t
DIS
t
DIH
(Note 2)
t
CHSH
A0
t
CHAH
t
AHDR
(Does Not Include A0)
Note:
On Generic Data Reads, A0 can terminate a full clock period before A19–A1, and therefore
should not be used on some peripheral devices.
Figure 7. Generic (SRAM, ROM, Flash, I/O Devices, etc.) Read on 16-Bit Bus
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