W83627UHG Nuvoton Technology Corporation of America, W83627UHG Datasheet - Page 134

• Manufacturer Part Number: W83627UHG
• Description: IC I/O CONTROLLER 128-QFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627UHG

• Applications: PC's, PDA's
• Interface: LPC
• Voltage - Supply: 3.3V, 5V
• Package / Case: 128-XFQFN
• Mounting Type: Surface Mount
• Pin Count: 128
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

11.2.7.2
The EPP read/write cycle can start without checking whether nWait is active or inactive. Once the
read/write cycle starts, however, it does not finish until nWait changes from active low to inactive high.
11.3 Extended Capabilities Parallel (ECP) Port
This port is software- and hardware-compatible with existing parallel ports, so the W83627UHG
parallel port may be used in standard printer mode if ECP is not required. It provides an automatic
high burst-bandwidth channel that supports DMA for ECP in both the forward (host-to-peripheral) and
reverse (peripheral-to-host) directions.
Small FIFOs are used in both forward and reverse directions to improve the maximum bandwidth
requirement. The size of the FIFO is 16 bytes. The ECP port supports an automatic handshake for the
standard parallel port to improve compatibility mode transfer speed.
The ECP port hardware supports run-length-encoded (RLE) decompression.
Compression is accomplished by counting identical bytes and transmitting an RLE byte that indicates
how many times the next byte is to be repeated. RLE compression is required; the hardware support
is optional.
For more information about the ECP Protocol, refer to the Extended Capabilities Port Protocol and ISA
Interface Standard.
The W83627UHG ECP supports the following modes.
The mode selection bits are bits 7-5 of the Extended Control Register.
MODE
000
001
010
011
100
101
110
111
EPP Version 1.7 Operation
SPP mode
PS/2 Parallel Port mode
Parallel Port Data FIFO mode
ECP Parallel Port mode
EPP mode (If this option is enabled in the CRF0h to select ECP/EPP mode)
Reserved
Test mode
Configuration mode
Table 11-4 ECP Mode Description
DESCRIPTION
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Publication Release Date: May 25, 2007
W83627UHG
Revision 1.0