S1D13742 Epson, S1D13742 Datasheet - Page 98

• Manufacturer Part Number: S1D13742
• Description: Mobile Graphics Engine
• Manufacturer: Epson

Page 98
17 Host Interface
17.1 Using the Intel 80 Interface
17.1.1 Register write procedure
S1D13742
X63A-A-001-06
Note
Accessing the S1D13742 through the Intel 80 interface is a multiple step process. All
Registers and Memory are accessed through register space.
First, perform a single “Address Write” to setup the register address. Next a “Data
Read/Write” is performed that specifies the data to be stored or read from the registers or
memory specified in the “Address Write” cycle. Subsequent data Read/Writes without a
Address Write to change the register address, will automatically “auto” increment the
register address or the internal memory address if accessing the Memory Data Port.
To write display data to a Window Aperture, simply set-up the Window coordinates
followed by the burst data writes to the Memory Data Port to fill the window. In this
sequence, the internal memory addressing is automatic (see examples). The Memory Data
Port is located directly following the Window coordinates to minimize the number of
Address Writes.
To Read display data, perform an Address Write to the Memory Address Port (3 bytes) and
then read data from the Memory Data Port. Sequential reads will auto-increment the
internal memory address
1. Perform address write to setup register address bits 7-0.
2. Perform data write to update the register.
3. Additional data writes are supported. In this case, the register addresses will be auto-
All Register accesses, except the Memory Data Port, are 8-bit only. If the Host in-
terface is 16-bits wide, the lsb’s (MD[7:0]) are used for all registers except the
Memory Data Port.
The Memory Data Port (REG[48h, 49h]) is handled as 8-bit if CNF1 = 0
(REG[49h] not used) or 16-bit if CNF1 =1.
incremented.
Revision 6.01 - EPSON CONFIDENTIAL
www.DataSheet.co.kr
Epson Research and Development
Hardware Functional Specification
Vancouver Design Center
Issue Date: 2007/09/18
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