W90220F Winbond Electronics Corp America, W90220F Datasheet - Page 49

• Manufacturer Part Number: W90220F
• Description: Pa-risc Embedded Controller
• Manufacturer: Winbond Electronics Corp America

The above information is the exclusive intellectual property of Winbond Electroncs Corp. and shall not be dsiclosed or distributed or reproduced without permission from
Winbond.
49
Bit 7
This read-only register reflects the inputs on the Parallel Port Interface and some of device data
FIFO and Command Register status.
Device Control Register (DCR)
Port address : 0xf000037a
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
This register directly controls several output signals as well as enabling some functions. The power-
on default "0x0" makes {nSelectIn, nInit, nAutoFd, nStrobe} in {high, low, high, high} state, and
0
Reserved
"Command" pended
Data bus output enable
This bit has no effects during "peripheral emulation mode", "standard mode",
"fast standard mode" and "PS2 mode".
nACK interrupt enable
When this bit is set. A low-to-high transition will generate a interrupt request to CPU core.
Complement version of Parallel Port Interface "nSelectIn" signal
Version of Parallel Port Interface "nInit" signal
Complement version of Parallel Port Interface "nAutoFd" signal
Complement version of Parallel Port Interface "nStrobe" signal
0 = Command Register (CMD) contains no command code
1 = A command code is in CMD not been transfered yet
0 = Data bus is drived by PPI for forward transfering
1 = Data bus is drived by peripheral device for reverse transfering
0 = Data bus is drived by PPI for forward transfering
1 = Data bus is drived by peripheral device for reverse transfering
1
DOE
2
Read/write
nAck_Ien nSELIN#
3
4
Power-on Default : 0x0
nINIT
5
nAUFD#
6
nSTB#
7
W90220F
Version 0.84