S1D13505 Epson Electronics America, Inc., S1D13505 Datasheet - Page 128

• Manufacturer Part Number: S1D13505
• Description: LCD Controller
• Manufacturer: Epson Electronics America, Inc.

Page 122
9 Display Buffer
S1D13505
X23A-A-001-14
CS#
0
0
1
512K Byte Buffer
Half-Frame Buffer
Half-Frame Buffer
Half-Frame Buffer
Half-Frame Buffer
The system addresses the display buffer through the CS#, M/R#, and AB[20:0] input pins. When
CS# = 0 and M/R# = 1, the display buffer is addressed by bits AB[20:0]. See the table below:
The display buffer address space is always 2M bytes. However, the physical display buffer may be
either 512K bytes or 2M bytes – see “Summary of Configuration Options”.
The display buffer can contain an image buffer, one or more Ink/Cursor buffers, and a half-frame
buffer.
A 512K byte display buffer is replicated in the 2M byte address space – see the figure below.
Ink/Cursor Buffer
Ink/Cursor Buffer
Ink/Cursor Buffer
Ink/Cursor Buffer
Image Buffer
Image Buffer
Image Buffer
Image Buffer
M/R#
X
0
1
Figure 9-1: Display Buffer Addressing
Table 9-1: S1D13505 Addressing
Register access:
• REG[00h] is addressed when AB[5:0] = 0
• REG[01h] is addressed when AB[5:0] = 1
• REG[n] is addressed when AB[5:0] = n
Memory access: the 2M byte display buffer is addressed by
AB[20:0]
S1D13505 not selected
AB[20:0]
17FFFFh
000000h
07FFFFh
080000h
0FFFFFh
100000h
180000h
1FFFFFh
Access
Half-Frame Buffer
Ink/Cursor Buffer
2M Byte Buffer
Image Buffer
Epson Research and Development
Hardware Functional Specification
Vancouver Design Center
Issue Date: 01/02/02