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Epson Research and Development

 

Vancouver Design Center

 

 

The host interface control signals of the S1D13504 are asynchronous with respect to the S1D13504 bus clock. This gives the system designer full flexibility in choosing the appro- priate source (or sources) for CLKI and BUSCLK. Deciding whether both clocks should be the same and whether to use DCLKOUT (divided) as the clock source, should be based on the desired:

pixel and frame rates.

power budget.

part count.

maximum S1D13504 clock frequencies.

The S1D13504 also has internal clock dividers providing additional flexibility.

4.2 Memory Mapping and Aliasing

The S1D13504 requires an addressing space of 2M bytes for the display buffer and 64 bytes for the registers. This is divided into two address ranges by connecting A23 (demultiplexed from the PR31500/PR31700) to the M/R# input of the S1D13504. Using A23 makes this implementation software compatible with the two implementations that use the ITE IT8368E (see Section 5, “System Design Using the IT8368E PC Card Buffer” on page 14). All other addresses are ignored.

The S1D13504 address ranges, as seen by the PR31500/PR31700 on the PC Card slot 1 memory space, are as follows:

6400 0000h: S1D13504 registers aliased 131,072 times at 64 byte intervals over 8M bytes.

6480 0000h: S1D13504 display buffer aliased 4 times at 2M byte intervals over 8M bytes.

6500 0000h: S1D13504 registers and display buffer, aliased another 3 times over 48M bytes.

Since the PR31500/PR31700 control signal /CARDREG is ignored, the S1D13504 takes up the entire PC Card slot 1 configuration space. The address range is software compatible with both ITE IT8368E implementations.

0900 0000h: S1D13504 registers aliased 131,072 times at 64 byte intervals over 8M bytes.

0980 0000h: S1D13504 display buffer aliased 4 times at 2M byte intervals over 8M bytes.

Note

If aliasing is undesirable, additional decoding circuitry must be added.

S1D13504

Interfacing to the Philips MIPS PR31500/PR31700 Processor

X19A-G-005-08

Issue Date: 01/02/02

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Image 372
Epson S1D13504 manual Memory Mapping and Aliasing