S1D13705 Epson Electronics America, Inc., S1D13705 Datasheet - Page 342
S1D13705
Manufacturer Part Number
S1D13705
Description
S1d13705 Embedded Memory Lcd Controller
Manufacturer
Epson Electronics America, Inc.
Datasheet
1.S1D13705.pdf
(480 pages)
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Page 22
4 Interfacing to the MC68VZ328
4.1 The MC68VZ328 System Bus
4.2 Chip-Select Module
S1D13705
X27A-G-007-04
The MC68VZ328 is Motorola’s third generation Dragonball microprocessor. The Dragon-
ballVZ is an integrated controller for handheld products, based upon the FLX68000 micro-
processor core with an external 24-bit address bus and 16-bit data bus. The DragonballVZ
differs from its predecessor mainly in that it has increased speed, and support for SDRAM
has been added to the DRAM controller. The bus interface consists of all the standard
MC68000 bus interface signals except AS, plus some new signals intended to simplify the
task of interfacing to typical memory and peripheral devices. The 68000 signals are multi-
plexed with IrDA, SPI and LCD controller signals.
The MC68000 bus control signals are well documented in Motorola’s user manuals, and
will not be described here. A brief summary of the new signals appears below:
• Output Enable (OE) is asserted when a read cycle is in process; it is intended to connect
• Upper Write Enable and Lower Write Enable (UWE / LWE) are asserted during
The S1D13705 implements the MC68000 bus interface using its MC68K #1 mode. This
mode may be used to interface the S1D13705 to the DragonballVZ if external logic is used
to generate AS. The Generic #1 interface mode on the S1D13705 is also well suited to
interface to the MC68VZ328.
The MC68VZ328 can generate up to 8 chip select outputs, organized into four groups, “A”
through “D”.
Each chip select group has a common base address register and address mask register, to
set the base address and block size of the entire group. In addition, each chip select within
a group has its own address compare and address mask register, to activate the chip select
for a subset of the group’s address block. Finally, each chip select may be individually
programmed to control an 8 or 16-bit device, and each may be individually programmed to
generate from 0 through 6 wait states internally, or allow the memory or peripheral device
to terminate the cycle externally through use of the standard MC68000 DTACK signal.
Groups A and B are used to control ROM, SRAM, and Flash memory devices and have a
block size of 128K bytes to 16M bytes. Chip select A0 is active immediately after reset and
is a global chip-select so it is typically used to control a boot EPROM device. This chip
select ceases to decode globally once this chip-select’s registers are programmed. Groups
C and D are special in that they can also control DRAM interfaces. These last two groups
have block size of 32K bytes to 4M bytes.
to the output enable control of a typical static RAM, EPROM, or Flash EPROM device.
memory write cycles for the upper and lower bytes of the 16-bit data bus; they may be
directly connected to the write enable inputs of a typical memory device.
Interfacing to the Motorola ‘Dragonball’ Family of Microprocessors
Epson Research and Development
Vancouver Design Center
Issue Date: 01/02/13
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