W90220F Winbond Electronics Corp America, W90220F Datasheet - Page 18

• 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.
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- Interlocked handshake, for fast reliable transfer
- Forward "channel-addressing/command transfer" for low-cost peripherals
- Support reverse RLE decompression
- Peer-to-peer capability
Related Pins :
17 pins are allocated for Parallel-Port-Interface including 8-bit data bus, 5 status input signals and 4 control output
signals.
transfering.
path
- nStrobe (output) :
- nAutoFd (output) :
- nInit (output) :
- nSelectIn (output) :
- nAck (input) :
- Busy (input) :
- PError (input) :
Compatible Mode : Set active low to transfer data into peripheral device's input latch
ECP Mode
Compatible Mode : Set low by host to put some printers into auto-line feed mode. May also be used as a ninth
ECP Mode
Compatible Mode : Pulsed low in conjunction with "nSelectIn" active low to reset the interface and force a
ECP Mode
Compatible Mode : Set low by host to select peripheral device.
ECP Mode
Compatible Mode : Pulse low by the peripheral device to acknowledge transfer of a data byte from the host.
ECP Mode
Compatible Mode : Driven high to indicate that the peripheral device is not ready to receive data.
ECP Mode
Compatible Mode : Driven high to indicate that the peripheral device has encountered an error in its paper
ECP Mode
: Used in a closed-loop handshake with "Busy" to transfer data or address information from
: The host drives this signal for flow control in the reverse direction. It is used in an
: This signal is driven low to place the channel in the reverse direction. While in this mode,
: Driven high by host while in ECP mode. Set low by host to terminate ECP mode and
: Used in a close-loop handshake with "nAufoFd" to transfer data during reverse
: The peripheral device uses this signal for flow control in the forward transfering. "Busy"
: Peripherals drive this signal low to acknowledge "nInit". The host relies upon "PError" to
host to peripheral device.
data, parity, or command/data control bit.
interlocked handshake with "nAck". "nAutoFd" also provides a ninth data bit used to
determine whether command or data information is present on the data signals in the
forward transfering.
return to compatible mode idle state.
the peripheral is only allowed to drive the bi-directional data signals when "nInit" is low
and "nSelectIn" is high.
return the link to the compatible mode.
also provides a ninth data bit used to determine whether command or data information is
present on the data signals in the reverse direction.
(ex. paper empty). Peripherals shall set "nFault" low whenever they set "PError" high.
deterine when it is permitted to drive the data signals.
W90220F
Version 0.84