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Epson Research and Development Page 121
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Hardware Functional Specification S1D13708
Issue Date: 02/03/07 X39A-A-001-02
8.3 Register Descriptions
Unless specified otherwise, all register bits are set to 0 during power-on.
8.3.1 Read-Only Configuration Registers
Note
The S1D13708 returns a value of 34h.
bits 7-2 Product Code
These are read-only bits that indicates the product code. The product code is 001101.
bits 1-0 Revision Code
These are read-only bits that indicates the revision code. The revision code is 00.
bits 7-0 Display Buffer Size Bits [7:0]
This is a read-only register that indicates the size of the SRAM display buffer measured in
4K byte increments. The S1D13708 display buffer is 80K bytes and therefore this register
returns a value of 20 (14h).
Value of this register = display buffer size ÷ 4K bytes
= 80K bytes ÷ 4K bytes
= 20 (14h)
bits 7-0 CNF[7:0] Status
These read-only status bits return the status of the configuration pins CNF[7:0]. CNF[7:0]
are latched at the rising edge of RESET#.
Revision Code Register
REG[00h] Read Only
Product Code Bits 5-0 Revision Code Bits 1-0
76543210
Display Buffer Size Register
REG[01h] Read Only
Display Buffer Size Bits 7-0
76543210
Configuration Readback Register
REG[02h] Read Only
CNF7 Status CNF6 Status
CNF5 Status CNF4 Status CNF3 Status CNF2 Status CNF1 Status CNF0 Status
76543210