W83627EHG Nuvoton Technology Corporation of America, W83627EHG Datasheet - Page 184

• Manufacturer Part Number: W83627EHG
• Description: IC I/O CONTROLLER 128-QFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627EHG

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

ECP address/RLE bytes or data bytes may be sent automatically by writing the ecpAFifo or ecpDFifo,
respectively.
The software must handle P1284 negotiation and all operations prior to a data transfer in SPP or PS/2
modes (000 or 001). The hardware provides an automatic control line handshake, moving data
between the FIFO and the ECP port, only in the data transfer phase (mode 011 or 010).
If the port is in mode 000 or 001, it may switch to any other mode. If the port is not in mode 000 or 001,
it can only be switched into mode 000 or 001. The direction can only be changed in mode 001.
In extended forward mode, the software should wait for the FIFO to be empty before switching back to
mode 000 or 001. In ECP reverse mode, the software should wait for all the data to be read from the
FIFO before changing back to mode 000 or 001.
ECP mode allows the transfer of normal 8-bit data or 8-bit commands. In the forward direction, normal
data are transferred when HostAck is high, and an 8-bit command is transferred when HostAck is low.
The most significant bits of the command indicate whether it is a run-length count (for compression) or
a channel address.
In the reverse direction, normal data are transferred when PeriphAck is high, and an 8-bit command is
transferred when PeriphAck is low. The most significant bit of the command is always zero.
The W83627EHF/EHG/EF/EG hardware supports RLE decompression and can transfer compressed
data to a peripheral. Odd (RLE) compression is not supported in the hardware, however. In order to
transfer data in ECP mode, the compression count is written to ecpAFifo and the data byte is written to
ecpDFifo.
10.3.13 FIFO Operation
10.3.12.1. Mode Switching
10.3.12.2. Command/Data
10.3.12.3. Data Compression
(b) Set strobe = 0, causing the nStrobe signal to default to the deasserted state.
(c) Set autoFd = 0, causing the nAutoFd signal to default to the deasserted state.
(d) Set mode = 011 (ECP Mode)
W83627EHF/EF, W83627EHG/EG
-173-
Publication Release Date: April 7, 2009
Version 1.94