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Interfacing to the Philips MIPS PR31500/PR31700 Processor S1D13504
Issue Date: 01/02/02 X19A-G-005-08
5.2 Hardware DescriptionUsing Two IT8368Es

The following implementation uses a second IT8368E, not in VGA mode, in place of an

address latch. The pins LHA23 and LHA[20:13] provide the latch function instead.

Figure 5-2: S1D13504 to PR31500/PR31700 Connection using Two IT8368E

IT8368E
S1D13504
A[12:0] AB[12:0]
D[31:24] DB[7:0]
LHA23/MFIO10 WE1#
WE0#
RD1#
RD0#
CS#
LHA22/MFIO9
LHA21/MFIO8
LHA20/MFIO7
LHA19/MFIO6
WAIT#
/CARDxWAIT
M/R#
RESET#
AB[20:13]
LHA23

PR31500/PR31700

D[23:16] DB[15:8]
DCLKOUT
Notes: The Chip Select Logic shown above is necessary to guarantee the timing parameter t1
of the Generic MPU Host Bus Interface Asynchronous Timing (for details refer to the
S1D13504 Hardware
Functional Specification
, document number X19A-A-002-xx).
IT8368E
Chip Select
Logic
LHA[20:13],
System RESET
ENDIAN
BUSCLK
Oscillator
...or...
pull-up
VDD
IO VDD, CORE VDD
+3.3V
Clock divider
CLKI
See text
LHA23
When connecting the S1D13504 RESET# pin, the system designer should be aware of all conditions that may reset
the S1D13504 (e.g. CPU reset can be asserted during wake-up from power-down modes, or during debug states).