at7601fg AME, Inc., at7601fg Datasheet - Page 11

• Manufacturer Part Number: at7601fg
• Description: Printer Port Controller
• Manufacturer: AME, Inc.

Rev. B.02
AT7601F
Pin Name
PD [7:0]
PError
Fault#
ACK#
SLIN#
STB#
SLCT
AFD#
Busy
INIT#
AME, Inc.
ECP Mode Name
AckReverse#
ReverseReq#
PeriphReq#
PeriphAck
ECPMode
PeriphClk
HostAck
HostClk
D0-D7
Xflag
I/O Type
Table 8. ECP Pin Descriptions
I/O
O
O
O
O
I
I
I
I
I
During write operations STB# registers data or address
into the slave on the asserting edge. These signal
handshakes with Busy.
These signals contain address or data or RLE data.
This signal indicates valid data driven by the peripheral when
asserted. This signal handshakes with AFD# in reverse.
This signal deasserts to indicate that the peripheral can
accept data. It indicates whether the data lines contain
ECP command information or data in the reverse
direction. When in reverse direction, normal data are
transferred when Busy (PeriphAck) is high and an 8-bit
command is transferred when it is low.
This signal is used to acknowledge a change in the direction
of the transfer (asserted = forward). The peripheral drives
this signal low to acknowledge ReverseReq#. The host
relies upon AckReverse# to determine when it is permitted to
drive the data bus.
Indicates printer on line.
Requests a byte of data from the peripheral when it is
asserted. This signal indicates whether the data lines
contain ECP address or data in the forward direction.
When in forward direction, normal data are transferred when
AFD# (HostAck) is high and an 8-bit command is
transferred when it is low.
Generates an error interrupt when it is asserted. This
signal is valid only in the forward direction. The peripheral
is permitted (but not required) to drive this pin low to
request a reverse transfer during ECP Mode.
This signal sets the transfer direction (asserted = reverse,
deasserted = forward). This pin is driven low to place the
channel in the reverse direction.
This signal is always deasserted in ECP mode.
Description
Printer Port Controller
11