Rev. 3.0, 03/01, page 177 of 390
(5) Parallel Port Data FIFO (cFifo) (Address H'1000A010, Mode 010)
Bytes written to this FIFO are sent by a hardware handshake to the peripheral according to the
standard parallel port protocol. This operation is only defined for the forward direction.
(6) ECP Data FIFO (ecpDFifo) (Address H'1000A010, Mode 011)
When the direction bit dcr(5) is “0”, bytes written to this FIFO are sent by a hardware handshaking
to the peripheral according to the ECP parallel port protocol. When the dcr(5) is “1”, data bytes
from the peripheral to this FIFO are read in an automatic hardware handshaking. The host can
acquire these bytes by performing READ operations.
(7) Test FIFO mode (tFifo) (Address H'1000A010, Mode 110)
The host may operate READ/WRITE transfer to this FIFO in any direction. Data in this FIFO will
be displayed on the PD bus without using hardware protocol handshaking. The tFifo will not
accept new data after it is full. Performing a READ from an empty fFifo causes the last data byte
to return.
(8) Configuration Register A (cnfgA) (Address H'1000A010, Mode 111)
This register is a read only register. When read, the returned data is valued at 10h, it indicates to
the system that this is an 8-bit implementation. (Pword = 1byte)
(9) Configuration Register B (cnfgB) (Address H'1000A012, Mode 111)
Address: H'1000A012, Mode 111
Bit
7
6
5
4
3
2
1
0
Bit Name
Compress Reserved Reserved Reserved Reserved Reserved Reserved Reserved
Initial Value
0
0
0
0
0
0
0
0
R/W
R
R
R
R
R
R
R
R
Bit
Description
Default
7
Compress: This bit is read only. It is in a low level during a READ operation. This means
that this controller does not support hardware RLE compression. It does support hardware
de-compression!
0
6
Reserved.
1
5 - 0
Reserved: These bits are ‘0’s during a READ operation.
3Fh
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