SED1354 Datasheet, PDF (462/472 Pages) Epson Company – Color Graphics LCD/CRT Controller

Page 14
Epson Research and Development
Vancouver Design Center
5 System Design Using the IT8368E PC Card Buffer
If the system designer uses an ITE IT8368E PC Card and multiple-function IO buffer, the
SED1354 can be interfaced with the TX3912 without using a PC Card slot. Instead, the
SED1354 is mapped to a rarely-used 16M byte portion of the PC Card slot buffered by the
IT8368E. This makes the SED1354 virtually transparent to PC Card devices that use the
same slot.
5.1 Hardware Description—Using One IT8368E
The ITE IT8368E has been specifically designed to support EPSON CRT/LCD controllers.
The IT8368E provides eleven Multi-Function IO pins (MFIO). Configuration registers can
be used to allow these MFIO pins to provide the control signals required to implement the
SED1354 CPU interface.
The Toshiba TX3912 processor only provides addresses A[12:0], therefore devices that
occupy more address space must use an external device to latch A[25:13]. The IT8368E’s
MFIO pins can be configured to provide this latched address. However, when using the
SED1354, five MFIO pins are utilized for SED1354 control signals and cannot provide
latched addresses. In this case, an external latch must be used to provide the high-order
address bits. For a solution that does not require a latch, refer to Section 5.2, ‘Hardware
Description—Using Two IT8368E’s”.
SED1354
X19A-G-012-03
Interfacing to the Toshiba MIPS TX3912 Processor
Issue Date: 99/03/10