NCT6627UD Nuvoton Technology Corporation of America, NCT6627UD Datasheet - Page 140

• Manufacturer Part Number: NCT6627UD
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of NCT6627UD

• Lead Free Status / Rohs Status: Supplier Unconfirmed

This mode is defined only for the forward direction. Bytes written or DMAed to this FIFO are transmitted by a
hardware handshake to the peripheral using the standard parallel port protocol. Transfers to the FIFO are byte-
aligned.
When the direction bit is 0, bytes written or DMAed to this FIFO are transmitted by a hardware handshake to the
peripheral using the ECP parallel port protocol. Transfers to the FIFO are byte-aligned.
When the direction bit is 1, data bytes from the peripheral are read via automatic hardware handshake from ECP
into this FIFO. Reads or DMAs from the FIFO return bytes of ECP data to the system.
Data bytes may be read, written, or DMAed to or from the system to this FIFO in any direction. Data in the tFIFO
is not transmitted to the parallel port lines. However, data in the tFIFO may be displayed on the parallel port data
lines.
This register is a read-only register. When it is read, 10H is returned. This indicates that this is an 8-bit
implementation.
BIT
7-6
11.3.5
11.3.6
11.3.7
11.3.8
5
4
3
2
1
0
These two bits are always read as logical 1 and cannot be written.
Director. If the mode is 000 or 010, this bit has no effect and the direction is always out.
In other modes,
0: The parallel port is in the output mode.
1: The parallel port is in the input mode.
ackInEn (Interrupt Request Enable). When this bit is set to logical 1, it enables interrupt
requests from the parallel port to the CPU on the low-to-high transition on ACK#.
SelectIn. This bit is inverted and output to the SLIN# output.
0: The printer is not selected.
1: The printer is selected.
nInit. This bit is output to the INIT# output.
Autofd. This bit is inverted and output to the AFD# output.
Strobe. This bit is inverted and output to the STB# output.
CFIFO (Parallel Port Data FIFO) Mode = 010
ECPDFIFO (ECP Data FIFO) Mode = 011
TFIFO (Test FIFO Mode) Mode = 110
CNFGA (Configuration Register A) Mode = 111
DESCRIPTION
-131-
W83627UHG/NCT6627UD
Publication Release Date: October 26, 2010
Revision 1.7