sed1355 ETC-unknow, sed1355 Datasheet - Page 412
sed1355
Manufacturer Part Number
sed1355
Description
Sed1355 Embedded Ramdac Lcd/crt Controller
Manufacturer
ETC-unknow
Datasheet
1.SED1355.pdf
(509 pages)
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Page 16
4.4 Register/Memory Mapping
SED1355
X23A-G-005-05
CS#
0
0
Note
Table 4-2: Register/Memory Mapping for Typical Implementation
The SED1355 is a memory mapped device. The internal registers require 47 bytes and are
mapped in the lower PC Card memory address space starting at zero.The display buffer
requires 2M bytes and is mapped in the third and fourth megabytes of the PC Card address
space (ranging from 200000h to 3FFFFFh).
A typical implementation as shown in Figure 4-1: “Typical Implementation of PC Card to
SED1355 Interface,” on page 14 has Chip Select (CS#) connected to ground (always
enabled) and the Memory/Register select pin (M/R#) connected to address bit A21. This
provides the following decoding:
The PC Card socket provides 64M byte of address space. Without further resolution on the
decoding logic (M/R# connected to A21), the entire register set is aliased for every 64 byte
boundary within the specified address range above. Since address bits A[25:22] are
ignored, the SED1355 registers and display buffer are aliased 16 times.
If aliasing is not desirable, the upper addresses must be fully decoded.
M/R# (A21)
0
1
20 0000h - 3F FFFFh
Address Range
0 - 1F FFFFh
Internal Register
Display Buffer
Epson Research and Development
Set decoded
Function
decode
Interfacing to the PC Card Bus
Vancouver Design Center
Issue Date: 99/05/05
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