Lucent Technologies MN10285K - Manual (Page 170)

On-Screen Display
VRAM
MN102H75K/F75K/85K/F85K LSI User Manual Panasonic Semiconductor Development Company
169
Panasonic
7.8.2 VRAM Organization
Notes: 1. All addresses are expressed in hex notation. Other values are decimal.
2. GRAMEND: Graphics RAM end address (programmable to any address)
3. CRAMEND: Text RAM end address (programmable to any address)
4. M: Number of lines in the text layer
5. m: 1 and up
6. N: Number of lines in the graphics layer
7. n: 1 and up
Figure 7-6 VRAM Organization (When GEXTE = 0)
GRAMEND − 3F
GRAMEND − 3E
GRAMEND − 3D
GRAMEND − 3C
GRAMEND − 3B
GRAMEND − 3A
GRAMEND − 2F
GRAMEND − 2E
GRAMEND − 3
GRAMEND − 2
GRAMEND − 1
GRAMEND
Unused area
Unused area
Code 30
Code 29
.
.
.
Code 2
Code 1 2 bytes
Low-order 8 bits
of graphics code
High-order 8 bits
of graphics code
GRAMEND − 40 × N + 5
GRAMEND − 40 × (N − 1)
GRAMEND − 40 × n + 5
GRAMEND − 40 × (n − 1)
GRAMEND − 7B
GRAMEND − 40
GRAMEND − 3B
GRAMEND
Line N data
.
.
.
Line n data
.
.
.
Line 2 data
Line 1 data 64 bytes
Graphics RAM Addresses
(When GEXTE = 1)
CRAMEND − 4F
CRAMEND − 4E
CRAMEND − 4D
CRAMEND − 4C
CRAMEND − 4B
CRAMEND − 4A
CRAMEND − 3
CRAMEND − 2
CRAMEND − 1
CRAMEND
Code 40
Code 39
Code 38
.
.
.
Code 2
Code 1 2 bytes
Low-order 8 bits
of text code
High-order 8 bits
of text code
CRAMEND − 50 × M + 1
CRAMEND − 50 × (M − 1)
CRAMEND − 50 × m + 1
CRAMEND − 50 × (m − 1)
CRAMEND − 9F
CRAMEND − 50
CRAMEND − 4F
CRAMEND
Line M data
.
.
.
Line m data
.
.
.
Line 2 data
Line 1 data
80 bytes
Text RAM Addresses
GRAMEND − 40 × N + 5
GRAMEND
CRAMEND − 50 × M + 1
CRAMEND
Program
Data
and
Stack
Area
Graphics
VRAM
Text
VRAM
x'009FFF'
x'008000'