參數(shù)資料
型號: STPCI2HEYC
廠商: 意法半導體
英文描述: X86 Core PC Compatible System-on-Chip for Terminals
中文描述: x86內(nèi)核PC兼容系統(tǒng)上的終端芯片
文件頁數(shù): 79/111頁
文件大?。?/td> 1896K
代理商: STPCI2HEYC
DESIGN GUIDELINES
Issue 1.0 - July 24, 2002
79/111
6.3.3. SDRAM
The STPC provides all the signals for SDRAM
control. Up to 128 MBytes of main memory are
supported. All Banks must be 64 bits wide. Up to 4
memory banks are available when using 16Mbit
devices. Only up to 2 banks can be connected
when using 64Mbit and 128Mbit components due
to the reallocation of CS2# and CS3# signals. This
is described in
Table 6-4
and
Table 6-5
.
Graphics memory resides at the beginning of
Bank 0. Host memory begins at the top of graphics
memory and extends to the top of populated
SDRAM. Bank 0 must always be populated.
Figure 6-5
,
Figure 6-6
and
Figure 6-7
show some
typical implementations.
The purpose of the serial resistors is to reduce
signal oscillation and EMI by filtering line
reflections. The capacitance in
Figure 6-5
has a
filtering effect too, while it is used for propagation
delay compensation in the 2 other figures.
Figure 6-5. One Memory Bank with 4 Chips (16-bit)
CS0#
MA[12:0]
BA[1:0]
RAS0#
CAS0#
WE#
DQM[7:0]
MD[63:0]
MCLKI
MCLKO
DQM[7:6]
MD[63:48]
Reference Knot
DQM[5:4]
MD[47:32]
DQM[3:2]
MD[31:16]
DQM[1:0]
MD[15:0]
MCLKA
MCLKB
MCLKC
MCLKD
10pF
Length(MCLKI) = Length(MCLKy) with y = {A,B,C,D}
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