W90221X Winbond Electronics Corp America, W90221X Datasheet - Page 7

• Manufacturer Part Number: W90221X
• Description: Pa-risc Embedded Controller
• Manufacturer: Winbond Electronics Corp America

1 GENERAL DESCRIPTION
The W90221X is a highly integrated 32-bit processor for a wide range of embedded
applications, such as set-top box, web browser and visual/data communication devices. Fig 1-
1 shows a block diagram of the overall system. The W90221X consists of the system support
logics as well as an embedded 32-bit PA-RISC processor.
The 32-bit PA-RISC core has 4K bytes of instruction cache memory, 4K bytes of data cache
memory, a dual-cycle multiply/accumulate module, and integrated functions for interfacing to
numerous system components and external I/O modules. Besides, it’ s designed with a
flexible power management scheme (under software control) and lots of low power circuits to
eliminate the chip's power consumption
The 2-D graphic accelerator is the major mega-functional cell integrated in this chip. This unit
provides directly connect to TV, analog LCD monitor and CRT monitors, intending for low cost
web browser solution. The chip incorporates an ISA-like bus interface (shared with PCI bus
pins) to connect to low speed devices, such as code/data ROM/Flash and traditional ISA-like
or IDE devices. The device also includes a PC100 compliant SDRAM controller, a PCI bridge
supporting up to four PCI masters, a parallel port interface (PPI), two RS-232 type universal
asynchronous serial ports (UART), two timer channels and a flexible synchronous interface
(SSI) connecting to an external audio or telephony CODEC devices. The overall features are
listed in section 2.
Power Mang.
DPCLK
CPUCLK
Unit
6-Stage Integer Pipeline
/2
PLL
(27 Mhz)
Instr. Cache
Data Cache
Branch Table
RAM
RAM
RAM
Internal Bus Interface Unit
Timer (x2)
32-bit CPU Internal Bus
32-bit Internal DMA bus
UART
PCI/AIO
EDO/SDRAM
DMA
Parallel Port
Sync. Serial
GFX
(x2)
Bridge
Controller
Controller
Interface
Port
Controller
PCI/ISA/IDE
Video-in bus
EDO/SDRAM
ROM/Flash
& TV/Mon
Figure 1-1 W90221X Internal Block Diagram
W90221X version 0.6
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