GL640USB datasheet(31/39 Pages) ETC

31 / 39 page

Revision 1.1

Jun. 7, 1999

-30-

GL640USB, GL640USB-A

9.. Advantages of GL640USB

Advantage

Description

EMI consideration

1. Operates at 12MHz frequency to reduce EMI radiation

2. Slew rate controlled output pads:

All the transition on output pads are well controlled to reduce the EMI radiation.

Cost Saving

1. Provide clock output, no other crystal required. The clock frequency can be 24, 16, 12,

8, 6 MHz

2. Build in power-on reset circuit. No reset circuit required.

3. Provide 3.3V output to pull-up USB bus

Flexibility

Provide self-Isolation capability. With this capability, a device can be designed to

support both EPP and USB interface.

Provide additional 7 GPIO pins and 4 GPI pins. These pins can be used as testing

purpose, status indication, product selection, … and so on.

Customized firmware: Contains a RISC controller with 2K ROM, user can

developing its own firmware to achieve best performance and satisfy special

applications

Support 93C46 to provide external VID and PID

Performance

1. Build in hardware EPP engine and 2 sets of 64 byte ping-pong FIFO, the performance

for Bulk transfer will be up to 1.1 Mbytes /sec

2. Balanced architecture: Both the Bulk-In and Bulk-Out can achieve 1.1 Mbytes/sec

transfer rate.

GL640USB Fiches technique(PDF) 31 Page - List of Unclassifed Manufacturers