GMS30C7201 Datasheet, PDF (14/352 Pages) Hynix Semiconductor – 60MHz operation frequency Low power consumption

Introduction
1.1 Introduction
The GMS30C7201 is a high-performance, low-power, single-chip computer optimized for
WinCE applications. It incorporates the ARM720T WinCE-enabled core, which also
incorporates ARM’s novel Thumb code compression mechanism. The GMS30C7201 also
incorporates ARM’s unique Piccolo DSP coprocessor, which gives the GMS30C7201 enough
DSP horse-power to perform software modem functions simultaneously with WinCE operation.
1.1.1 Processor
The ARM720T core incorporates an 8K unified write-through cache, and an 8 data entry, 4
address entry write buffer. It also incorporates an MMU with a 64 entry TLB, and WinCE
enhancements. The Piccolo SP7 core incorporates a 512-byte, instruction-only cache. Piccolo
data is supplied by the ARM720T core, via the coprocessor interface, and hence may be cached
in the ARM720T’s 8K unified cache.
1.1.2 Piccolo
Piccolo is an ARM coprocessor that boosts the performance of the standard ARM720T CPU to
state-of-the-art DSP levels. It integrates:
• DSP-oriented datapath
• associated DSP instruction set
in addition to the standard ARM 32-bit RISC/16-bit Thumb system.
The design/implementation of the Piccolo coprocessor allows data re-use - both the ARM720T
and the coprocessor share the same single system bus. The implementation is therefore cost-
effective and power-efficient. Other advantages of this approach include integrated hardware
and software development. The ARM software development toolkit and emulator support both
the CPU and the coprocessor. The GMS30C7201 will run a V34bis (33k6bps) softmodem.
1.1.3 Video
The GMS30C7201 has direct support for mono and color passive LCD displays, as well as color
TFT LCD displays, with resolution programmable up to 640x480 VGA resolution. In addition,
a separate independent VGA port allows simultaneous display on a VGA resolution monitor, of
either the same image as the LCD, or alternatively an entirely different image. The
GMS30C7201 has on-chip video DACs, allowing the chip to drive a monitor with the minimum
of external circuitry.
1.1.4
Memory and PC-Cards
GMS30C7201 incorporates two separate memory interfaces. A high speed 16-bit wide interface
connects directly to one to four 16, 64 or 128MBit SDRAM devices, supporting DRAM
memory sizes in the range 2 to 64MB. In addition, a separate lower speed 32-bit data path
interfaces to ROM or Flash devices. Burst mode ROMs are supported, for increased
performance, allowing operating system code to be executed directly from ROM. Since the
ROM and SDRAM interfaces are separate, the ARM processor core can access O/S code in
ROM simultaneously with video DMA access to the SDRAM, thus increasing total effective
memory bandwidth, and hence overall performance. In addition, running code directly from
ROM reduces total system cost, since ROM is significantly cheaper on a $/bit basis than
DRAM.
The ROM/Flash interface also allows control of one or two PC-Card interfaces, although in this
case, external buffers and level translators are needed to interface to the card. The
GMS30C7201 generates all signals to control these buffers directly. Since CompactFlash is a
subset of the PC-Card standard, one of the PC-Card slots may be used as a CompactFlash
interface. The PC-Card interface supports the 16-bit slave-only interface, with no DMA
support. It does not support the CardBus 32-bit bus master option in the standard.
1-2
GMS30C7201 Data Sheet