Rev. 3.0, 03/01, page 176 of 390
(2) ECP Address FIFO Register (ecpAFifo)
Any data byte written to this port is placed in the FIFO and tagged as an ECP Address/RLE. The
hardware then sends this data automatically to the peripheral. The operation of this port is only
valid in forward direction (dcr(5)=0).
(3) Device Status Register (dsr) (Address H'1000A002, Mode All)
Address: H'1000A002, Mode All
Bit
7
6
5
4
3
2
1
0
Bit Name
nBusy
nAck
PError
Select
nFault
Reserved Reserved Reserved
Initial Value
0
1
1
1
1
1
1
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit
Description
Default
7
nBusy : Inverse of the Busy input pin
0
6
nAck : The state of the nAck input pin.
1
5
PError: The state of the PError input pin.
1
4
Select: The state of the Select input pin.
1
3
nFault : The state of the nFault input pin.
1
2 - 0
Reserved: These bits are always “1”.
111
(4) Device Control Register (dcr) (Address H'1000A004, Mode All)
Address: H'1000A004, Mode All
Bit
7
6
5
4
3
2
1
0
Bit Name
Reserved Reserved PDDIR
IRQE
SelectIn
nlnit
AutoFd
Strobe
Initial Value
1
1
0
0
-
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit
Description
Default
7, 6
Reserved: These bits are always “1”.
11
5
PDDIR: Except in modes 000 and 010, setting this bit low means that the PD bus is in
output operation; setting it high, in input operation. This bit will be forced low in mode 000.
0
4
IRQE: Setting this bit high enables interrupt request from peripheral to host due to a rising
edge of the nAck input.
0
3
SelectIn: It is inverted and output to the pin nSelectIn.
-
2
Ninit: It is output to the pin nInit without inversion.
0
1
AutoFd: It is inverted and output to the pin nAutoFd.
0
0
Strobe: It is inverted and output to the pin nStrobe.
0
Summary of Contents for HD64465
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