sed1355 ETC-unknow, sed1355 Datasheet - Page 128

• Manufacturer Part Number: sed1355
• Description: Sed1355 Embedded Ramdac Lcd/crt Controller
• Manufacturer: ETC-unknow

Page 122
bits 7-0
bits 7-0
SED1355
X23A-A-001-11
Ink/Cursor Start Address Select Register
REG[30h]
Ink/Cursor
Start Address
Select
Bit 7
Alternate FRM Register
REG[31h]
Alternate
FRM
Bit 7
Ink/Cursor
Start Address
Select
Bit 6
Alternate
FRM
Bit 6
Ink/Cursor Start Address Bits [7:0]
Ink/Cursor Start Address Select Bits [7:0]
These bits define the start address for the Ink/Cursor buffer. The Ink/Cursor buffer must be posi-
tioned where it does not conflict with the image buffer and half-frame buffer – see Memory Map-
ping for details.
The start address for the Ink/Cursor buffer is programmed as shown in the following table where
Display Buffer Size represents the size in bytes of the attached DRAM device (see MD[7:6] in
Summary of Configuration Options):
The Ink/Cursor image is stored contiguously. The address offset from the starting word of line n to
the starting word of line n+1 is calculated as follows:
Ink Address Offset (words) = REG[04h] + 1
Cursor Address Offset (words) = 8
Alternate Frame Rate Modulation Select
Register that controls the alternate FRM scheme. When all bits are set to zero, the default FRM is
selected. For single passive, or dual passive with the half frame buffer enabled, either the original or
the alternate FRM scheme may be used. The alternate FRM scheme may produce more visually
appealing output. The following table shows the recommended alternate FRM scheme values.
Dual Passive w/Half Frame Buffer Disabled
Dual Passive w/Half Frame Buffer Enabled
Ink/Cursor
Start Address
Select
Bit 5
Alternate
FRM
Bit 5
n = 255...1
0
Table 8-19: Recommended Alternate FRM Scheme
Table 8-18: Ink/Cursor Start Address Encoding
Single Passive
Panel Mode
Ink/Cursor
Start Address
Select
Bit 4
Alternate
FRM
Bit 4
Ink/Cursor
Start Address
Select
Bit 3
Alternate
FRM
Bit 3
Display Buffer Size - (n
Display Buffer Size - 1024
Start Address (Bytes)
0000 0000 or 1111 1111
0000 0000 or 1111 1010
Ink/Cursor
Start Address
Select
Bit 2
Alternate
FRM
Bit 2
Register Value
1111 1111
Epson Research and Development
Ink/Cursor
Start Address
Select
Bit 1
Alternate
FRM
Bit 1
Hardware Functional Specification
8192)
Vancouver Design Center
Issue Date: 99/05/18
Ink/Cursor
Start Address
Select
Bit 0
Alternate
FRM
Bit 0
RW
RW