STPCI2 STMicroelectronics, STPCI2 Datasheet - Page 79

• Manufacturer Part Number: STPCI2
• Description: STPC ATLAS DATASHEET - X86 CORE PC COMPATIBLE SYS
• Manufacturer: STMicroelectronics

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
Graphics memory resides at the beginning of
Bank 0. Host memory begins at the top of graphics
MCLKI
MCLKO
CS0#
MA[12:0]
BA[1:0]
RAS0#
CAS0#
WE#
DQM[7:0]
MD[63:0]
Table 6-4
Figure 6-5. One Memory Bank with 4 Chips (16-bit)
and
10pF
Reference Knot
Table
6-5.
Issue 1.0 - July 24, 2002
DQM[7:6]
MD[63:48]
MCLKD
Length(MCLKI) = Length(MCLKy) with y = {A,B,C,D}
memory and extends to the top of populated
SDRAM. Bank 0 must always be populated.
Figure
typical implementations.
The purpose of the serial resistors is to reduce
signal oscillation and EMI by filtering line
reflections. The capacitance in
filtering effect too, while it is used for propagation
delay compensation in the 2 other figures.
6-5,
DQM[5:4]
MD[47:32]
MCLKC
Figure 6-6
DQM[3:2]
MD[31:16]
MCLKB
and
DESIGN GUIDELINES
Figure 6-7
Figure 6-5
MCLKA
DQM[1:0]
MD[15:0]
show some
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has a