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STPC4EDBI Datasheet(PDF) 16 Page - STMicroelectronics

Description  X86 Core PC Compatible Information Appliance System-on-Chip
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPC4EDBI Datasheet(HTML) 16 Page - STMicroelectronics

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Release 1.5 - January 29, 2002
SYSRSTI# System Reset/Power good. This input
is low when the reset switch is depressed.
Otherwise, it reflects the power supply power
good signal. This input is asynchronous to all
clocks, and acts as a negative active reset. The
reset circuit initiates a hard reset on the rising
edge of this signal.
Reset Output to System. This is the
system reset signal and is used to reset the rest of
the components (not on Host bus) in the system.
The ISA bus reset is an externally inverted
buffered version of this output and the PCI bus
reset is an externally buffered version of this
14.3 MHz Crystal Input
XTALO 14.3 MHz Crystal Output. These pins are
provided for the connection of an external 14.318
MHz crystal to provide the reference clock for the
internal frequency synthesizer, from which all
other clock signals are generated.
The 14.318 MHz series-cut fundamental (not
overtone) mode quartz crystal must have an
Equivalent Series Resistance (ESR, sometimes
referred to as Rm) of less then 50 Ohms (typically
8 Ohms) and a shunt capacitance (Co) of less
than 7 pF. Balance capacitors of 16 pF should
also be added, one connected to each pin.
In the event of an external oscillator providing the
master clock signal to the STPC Consumer-II
device, the LVTTL signal should be connected to
Host Clock. This clock supplies the CPU
and the host related blocks. This clock can be
doubled inside the CPU and is intended to operate
in the range of 25 MHz to 100 MHz. This clock is
generated internally from a PLL but can be driven
directly from the external system.
24 MHz Peripheral Clock. This 24 MHz
signal is provided as a convenience for the system
integration of a Floppy Disk driver function in an
external chip.
135 MHz Dot Clock. This is the dot clock,
which drives graphics display cycles. Its frequency
can go from 8 MHz (using internal PLL) up to 135
MHz, and it is required to have a worst case duty
cycle of 60-40.
This signal is driven either by the internal pll (VGA)
or by an external 27 MHz oscillator (when the
composite video output is enabled). The direction
can be controlled by a strap option or an internal
register bit.
MCLKO Memory Clock Output. This clock is
driving the DIMMs on board and is generated from
an internal PLL. The default value is 66 MHz.
MCLKI Memory Clock Input. This clock is driving
the SDRAM controller, the graphics engine and
display controller. This input should be a buffered
version of the MCLKO signal with the track lengths
between the buffer and the pin matched with the
track lengths between the buffer and the DIMMs.
Chip Select These signals are used to
disable or enable device operation by masking or
enabling all SDRAM inputs except MCLK, CKE,
and DQM.
CS#[2]/MA[11] Chip Select/Bank Address This
pin is CS#[2] in the case when 16-Mbit devices are
used. For all other densities, it becomes MA[11].
Address/Bank Address This pin is CS#[3] in the
case when 16-Mbit devices are used. For all other
densities, it becomes MA[12] when two internal
banks devices are used and BA[1] when four
internal bank devices are used.
Memory Address. Multiplexed row and
column address lines.
BA[0] Memory Bank Address.
MD[63:0] Memory Data. This is the 64-bit memory
data bus. MD[40-0] are read by the device strap
option registers during rising edge of SYSRSTI#.
RAS#[1:0] Row Address Strobe. There are two
active-low row address strobe output signals. The
RAS# signals drive the memory devices directly
without any external buffering.
CAS#[1:0] Column Address Strobe. There are
two active-low column address strobe output
signals. The CAS# signals drive the memory
devices directly without any external buffering.
MWE# Write Enable. Write enable specifies
whether the memory access is a read (MWE# = H)
or a write (MWE# = L).
DQM#[7:0] Data Mask. Makes data output Hi-Z
after the clock and masks the SDRAM outputs.
Blocks SDRAM data input when DQM active.
PCI_CLKI 33 MHz PCI Input Clock. This signal is
the PCI bus clock input and should be driven from
the PCI_CLKO pin.

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