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USB to PC Card
Dual Channel Bridge Chip : VMB5000 |  |
| USB Interface for Compact Flash and PCMCIA Designs |
The VMB5000 is a highly integrated PCMCIA / CF device that has been specially
designed for chip-to-chip bridging which is ideal for interfacing to any module
with USB output.
For ultimate flexibility Function 0 includes a unique 2 Port USB host
controller that allows Full Speed (12Mbits/sec) USB target devices to
be bridged via
the VMB5000 to the PCMCIA / CF bus. This unique combination of a USB
host controller on the PCMCIA/CF bus, avoids the need to target 32-bit
Cardbus
cards with their inherently more complex, technically risky and power
hungry interfaces, and which preclude use in PDAs and also prevent the
card from
drawing 5V from the host.
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| Dual Channel for Maximum Flexibility : Also supports UART, SmartCard and Parallel Interface |
| The device offers two separate functions, one aimed at high speed
data streaming and the other aimed at medium speed control and bridging
uses.
Each function can also be configured as a 16550+ UART device with support
for auto flow control and Smart Card modes (T=0/T=1), or as a flexible
serial controller offering support for popular synchronous serial bus
protocols such as SPI, SD™ and 1-Wire™.
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| High Speeds to Support 3G Applications Including
EDGE, UMTS, CDMA Ev-Do and HSDPA |
| The VMB5000 supports both 8 and 16-bit host interface transfers, making
burst data moves at up to 2.6MBytes/sec (>20Mbit/sec) possible. This
opens the way for PCMCIA or CF cards that can support 3rd or 4th Generation
wireless data rates and beyond, even on PDAs.
To sustain such high throughput rates, the VMB5000 offers separate 16KByte
TX and RX FIFOs on Function 0 for use with the UART or USB controller.
Function 0 also supports a parallel access 16550 UART mode, suitable
for use with a micro controller. Function 1 allows bridging to a child
CF module to make Combi card design easy, perfect for WLAN + 3G dual role
cards.
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Dual function single chip PC-Card compliant device, with choice of modes on each function |
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Integrated parallel EEPROM for CIS, re-programmable in-circuit (with software un-lock mechanism) |
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Ultra-thin 64 terminal QFN package, just 9mm x 9mm x 0.9mm
typ., lead-free and halogen free |
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Operates at 3.3V, or 5V using internal LDO (with 5V tolerant
I/Os) |
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Supports PCMCIA *and* Compact Flash interfaces with 8
or 16-bit wide host interface for very high speed |
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Function 0 offers choice of 16550+ UART, Dual port
USB Full Speed Host controller, SmartCard, DIO, and parallel uProcessor
interface modes |
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Function 0 has internal 16Kx8 data FIFO in each direction
to allow efficient data streaming |
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Function 1 offers choice of 16550+ UART, SmartCard, DIO,
and CF Bridging modes |
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Chip can also operate in single function mode (Function
0) with backward compatible features to VPU16551 |
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UARTs are 16550 compatible devices with support for baud
rate multipliers of x1, x4, x8, x32, configurable from CIS data (no device
driver needed) |
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UARTs also support auto RTS/CTS, programmable thresholds
and enhanced data rates, allowing baud rates up to 10Mbit/s |
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ISO7816-3 SmartCard support on both UARTs, with T=0 and
T=1 modes and built-in power sequencing logic |
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USB Host Controller supports 12Mbit/s transfers using
BULK, INTERRUPT, or ISO modes. Built-in root hub allows direct connection
of 2 devices. Controller runs from 24MHz crystal for low power consumption.
Includes PLL and PHY interface to allow “transceiver-less” bridging
if required or can connect to standard 3rd party transceiver chips. Can bridge
to any class of USB 1.1 or USB 2.0 device. |
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DIO modes offer simple software bit-bashing capabilities
but also include hardware acceleration features to make protocols such as
SPI, I2C, SD, MicroWire and 1-Wire protocolsmore efficient and easy to implement.
Max bit rate is up to 10Mbit/sec synchronous serial. |
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Max crystal rate is 40MHz, with support for separate clock
input for Function 1’s UART if required |
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Built-in pull-up and pull-down resistors simplify PCB
layout task |
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Low power consumption, perfect when every milliamp counts |
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