S1D13742 Epson, S1D13742 Datasheet - Page 67

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

Epson Research and Development
Vancouver Design Center
REG[4Eh] bits 3-0
REG[4Ch] bits 7-0
REG[4Ah] bits 7-0
Hardware Functional Specification
Issue Date: 2007/09/18
REG[4Ah] Memory Read Address Register 0
Default = 00h
REG[4Ch] Memory Read Address Register 1
Default = 00h
REG[4Eh] Memory Read Address Register 2
Default = 00h
7
7
7
6
6
6
Note
Note
Memory Read Address bits [19:0]
This register is only used for individual memory location reads.
Individual memory location writes are not supported.
After a completed memory access, this register is incremented automatically.
To perform memory reads:
• perform a register address write to point to this register
• followed by 3 data writes to set-up the memory address
• read the Memory Data Port (REG[48h - 49h])
All write data uses the Memory Data Port and the Window coordinates.
For Intel 80, 16-bit interface, the least significant bit is not used (data is fetched on word
boundaries).
For Intel 80, 8-bit interface, the least significant bit is used (data is fetched on byte
boundaries)
n/a
5
5
5
Revision 6.01 - EPSON CONFIDENTIAL
Memory Address bits 15-8
Memory Address bits 7-0
4
4
4
w
w
w
3
3
3
.
D
a
t
a
S
Memory Address bit 19-16
h
2
2
2
e
e
t
.
c
o
.
1
1
1
k
r
Read/Write
Read/Write
Read/Write
X63A-A-001-06
S1D13742
0
0
0
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D
a
t
a