S1D13305F00A100 Datasheet, PDF (240/266 Pages) Epson Company – Embedded 80K byte SRAM display buffer.

6: INTERFACING TO THE PHILIPS MIPS PR31500/PR31700 PROCESSOR
6.4 Direct Connection to the Philips PR31500/PR31700
General Description
In this example implementation the S1D13705 occupies the PR31500/PR31700 PC Card slot #1.
The S1D13705 is easily interfaced to the PR31500/PR31700 with minimal additional logic. The
address bus of the PR31500/PR31700 PC Card interface is multiplexed and must be demultiplexed
using an advanced CMOS latch (e.g., 74AHC373). The direct connection approach makes use of the
S1D13705 in its “Generic #2” interface configuration.
The following diagram demonstrates a typical implementation of the interface.
PR31500/PR31700
/CARDIOREAD
/CARDIOWR
+3.3V
S1D13705
IO V_DD, CORE V_DD
RD#
WE0#
/CARD1CSL
/CARD1CSH
ENDIAN
ALE
Latch
+3.3V
+3.3V
System RESET
WE1#
BS#
RD/WR#
RESET#
CS#
A[12:0]
D[31:24]
D[23:16]
/CARD1WAIT
DCLKOUT
V_{DD pull-up}
Clock divider
AB[16:13]
AB[12:0]
DB[7:0]
DB[15:8]
...or...
Oscillator
See text
WAIT#
CLKI
BCLK
Note:
When connecting the S1D13705 RESET# pin, the system designer should be aware of all
conditions that may reset the S1D13705 (e.g. CPU reset can be asserted during wake-up
from power-down modes, or during debug states).
Figure 6-1 S1D13705 to PR31500/PR31700 Direct Connection
Note: See Section , “Host Bus Pin Connection” on page 5-29 and Section , “Generic #2 Interface
Mode” on page 5-26 for Generic #2 pin descriptions.
The “Generic #2” host interface control signals of the S1D13705 are asynchronous with respect to
the S1D13705 bus clock. This gives the system designer full flexibility to choose the appropriate
source (or sources) for CLKI and BCLK. The choice of whether both clocks should be the same, and
whether to use DCLKOUT (divided) as clock source, should be based on the desired:
• pixel and frame rates.
• power budget.
• part count.
• maximum S1D13705 clock frequencies.
The S1D13705 also has internal clock dividers providing additional flexibility.
S1D13705F00A APPLICATION NOTES
(X27A-G-012-01)
EPSON
5-39