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4.2 S1D13505 Configuration
S1D13505
Pin Name
MD0
MD[3:1]
111 = Toshiba TX3912 host bus interface if Alternate host bus interface is selected
MD4
Little Endian
MD5
WAIT# is active high (1 = insert wait state)
MD11
Alternate host bus interface selected
MD12
BUSCLK input divided by two: use with DCLKOUT
= configuration for Toshiba TX3912 host bus interface
S1D13505
X23A-G-010-04
The host interface control signals of the S1D13505 are asynchronous with respect to the
S1D13505 bus clock. This gives the system designer full flexibility to choose the
appropriate source (or sources) for CLKI and BUSCLK. The choice of whether both clocks
should be the same, whether to use DCLKOUT as clock source, and whether an external or
internal clock divider is needed, should be based on the desired:
• pixel and frame rates.
• power budget.
• part count.
• maximum S1D13506 clock frequencies.
The S1D13505 also has internal CLKI dividers providing additional flexibility.
The S1D13505 latches MD15 through MD0 to allow selection of the bus mode and other
configuration data on the rising edge of RESET#. For details on configuration, refer to the
S1D13505 Hardware Functional Specification, document number X23A-A-001-xx.
The table below shows those configuration settings relevant to the Toshiba TX3912 host
bus interface.
Table 4-1: S1D13505 Configuration for Direct Connection
Value on this pin at rising edge of RESET# is used to configure:
1 (V
)
DD
8-bit host bus interface
Epson Research and Development
0 (V
16-bit host bus interface
Big Endian
WAIT# is active low (0 = insert wait state)
Primary host bus interface selected
BUSCLK input not divided: use with external oscillator
Interfacing to the Toshiba MIPS TX3912 Processor
Vancouver Design Center
)
SS
Issue Date: 01/02/05
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